Constant speed cruise control system of the duty ratio control type
First Claim
1. A constant speed cruise control system for maintaining an actual car speed at a stored target car speed by duty ratio control of a control valve which is provided inside an actuator, to which an atmosphere or an engine vacuum is introduced alternatively, comprising:
- a car speed sensor and a car speed detecting means for generating a signal in accordance with an actual detected car speed;
a memory means for storing said actual car speed detected by said car speed detecting means as the stored target speed in response to manipulation of a set switch;
a means for calculating a set duty ratio SD in accordance with a basic duty ratio in a constant speed control;
a means for calculating a duty ratio in accordance with a difference between said actual car speed and the stored target speed;
a means for actuating the control valve in response to an output ratio D which is determined by added said set duty ratio SD to said duty ratio;
a correction means for correcting said set duty ratio SD by excluding a car speed deviation which occurs when said output duty ratio D changes, said correction means comprising;
a first means for calculating a low-speed integrating element SD1 for following gradually to a value of said output duty ratio D in response to changes of said output duty ratio D;
a second means for calculating a high-speed integrating element DM for following quickly to a value of said output duty ratio D in response to changes of said output duty ratio D;
a third means for calculating a first correct value of(DM-SD1)/nwherein;
SD1;
said low-speed integrating elementDM;
said high-speed integrating elementn;
a predetermined coefficienta fourth means for calculating said set duty ratio SD based on said low-speed integrating element SD1 and said first correction value.
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Accused Products
Abstract
A constant speed cruise control system of duty ratio control type for approximating an actual car speed to a stored target car speed, by on/off control of a control valve of an actuator to adjust the throttle valve opening degree by an output duty ratio D obtained from a control line having a gradient showing a conversion characteristic of car speed and duty ratio.
The system has a controller in which
a set duty ratio DS corresponding to the target car speed is calculated as
SD=SD1+(DM-SD1)/n
and the output duty ratio D is calculated as
D=G×V+SD
where
G: gradient of control line
V: car speed deviation
DM: integrating element responding quickly to duty ratio change
SD1: integrating element responding slowly to duty ratio change
n: coefficient
and the controller corrects to integrate the set duty ratio SD in a direction of approximating the output duty ratio D.
27 Citations
15 Claims
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1. A constant speed cruise control system for maintaining an actual car speed at a stored target car speed by duty ratio control of a control valve which is provided inside an actuator, to which an atmosphere or an engine vacuum is introduced alternatively, comprising:
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a car speed sensor and a car speed detecting means for generating a signal in accordance with an actual detected car speed; a memory means for storing said actual car speed detected by said car speed detecting means as the stored target speed in response to manipulation of a set switch; a means for calculating a set duty ratio SD in accordance with a basic duty ratio in a constant speed control; a means for calculating a duty ratio in accordance with a difference between said actual car speed and the stored target speed; a means for actuating the control valve in response to an output ratio D which is determined by added said set duty ratio SD to said duty ratio; a correction means for correcting said set duty ratio SD by excluding a car speed deviation which occurs when said output duty ratio D changes, said correction means comprising; a first means for calculating a low-speed integrating element SD1 for following gradually to a value of said output duty ratio D in response to changes of said output duty ratio D; a second means for calculating a high-speed integrating element DM for following quickly to a value of said output duty ratio D in response to changes of said output duty ratio D; a third means for calculating a first correct value of (DM-SD1)/n wherein; SD1;
said low-speed integrating elementDM;
said high-speed integrating elementn;
a predetermined coefficienta fourth means for calculating said set duty ratio SD based on said low-speed integrating element SD1 and said first correction value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A constant speed cruise control system for maintaining an actual car speed at a stored target car speed by duty ratio control of a control valve which is provided inside an actuator, to which an atmosphere or an engine vacuum is introduced alternatively, comprising:
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a car speed sensor and a car speed detecting means for generating a signal in accordance with an actual car speed; a memory means for storing said actual car speed detected by said car speed detecting means as the stored target speed in response to manipulation of a set switch; a means for calculating a set duty ratio SD in accordance with a basic duty ratio in a constant speed control; a means for calculating a duty ratio in accordance with a difference between said actual car speed and the stored target speed; a means for actuating the control valve in response to an output duty ratio D which is determined by adding set said duty ratio SD to said duty ratio; a correction means for correcting said set duty ratio SD by excluding a car speed deviation which occurs when said output duty ratio D changes, said correction means comprising; a first means for calculating a correction value τ
in response to a difference between said set duty ratio SD and said output duty ratio D;a second means for changing said set duty ratio SD in response to said correction value τ
. - View Dependent Claims (10, 11, 12)
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13. A constant speed cruise control system for maintaining an actual car speed at a stored target car speed by duty ratio control of a control valve which is provided inside an actuator, to which an atmosphere or an engine vacuum is introduced alternatively, comprising:
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a car speed sensor and a car speed detecting means for generating a signal in accordance with an actual detected car speed; a memory means for storing said actual speed detected by said car speed detecting means as the stored target speed in response to manipulation of a set switch; a means for calculating a set duty ratio SD in accordance with a basic duty ratio in a constant speed control; a means for calculating a duty ratio in accordance with a difference between said actual car speed and the stored target speed; a means for actuating the control valve in response to a output duty ratio D which is determined by adding said set duty ratio SD to said duty ratio; an acceleration detecting means for detecting an acceleration of a car; a correction means for adding a correction duty ratio to said output duty ratio D when said acceleration exceeds a specified valve. - View Dependent Claims (14, 15)
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Specification