Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1995-06-07
1997-09-23
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 48, 477120, 477901, F16H 5906, F16H 5966
Patent
active
056698470
ABSTRACT:
With the present invention, it is possible for a vehicle to run on an uphill road at substantially the same throttle opening as on a horizontal road.
When the road is uphill (hill-climbing resistance R.theta.>0), a maximum acceleration Amax for a full throttle opening is obtained according to a vehicle speed, and a maximum driving force Fmax=m.multidot.Amax+RL is calculated based on the mass of the vehicle m and the rolling and air resistance RL of the vehicle. Then, a correction coefficient HOS is obtained according to a throttle opening to calculale a required driving force Ftgt=Fmax.multidot.HOS. According to the required driving force Ftgt, hill-climbing resistance R.theta., and vehicle speed VSP, a target horsepower Ptgt=(Ftgt+R.theta.).multidot.VSP is calculated. To attain the target horsepower Ptgt, a target speed change ratio "itgt" for a continuously variable transmission is calculated to control the transmission.
REFERENCES:
patent: 4625590 (1986-12-01), Muller
patent: 4735114 (1988-04-01), Satoh et al.
patent: 4945483 (1990-07-01), Tokoro
patent: 5231581 (1993-07-01), Takahashi et al.
patent: 5319555 (1994-06-01), Iwaki et al.
Ta Khoi Q.
Unisia Jecs Corporation
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