Engine cooling system providing mixed or unmixed head and block cooling
First Claim
1. For an internal combustion engine comprising:
- (a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet;
(b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and
(c) a radiator formed with an inlet and an outlet;
a cooling system, comprising;
(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet;
(e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet;
(f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature;
(g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof;
(h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator;
(i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket;
(j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal;
(k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system;
(l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and
(m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve.
1 Assignment
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Accused Products
Abstract
An internal combustion engine includes a cylinder head and a cylinder block, and is provided with a radiator. Cooling jackets are formed in the head and in the block, and separate pumps drive cooling fluid through these jackets. A sensor senses the temperature of the cooling fluid passing out from the block cooling jacket, and a controller receives a signal from this sensor. A block recirculation conduit system of high flow resistance leads from the block cooling jacket outlet to its inlet, bypassing the radiator. A main recirculation conduit system communicates at its upstream end to the outlets of both the cooling jackets, and at its downstream portion to the radiator. A radiator output conduit system leads from the radiator to the inlets of both the cooling jacket. A first control valve, controlled by the controller, controls flow through the radiator. A radiator bypass conduit system of high flow resistance leads from a downstream part of the main recirculation conduit system to the inlets of both cooling jackets, and operation of the first control valve does not cut off flow through this bypass conduit system. A second control valve controls flow from the radiator output conduit system and the radiator bypass conduit system to the block cooling jacket inlet, and is controlled by the controller.
103 Citations
60 Claims
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1. For an internal combustion engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet; a cooling system, comprising; (d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for operating a cooling system for an internal combustion engine, said engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet;
a cooling system comprising;(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve, when said cooling system is filled with cooling fluid, comprising the processes, simultaneously performed, of; (n) operating said first pump and said second pump; and (o) depending upon said sensed block output temperature signal from said block output fluid temperature sensor, performing either one or the other but not both of the following two processes (p) and (q); (p) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of less than a certain first predetermined temperature value, then simultaneously; (p1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as substantially to interrupt flow of cooling fluid through said radiator; and (p2) controlling said second control valve, by said block flow regulation signal, so as to allow a flow of cooling fluid through said radiator bypass conduit system from a downstream part of said main recirculation conduit system to said cylinder block inlet of said block cooling jacket; (q) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of greater than said first predetermined temperature value, then simultaneously; (q1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as to allow cooling fluid to flow through said radiator; and (q2) controlling said second control valve, by said block flow regulation signal, so as to allow a controlled flow of cooling fluid from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A method for operating a cooling system for an internal combustion engine, said engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet;
a cooling system comprising;(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve and a head output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder head outlet of said head cooling jacket, and for generating a sensed head output temperature signal representative of said temperature, said sensed head output temperature signal being supplied to said controller, when said cooling system is filled with cooling fluid, comprising the processes, simultaneously performed, of; (n) operating said first pump and said second pump; and (o) depending upon said sensed block output temperature signal from said block output fluid temperature sensor, performing either one or the other but not both of the following two processes (p) and (q); (p) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of less than a certain first predetermined temperature value, then simultaneously; (p1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as substantially to interrupt flow of cooling fluid through said radiator; and (p2) controlling said second control valve, by said block flow regulation signal, so as to allow a flow of cooling fluid through said radiator bypass conduit system from a downstream part of said main recirculation conduit system to said cylinder block inlet of said block cooling jacket; (q) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of greater than said first predetermined temperature value, then simultaneously; (q1) selectively controlling said first control valve, by said radiator flow regulation signal from said controller, according to said sensed head output temperature signal received from said head output fluid temperature sensor by said controller, so as selectively to allow cooling fluid to flow through said radiator in such a way as to maintain the temperature indicated by said sensed head output temperature signal substantially at a third predetermined temperature value; and (q2) controlling said second control valve, by said block flow regulation signal, so as to allow a controlled flow of cooling fluid from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket.
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55. A method for operating a cooling system for an internal combustion engine, said engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet;
a cooling system comprising;(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve and a head output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder head outlet of said head cooling jacket, and for generating a sensed head output temperature signal representative of said temperature, said sensed head output temperature signal being supplied to said controller, when said cooling system is filled with cooling fluid, comprising the processes simultaneously performed, of; (n) operating said first pump and said second pump; and (o) if said sensed head output temperature signal from said head output fluid temperature sensor indicates a cooling fluid temperature at said cylinder head outlet of said head cooling jacket of less than a certain fourth predetermined temperature value, then simultaneously; (o1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as substantially to interrupt flow of cooling fluid through said radiator; and (o2) controlling said second control valve, by said block flow regulation signal, so as substantially to interrupt flow of cooling fluid through said radiator bypass conduit system from said main recirculation conduit system to said cylinder block inlet of said block cooling jacket. - View Dependent Claims (56)
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57. A method for operating a cooling system for an internal combustion engine, said engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet;
a cooling system comprising;(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve, (n) an engine rotational speed sensor for detecting the rotational speed of a component of said internal combustion engine and for producing an engine rotational speed sensor signal representative thereof, said engine rotational speed sensor signal being supplied to said controller, and (o) an engine load sensor for detecting the load on said internal combustion engine and for producing an engine load sensor signal representative thereof, said engine load sensor signal being supplied to said controller, said cooling system further comprising a head output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder head outlet of said head cooling jacket, and for generating a sensed head output temperature signal representative of said temperature and feeding said sensed head output temperature signal to said controller, said cooling system being filled with cooling fluid, comprising the processes, simultaneously performed, of; (p) operating said first pump and said second pump; and (q) depending upon said sensed block output temperature signal from said block output fluid temperature sensor, performing either one or the other but not both of the following two processes (r) and (s); (r) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of less than a certain first predetermined temperature value, then simultaneously; (r1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as substantially to interrupt flow of cooling fluid through said radiator; and (r2) controlling said second control valve, by said block flow regulation signal, so as to allow a flow of cooling fluid thorugh said radiator bypass conduit system from a downstream part of said main recirculation conduit system to said cylinder block inlet of said block cooling jacket; (s) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of greater than said first predetermined temperature value, then; (s1) if said engine rotational speed sensor is producing an engine rotational speed sensor signal representative of high engine rotational speed and at the same time said engine load sensor is producing an engine load sensor signal indicative of high engine load, then simultaneously; (t1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as to allow cooling fluid to flow through said radiator in the maximum amount; and (t2) controlling said second control valve, by said block flow regulation signal, so as to allow a controlled flow of cooling fluid from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket; (s2) and if said engine load sensor is producing an engine load sensor signal which is not indicative of high engine load, then simultaneously; (u1) selectively controlling said first control valve, by said radiator flow regulation signal from said controller, according to said sensed head output temperature signal, so as selectively to allow cooling fluid to flow through said radiator in an amount which is appropriate to maintain the temperature indicated by said sensed head output temperature signal from said head output fluid temperature sensor at approximately a sixth predetermined temperature; and (u2) controlling said second control valve, by said block flow regulation signal, so as to allow a controlled flow of cooling fluid from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket. - View Dependent Claims (58, 59)
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60. A method for operating a cooling system for an internal combustion engine, said engine comprising:
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(a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet;
a cooling system comprising;(d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block output fluid temperature sensor for sensing the temperature of the cooling fluid which passes out through said cylinder block outlet of said block cooling jacket, and for generating a sensed block output temperature signal representative of said temperature; (g) a block recirculation conduit system of relatively high flow resistance, leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid to said cylinder block inlet thereof; (h) a main recirculation conduit system, an upstream part of which is communicated both to said cylinder head outlet of said head cooling jacket and also to said cylinder block outlet of said block cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (i) a radiator output conduit system, leading from said outlet of said radiator both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket; (j) a first control valve for controlling flow of cooling fluid through said radiator according to a radiator flow regulation signal; (k) a radiator bypass conduit system, of relatively high flow resistance, which leads from a downstream part of said main recirculation conduit system both to said cylinder head inlet of said head cooling jacket and also to said cylinder block inlet of said block cooling jacket, operation of said first control valve so as to cut off said flow of cooling fluid through said radiator not cutting off flow of cooling fluid through said radiator bypass conduit system; (l) a second control valve for controlling flow of cooling fluid from said radiator output conduit system and said radiator bypass conduit system to said cylinder block inlet of said block cooling jacket according to a block flow regulation signal; and (m) a controller, which receives said sensed block output temperature signal from said block output fluid temperature sensor, and which produces, based thereon, said radiator flow regulation signal which is sent to said first control valve, and also said block flow regulation signal which is sent to said second control valve, and an engine lubricating oil temperature sensor for detecting the temperature of lubricating oil contained within said cylinder block, and for producing a lubricating oil temperature signal representative thereof, said lubricating oil temperature signal being supplied to said controller, when said cooling system is filled with cooling fluid, comprising the processes, simultaneously performed, of; (n) operating said first pump and said second pump; and (o) depending upon said sensed block output temperature signal from said block output fluid temperature sensor, performing either one or the other but not both of the following two processes (p) and (q); (p) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of less than a certain first predetermined temperature value, then simultaneously; (p1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as substantially to interrupt flow of cooling fluid through said radiator; and (p2) controlling said second control valve, by said block flow regulation signal, so as to allow a flow of cooling fluid through said radiator bypass conduit system from a downstream part of said main recirculation conduit system to said cylinder block inlet of said block cooling jacket; (q) if said sensed block output temperature signal from said block output fluid temperature sensor indicates a cooling fluid temperature at said cylinder block outlet of said block cooling jacket of greater than said first predetermined temperature value, then, depending upon said lubricating oil temperature signal from said engine lubricating oil temperature sensor, performing either one or the other but not both of the following two processes (q1) and (q2); (q1) if said lubricating oil temperature signal from said engine lubricating oil temperature sensor indicates an engine lubricating oil temperature of less than a second predetermined temperature value, then simultaneously; (r1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as to allow such a flow of cooling fluid through said radiator as to keep the temperature indicated by said sensed block output temperature signal from said block output fluid temperature snesor substantially at said first predetermined temperature value; and (r2) controlling said second control valve, by said block flow regulation signal, so as to allow a flow of cooling fluid from a downstream part of said radiator bypass conduit system and from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket; (q2) if said lubricating oil temperature signal from said engine lubricating oil temperature sensor indicates an engine lubricating oil temperature of greater than said second predetermined temperature value, then simultaneously; (s1) controlling said first control valve, by said radiator flow regulation signal from said controller, so as to allow cooling fluid to flow through said radiator in substantially the maximum amount; and (s2) controlling said second control valve, by said block flow regulation system, so as to allow such a controlled amount of flow of cooling fluid from said radiator and said radiator output conduit system to said cylinder block inlet of said block cooling jacket, as to keep said temperature value indicated by said lubricating oil temperature signal from said engine lubricating oil temperature sensor at substantially a third predetermined temperature value which is substantially higher than said second temperature value.
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Specification