Cooling system for water-cooled internal combustion engine and control method applicable to cooling system therefor
First Claim
1. A cooling system for a water-cooled internal combustion engine, comprising:
- a heat exchanger to circulate a coolant flowing out from the water-cooled engine into tubes arranged in a space between headers thereof to cool the coolant;
a pump driven independently of the water-cooled engine to circulate the coolant into the water-cooled engine and the heat exchanger;
a temperature detector to detect a temperature of the coolant;
a controller that drivingly controls the pump on the basis of a detected value of the coolant temperature by the temperature detector in such a manner as to control the drive of the pump for the coolant to be circulated by a predetermined flow quantity, when the temperature of the coolant detected by the temperature detector indicates a value higher than a predetermined target temperature, the heat exchanger being arranged, at the predetermined flow quantity of the coolant, to cause a stream state of the coolant circulated within the tubes of the heat exchanger to fall within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range, wherein the heat exchanger is arranged, at the predetermined flow quantity of the coolant, to cause the stream state of the coolant circulated within the tubes of the heat exchanger to fall within a range of 1800 through 6000 in Reynolds number;
a fan that develops an air flow amount supplied to the tubes of the heat exchanger; and
a fan motor that drives the fan to rotate so as to develop the air flow amount supplied to the tubes and so as to provide a predetermined air flow quantity for the tubes of the heat exchanger in response to a drive control signal output by the controller on the basis of the detected temperature of the coolant by the temperature detector, wherein the temperature detector detects the coolant temperature at a cylinder block coolant passage through which a cylinder block of the water-cooled engine is cooled, and wherein the controller drivingly controls the pump and the fan motor of the fan so that the Reynolds number falls in the range of 1800 through 6000 when the temperature of the coolant detected by the temperature detector indicates the value higher than the predetermined target temperature.
1 Assignment
0 Petitions
Accused Products
Abstract
In a cooling system for a water-cooled internal combustion engine and a control method applicable to the control system, a pump to circulate a coolant to the water-cooled engine and a heat exchanger is drivingly controlled in such a manner that, when a temperature of the coolant detected by a temperature detector indicates a value higher than a predetermined target temperature, a flow state of the coolant circulated within a plurality of tubes arranged within the heat exchanger falls within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range (corresponding to 1800 through 6000 in Reynolds number) and the coolant is circulated through the pump into the water-cooled engine and the heat exchanger by a predetermined flow quantity.
-
Citations
11 Claims
-
1. A cooling system for a water-cooled internal combustion engine, comprising:
-
a heat exchanger to circulate a coolant flowing out from the water-cooled engine into tubes arranged in a space between headers thereof to cool the coolant;
a pump driven independently of the water-cooled engine to circulate the coolant into the water-cooled engine and the heat exchanger;
a temperature detector to detect a temperature of the coolant;
a controller that drivingly controls the pump on the basis of a detected value of the coolant temperature by the temperature detector in such a manner as to control the drive of the pump for the coolant to be circulated by a predetermined flow quantity, when the temperature of the coolant detected by the temperature detector indicates a value higher than a predetermined target temperature, the heat exchanger being arranged, at the predetermined flow quantity of the coolant, to cause a stream state of the coolant circulated within the tubes of the heat exchanger to fall within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range, wherein the heat exchanger is arranged, at the predetermined flow quantity of the coolant, to cause the stream state of the coolant circulated within the tubes of the heat exchanger to fall within a range of 1800 through 6000 in Reynolds number;
a fan that develops an air flow amount supplied to the tubes of the heat exchanger; and
a fan motor that drives the fan to rotate so as to develop the air flow amount supplied to the tubes and so as to provide a predetermined air flow quantity for the tubes of the heat exchanger in response to a drive control signal output by the controller on the basis of the detected temperature of the coolant by the temperature detector, wherein the temperature detector detects the coolant temperature at a cylinder block coolant passage through which a cylinder block of the water-cooled engine is cooled, and wherein the controller drivingly controls the pump and the fan motor of the fan so that the Reynolds number falls in the range of 1800 through 6000 when the temperature of the coolant detected by the temperature detector indicates the value higher than the predetermined target temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A control method applicable to a control system for a water-cooled internal combustion engine, the control system comprising:
-
a heat exchanger to circulate a coolant flowing out from the water-cooled engine into tubes arranged in a space between headers thereof to cool the coolant;
a pump driven independently of the water-cooled engine to circulate the coolant to the water-cooled engine and the heat exchanger; and
a temperature detector to detect a temperature of the coolant, the control method comprising;
determining whether the temperature of the coolant detected by the temperature detector indicates a value higher than a predetermined target temperature;
drivingly controlling the pump on the basis of a detected value of the coolant temperature by the temperature detector in such a manner as to control the drive of the pump for the coolant to be circulated by a predetermined flow quantity, when determining that the temperature of the coolant detected by the temperature detector indicates a value higher than a predetermined target temperature, at the predetermined flow quantity of the coolant;
causing a stream state of the coolant circulated within the tubes of the heat exchanger to fall within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range;
controlling a rotation speed of a motor of a fan for the heat exchanger to provide a predetermined air flow amount on the basis of the temperature of the coolant detected by the temperature sensor, wherein the predetermined range within which the flow state of the coolant circulated within the tubes of the heat exchanger falls corresponds to a range of 1800 to 6000 in Reynolds number of the coolant circulated into the tubes of the heat exchanger;
determining whether the fan motor is being operated when the temperature of the coolant detected by the temperature detector indicates the value higher than the predetermined target temperature; and
determining whether the pump is driven to circulate the coolant into the water-cooled engine and the heat exchanger by the predetermined flow quantity and to indicate the Reynolds number of the coolant circulated within the tubes of the heat exchanger indicates a predetermined number which falls within the predetermined range of the Reynolds number of 1800 through 6000 when the fan motor is not being operated. - View Dependent Claims (9, 10)
-
-
11. A cooling system for a water-cooled internal combustion engine, comprising:
-
a heat exchanger to circulate a coolant flowing out from the water-cooled engine into tubes arranged in a space between headers thereof to cool the coolant;
a pump driven independently of the water-cooled engine to circulate the coolant into the water-cooled engine and the heat exchanger;
a temperature detector to detect a temperature of the coolant; and
a controller that drivingly controls the pump on the basis of a detected value of the coolant temperature by the temperature detector in such a manner as to control the drive of the pump for the coolant to be circulated by a predetermined flow quantity, when the temperature of the coolant detected by the temperature detector indicates a value higher than a predetermined target temperature, the heat exchanger being arranged, at the predetermined flow quantity of the coolant, to cause a stream state of the coolant circulated within the tubes of the heat exchanger to fall within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range, wherein the water-cooled engine comprises a cylinder head coolant passage that cools a cylinder head, a cylinder block coolant passage, communicated with the cylinder head coolant passage, that cools a cylinder block, the coolant being introduced from the cylinder head coolant passage and being outputted to the cylinder block coolant passage, and wherein the coolant is introduced into the cylinder head coolant passage under a temperature state of 80°
C. through 95°
C. and outputted from the cylinder block coolant passage under another temperature state of 100°
C. through 115°
C.
-
Specification