Automatic transmission and engine control system

Details Automatic transmission and engine control system Automatic transmission and engine control system

1991-06-05

1992-04-14

Bonck, Rodney H.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74858, 74861, B60K 4106

Patent

active

051036924

ABSTRACT:
In order to determine a malfunction which results in the loss of torque reduction control, the engine speed and the torque converter characteristics are monitored when a torque down signal is issued. The maximum engine torque which should be produced under such circumstances is used to derive a corresponding maximum engine speed value. If the actual engine speed exceeds the estimated value, appropriate torque down control can be assumed to have been lost. In response a fail safe such as boosting line pressure to switching to an alternative source of torque control can implemented. A suitable warning signal can also be generated.

REFERENCES:
patent: 4166440 (1979-09-01), Helava et al.
patent: 4403527 (1983-09-01), Mohl et al.
patent: 4724723 (1988-02-01), Lockhart et al.
patent: 4889014 (1989-12-01), Iwata
patent: 4933851 (1990-06-01), Ito et al.
patent: 4938100 (1990-07-01), Yoshimura et al.
patent: 4939956 (1990-07-01), Takizawa

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