Fail-safe driving torque distribution control system for 4WD vehicle
First Claim
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1. A fail-safe driving force distribution control system for a vehicle, comprising;
- basic controlling means for varying a distribution of a driving force produced by a prime mover of said vehicle between front and rear axles of said vehicle,failure detecting means for producing a failure detection signal when a failure occurs in said basic means, andfail-safe means for gradually varying said distribution to a predetermined fail-safe state upon receipt of said failure detection signal.
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Abstract
A fail-safe control system includes one or more circuits for detecting failures in sensors and an actuator of a driving force distribution control system of a 4WD vehicle, and a fail-safe means which, if a failure is detected, gradually disengage a transfer clutch until the 2WD state is reached, in such a gradual manner as to prevent spin or drift-out of the vehicle. The fail-safe means may decrease the magnitude of an electric control signal gradually, or may employ a fail-safe valve for gradually decreasing a fluid pressure supplied to the transfer clutch.
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15 Claims
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1. A fail-safe driving force distribution control system for a vehicle, comprising;
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basic controlling means for varying a distribution of a driving force produced by a prime mover of said vehicle between front and rear axles of said vehicle, failure detecting means for producing a failure detection signal when a failure occurs in said basic means, and fail-safe means for gradually varying said distribution to a predetermined fail-safe state upon receipt of said failure detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification