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US 5,203,423 AGranted
Vehicle constant-speed cruising device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYasuhiro Fujiwara, Kazuyori Katayama
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Abstract
A vehicle constant-speed cruising device, in which, with respect to the pulse width of a pulse signal for an actuator adapted to operate an engine throttle valve, acceleration and deceleration signals given during a predetermined past period of time are stored, to estimate cable-layout hysteresis and correct it. Thereby, the vehicle speed is improved in maintenance and in convergence, thus making it comfortable to ride in the vehicle.
Claims7
A vehicle constant-speed cruising device, comprising:
- travel speed measuring means for measuring a travel speed of a vehicle;
- target speed setting means for setting a target speed of said vehicle;
- speed difference calculating means for calculating a speed difference between said target speed and said travel speed;
- acceleration calculating means for calculating an acceleration of said vehicle in response to said travel speed signal;
- pulse width calculating means for calculating a pulse width of a pulse signal having a predetermined period in response to said speed difference and said acceleration;
- an actuator for operating an engine throttle valve in response to said pulse width thus calculated;
- output signal storing means for receiving an output from said pulse width calculating means, to store acceleration and deceleration signals output during a predetermined past period of time;
- and
- cable-layout hysteresis correcting means for receiving outputs of said pulse width calculating means and said output signal storing means, to subject the output of said pulse width calculating means to cable-layout hysteresis correction.
6 more elements
A vehicle constant-speed cruising device, comprising:
- means for measuring a first speed of a vehicle;
- means for setting a second speed of said vehicle;
- a speed difference calculator which calculates a speed difference between said second speed and said first speed;
- an acceleration calculator which calculates an acceleration of said vehicle in response to said first speed signal;
- a pulse width calculator which calculates a pulse width of a pulse signal having a predetermined period in response to said speed difference and said acceleration;
- an actuator being operated in response to said pulse width thus calculated;
- means for receiving an output from said pulse width calculating means and storing first and second signals output during a predetermined first period of time;
- and
- means for receiving outputs of said pulse width calculating means and said output receiving and storing means, and for subjecting the output of said pulse width calculating means to cable-layout hysteresis correction.
6 more elements
Dependencies are inferred from the claim text.