Failure detecting system and method for automatic transmission

Interrelated power delivery controls – including engine control – Transmission control – With brake control

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Details

477 96, 477906, 192 4A, B60K 4100, B60K 4126

Patent

active

055734758

ABSTRACT:
In case where an engine rotational detection signal from an ignition pulse generator is not appropriately detected even if an amount of induction air and a fuel injection amount are larger than predetermined values, an engine rotational signal failure is decided, and an automatic transmission is controlled in a state before the decision. Therefore, the automatic transmission control based on the engine rotational speed such as, for example, a speed shift control (ordinarily a shift control), a lockup control (ordinarily a lockup control, a smooth control), a line pressure control (ordinarily a line pressure control, a starting time control) can be appropriately controlled. Thus, the automatic transmission control can be executed based on the engine rotational speed. In case where any of the conditions of (1) when the cruise control signal is erroneously turned on in case where a vehicle speed is smaller than a value in the case of non operation of a cruise control, (2) when the cruise control signal which ought to be released is erroneously turned on at the time of turning a brake switch on, (l) when the cruise control signal is erroneously turned on in an "N" or "P" range, (4) when any of the paragraphs (1) to (3) is continued for a predetermined time, are satisfied, a failure of the cruise control set signal line is detected, and the automatic transmission control of the cruise control is prohibited. The normal state is recovered when an off signal of the cruise control set is detected in the above-described conditions. Accordingly, since a failure of the cruise control set signal line is reliably detected, the automatic transmission control is appropriately executed by using the cruise control signal. Thus, the automatic transmission control can be executed based on a cruise control signal.

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