Interrelated power delivery controls – including engine control – Clutch control – With fluid drive
Reexamination Certificate
2001-05-14
2004-06-08
Pang, Roger (Department: 3681)
Interrelated power delivery controls, including engine control
Clutch control
With fluid drive
Reexamination Certificate
active
06746368
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle speed control system for controlling a vehicle speed, and more particularly to a control system which controls an automotive vehicle so as to automatically cruise at a set vehicle speed.
Japanese Patent Provisional Publication No. (Heisei) 7-300026 discloses a vehicle speed control system which is arranged to put an automatic transmission with a torque converter in an un-lockup condition when the automatic transmission of the vehicle is put in a low temperature condition or in a troubled condition, in order to prevent the automatic transmission from generating the engine stall for the reason that the operation of a lockup mechanism of the torque converter is degraded by the low temperature condition.
SUMMARY OF THE INVENTION
However, the response characteristic and the gain characteristic of the vehicle are varied according to whether the automatic transmission is put in a lockup condition or not. That is, if the response characteristic adapted to the lockup condition is employed and if the transmission is put in an un-lockup condition, a control stability of the vehicle is degraded by generating a drift between the controlled system and a vehicle speed control system. More specifically, if the response characteristic of the vehicle speed control system is adjusted to the response characteristic in the condition that the transmission is put in the lockup condition, the control characteristic of the control system during the un-lockup condition becomes too quick. Further, if the response characteristic of the transmission during the un-lockup condition is varied by improving the performance of the torque converter of the transmission, the total production cost of the transmission becomes high.
It is therefore an object of the present invention to provide a vehicle speed control system which can be adapted to both of the response characteristic in the lockup condition and the response characteristics in the un-lockup condition.
A vehicle speed control system according to the present invention is for a vehicle which is equipped with an automatic transmission with a lockup torque converter. The vehicle control system comprises a detecting section that detects whether the automatic transmission is put in a lockup condition, a correcting section that corrects a command drive torque according to the lock-up condition of the automatic transmission and a controlling section that controls a vehicle speed of the vehicle by commanding the vehicle to generate the corrected command drive torque.
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Adachi Kazutaka
Ino Junsuke
Ishizu Takeshi
Sudo Hideki
Foley & Lardner LLP
Nissan Motor Co,. Ltd.
Pang Roger
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