Cruise control device for motor vehicles
First Claim
1. A cruise control device for maintaining the speed of a motor vehicle close to a target vehicle speed by controlling an operation parameter for adjusting the output of an engine provided in the vehicle, comprising:
- a vehicle speed sensor for detecting an actual vehicle speed of the vehicle;
means for setting the target vehicle speed;
calculating means for obtaining a vehicle speed deviation between the target vehicle speed and the actual vehicle speed;
means for selecting a proportional control mode (P control mode) when the absolute value of the vehicle speed deviation is larger than a first value, and for controlling the operation parameter in accordance with the selected P control mode;
means for selecting a proportional-plus-integral-plus derivation control mode (PID control mode) when the absolute value of the vehicle speed deviation is between the first value and a second value smaller than the first value, and for controlling the operation parameter in accordance with the selected PID control mode; and
means for selecting a fuzzy control mode when the absolute value of the vehicle speed deviation is smaller than the second value, and for controlling the operation parameter in accordance with the selected fuzzy control mode.
1 Assignment
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Accused Products
Abstract
A cruise control device is provided with a vehicle speed sensor for detecting the actual vehicle speed, and an electronic controller for controlling the opening of the throttle valve based on the detected vehicle speed, to bring the vehicle speed close to a target vehicle speed. The electronic controller serves to obtain a vehicle speed deviation between the target vehicle speed set by a set switch and the actual vehicle speed, select one of a P control mode, a P/D control mode and a fuzzy control mode corresponding to the magnitude of the vehicle speed deviation, and control the opening of the throttle valve. In addition to these functions, the electronic controller may additionally have the function of estimating a change in the vehicle speed provided that the current opening of the throttle valve is maintained, to obtain a correction value for the vehicle speed so that a corrected vehicle speed corrected by the correction value is used to control the opening of the throttle valve. Further, in the case of a vehicle provided with an automatic transmission, a shift diagram applied to a cruise control mode may be prepared in addition to the shift diagram for the automatic transmission itself, so that the electronic controller may have the function of effecting a shifting of the gear ratios of the automatic transmission.
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Citations
5 Claims
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1. A cruise control device for maintaining the speed of a motor vehicle close to a target vehicle speed by controlling an operation parameter for adjusting the output of an engine provided in the vehicle, comprising:
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a vehicle speed sensor for detecting an actual vehicle speed of the vehicle; means for setting the target vehicle speed; calculating means for obtaining a vehicle speed deviation between the target vehicle speed and the actual vehicle speed; means for selecting a proportional control mode (P control mode) when the absolute value of the vehicle speed deviation is larger than a first value, and for controlling the operation parameter in accordance with the selected P control mode; means for selecting a proportional-plus-integral-plus derivation control mode (PID control mode) when the absolute value of the vehicle speed deviation is between the first value and a second value smaller than the first value, and for controlling the operation parameter in accordance with the selected PID control mode; and means for selecting a fuzzy control mode when the absolute value of the vehicle speed deviation is smaller than the second value, and for controlling the operation parameter in accordance with the selected fuzzy control mode. - View Dependent Claims (2, 3, 4, 5)
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Specification