Automatic transmission electronic gearshift control having altit

Details Automatic transmission electronic gearshift control having altit Automatic transmission electronic gearshift control having altit

1988-10-24

1990-07-24

Lall, Parshotam S.

Boots, shoes, and leggings

74866, B60K 4118, G06F 1520

Patent

active

049439219

ABSTRACT:
An electronic control system for scheduling gearshifts in a four speed automatic transmission includes storing in electronic memory accessible to a microprocessor, six functions relating vehicle speed to throttle position, one function being related to each upshift and downshift. Gearshifts are made by probing computer memory with current values for throttle position and vehicle speed, and determining on the basis of the stored shift schedule whether an upshift or downshift is required. Upshift points are determined also on the basis of the maximum engine speed when a wide open throttle condition is detected. Ambient barometric pressure alters the vehicle speed and engine speed attained at high altitude in comparison to those speeds that result for the same throttle position at sea level. Therefore, shift points defined by the schedule on the basis of vehicle speed and throttle position, and shift points relates to wide open throttle conditions and engine speed, are corrected for altitude or barometric pressure changes from a reference barometric pressure at which the shift points are determined for the functions stored in computer memory.

REFERENCES:
patent: 4416239 (1983-11-01), Takase et al.
patent: 4502354 (1985-03-01), Suzuki et al.
patent: 4699604 (1987-10-01), Yokoyama
patent: 4714067 (1987-12-01), Staerzl
patent: 4720792 (1988-01-01), Kasai et al.
patent: 4732055 (1988-03-01), Tateno et al.

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