Fault detecting apparatus for four-wheel drive vehicle
First Claim
1. A fault detecting apparatus for detecting a fault in a speed increasing system in a four-wheel drive vehicle configured to transmit a driving force of a prime mover directly to a left and a right main driving wheel and to a left and a right sub-driving wheel through a clutch, wherein said speed increasing system is configured to increase a rotational speed of the sub-driving wheels above a rotational speed of the main driving wheels when a speed increasing instruction signal is outputted, said apparatus comprising:
- fault detecting means for detecting a fault in said speed increasing system; and
fault detection disabling means for disabling the detection of a fault by said fault detecting means until a predetermined time has elapsed after the speed increase instruction signal was outputted or after the output of the speed increase instruction signal was stopped.
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Accused Products
Abstract
A fault detecting apparatus for a four-wheel drive vehicle is provided for avoiding without fail any erroneous detection due to a response delay associated with an operation for switching a speed increasing system and due to sudden fluctuations in wheel speed, to highly accurately detect a fault in the speed increasing system. The speed increasing system is configured to transmit a driving force of a prime mover directly to main driving wheels and to sub-driving wheels through associated clutches, and to increase rotational speed of the sub-driving wheels above rotational speed of the main driving wheels when a speed increase instruction signal is outputted. The fault detecting apparatus comprises an S-AWD•ECU for detecting a fault in the speed increasing system, and for disabling the fault detection until a predetermined time has elapsed after a speed increase instruction signal was outputted or after the output of the speed increase instruction signal was stopped.
31 Citations
3 Claims
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1. A fault detecting apparatus for detecting a fault in a speed increasing system in a four-wheel drive vehicle configured to transmit a driving force of a prime mover directly to a left and a right main driving wheel and to a left and a right sub-driving wheel through a clutch, wherein said speed increasing system is configured to increase a rotational speed of the sub-driving wheels above a rotational speed of the main driving wheels when a speed increasing instruction signal is outputted, said apparatus comprising:
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fault detecting means for detecting a fault in said speed increasing system; and fault detection disabling means for disabling the detection of a fault by said fault detecting means until a predetermined time has elapsed after the speed increase instruction signal was outputted or after the output of the speed increase instruction signal was stopped. - View Dependent Claims (2, 3)
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Specification