Interrelated power delivery controls – including engine control – Transmission control – Control by sensed ambient condition – pattern indicia,...
Reexamination Certificate
1998-07-31
2001-04-24
Ta, Khoi Q. (Department: 3684)
Interrelated power delivery controls, including engine control
Transmission control
Control by sensed ambient condition, pattern indicia,...
C701S053000, C701S065000
Reexamination Certificate
active
06220986
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a vehicle control system and a recording medium storing programs for the system.
2. Description of Related Art
In an automatic transmission of the related art, a vehicle speed and a throttle opening are detected to select a gear stage corresponding to the vehicle speed and the throttle opening, so that a gear ratio of the transmission is changed to effect an upshift or downshift.
Moreover, the speed change for the downshift is exemplified by the speed change of a kickdown when the driver depresses the accelerator pedal intensely, the speed change of a coast-down when the driver releases the accelerator pedal to lower the vehicle speed, or the speed change which is effected when the driver operates the shift device such as a shift lever or a shift switch.
In the automatic transmission of the related art, however, when the vehicle comes to a corner, the speed change of the downshift is not ordinarily performed. When the vehicles comes out of the corner, the speed change of the downshift is performed by the kickdown.
Therefore, there has been proposed a vehicle control device which is enabled to change the speed by the downshift on the basis of the road situations. In this proposal, an upper limit gear stage is set to keep an upper gear stage than the upper limit one from being selected, when predetermined conditions such as an estimation that the vehicle comes to the corner and a release of the accelerator pedal are satisfied.
When the corner continues, however, the upper limit gear stage is repeatedly set so that the gear stage is frequently changed to degrade the drive feeling.
SUMMARY OF THE INVENTION
The invention has been conceived to solve the above-specified problems of the related art and has an object to provide a vehicle control system which is freed from having a degraded drive feeling when the corner continues, and a recording medium storing programs for the system.
According to the invention, therefore, there is provided a vehicle control system comprising a vehicle speed sensor for detecting the speed of a vehicle; recommended gear stage determine means for determining a recommended gear stage of an automatic transmission matched to the vehicle speed and road situations; upper limit gear stage set means for setting an upper limit gear stage on the basis of the recommended gear stage; and shift means for changing the speed at the upper limit gear stage.
Moreover, the recommended gear stage determine means includes suppress means for suppressing the number of determinations of the recommended gear stage at a corner.
In the vehicle control system of the invention, moreover the recommended gear stage determine means performs a hold control to keep the present gear stage, when the vehicle speed exceeds a first set value, and a shift allowance control to allow a downshift when the vehicle speed exceeds a second set value.
Moreover, in the vehicle control system of the invention, the suppress means suppresses the number of determinations of the recommended gear stage by widening the area of the hold control.
In the vehicle control system of the invention, the suppress means suppresses the number of determinations of the recommended gear stage by widening the area of the shift allowance control.
In addition, the vehicle control system of the invention further comprises corner continuity decide means for deciding whether the corner continues.
Further, the suppress means suppresses the number of determinations of the recommended gear stage when the corner continues.
According to the invention, there is also provided a recording medium stored with programs for determining a recommended gear stage of an automatic transmission matched to a vehicle speed and road situations; for setting an upper limit gear stage on the basis of the recommended gear stage; for making a speed change at the upper limit gear stage; and for suppressing the number of determinations of the recommended gear stage at a corner.
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Aruga Hideki
Iwatsuki Kunihiro
Ota Takashi
Shiimado Toshihiro
Aisin Aw Co. Ltd.
Oliff & Berridg,e PLC
Ta Khoi Q.
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