US 4,908,764 A · System and method for automatically controlling a vehicle speed to a desired cruising speed

Abstract

A system and method for automatically controlling a vehicle speed to a desired cruising speed applicable to vehicles in which a basic manipulated variable corresponding, for instance, to an operation time of either of acceleration or deceleration valve in an actuator for actuating an engine throttle valve of a vehicle in which the system is mounted toward the acceleration or deceleration direction which is derived on the basis of the vehicle speed and target cruising speed so that the vehicle speed coincides with the desired target cruising speed is corrected according to a transfer function of a response to the opening angle of the throttle valve to the manipulated variable. The response of the throttle valve to a change in the manipulated variable is measured and the transfer function is computed on the basis of the measured response to compensate for vehicle variations and aging effects.

Claims8

Dependent claims

A system for automatically controlling a vehicle speed to a desired cruising speed, comprising:

(a) first means for measuring the vehicle speed;
(b) second means for setting the vehicle speed to the desired target cruising speed according to a driver's intention;
(c) third means for controlling an engine input variable which is correlated to an engine output of a vehicle in which the system is mounted on the basis of a manipulated variable so that the vehicle speed coincides with the target cruising speed;
(d) fourth means for calculating a basic manipulated variable on the basis of the measured vehicle speed and desired target cruising speed set by said second means;
(e) fifth means for measuring the input variable of the engine output;
(f) sixth means for calculating a transfer function of a response of the engine input variable to a change in the manipulated variable;
and
(g) seventh means for correcting the basic manipulated variable on the basis of the transfer function calculated by the sixth means and setting and outputting the corrected manipulated variable to the third means.

5 more elements

A system for automatically controlling a vehicle speed to a desired cruising speed, comprising:

(a) first means for measuring the vehicle speed;
(b) second means for setting the vehicle speed to the desired target cruising speed according to a driver's intention;
(c) third means for controlling an opening angle of a throttle valve of an engine of a vehicle in which the system is mounted on the basis of a manipulated variable so that the vehicle speed coincides with the target cruising speed;
(d) fourth means for calculating a basic manipulated variable on the basis of the measured vehicle speed and desired target cruising speed set by said second means;
(e) fifth means for measuring the opening angle of the throttle valve;
(f) sixth means for calculating a transfer function of a response of the opening angle of the throttle valve measured by the fifth means to a change in the manipulated variable;
and
(g) seventh means for correcting the basic manipulated variable on the basis of the transfer function calculated by the sixth means and setting and outputting the corrected manipulated variable to the third means.

5 more elements

Dependencies are inferred from the claim text.

System and method for automatically controlling a vehicle speed to a desired cruising speed

Life of this patent

System and method for automatically controlling a vehicle speed to a desired cruising speed

Life of this patent

Abstract

Claims8