Speed change control apparatus for a vehicular automatic transmission and a troubleshooting method for operating a condition detecting device
First Claim
1. A speed change control apparatus for a vehicular automatic transmission having a plurality of transmission stages, including an operating condition detecting device for detecting operating conditions of a vehicle, which changes a transmission stage position of the automatic transmission in accordance with an output value of the operating condition detecting device, said speed change control apparatus comprising:
- first transmission stage setting means for setting an optimum transmission stage of the automatic transmission by fuzzy inference based on the output value of the operating condition detecting device;
failure detecting means for detecting a failure of the operating condition detecting device;
fuzzy inference inhibiting means for inhibiting the first transmission stage setting means from setting the optimum transmission stage by the fuzzy inference when the failure of the operating condition detecting device is detected; and
transmission stage fixing means for fixing the transmission stage to a predetermined transmission stage when the failure is detected.
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0 Petitions
Accused Products
Abstract
A speed change control method for a vehicular automatic transmission, in which the transmission stage position of the automatic transmission having a plurality of transmission stages is changed to an optimum transmission stage set by fuzzy inference on the basis of parameter values indicative of the operating conditions of a vehicle. If a failure of any of sensors for detecting the parameter values concerned in the fuzzy inference is detected, setting the optimum transmission stage by the fuzzy inference is inhibited, and the optimum transmission stage is set in a speed change control mode which is not dependent upon the broken sensor. Thus, even in case of failure of a sensor, the vehicle can be driven without hindrance and without discomfort to a driver or fellow passengers.
21 Citations
8 Claims
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1. A speed change control apparatus for a vehicular automatic transmission having a plurality of transmission stages, including an operating condition detecting device for detecting operating conditions of a vehicle, which changes a transmission stage position of the automatic transmission in accordance with an output value of the operating condition detecting device, said speed change control apparatus comprising:
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first transmission stage setting means for setting an optimum transmission stage of the automatic transmission by fuzzy inference based on the output value of the operating condition detecting device; failure detecting means for detecting a failure of the operating condition detecting device; fuzzy inference inhibiting means for inhibiting the first transmission stage setting means from setting the optimum transmission stage by the fuzzy inference when the failure of the operating condition detecting device is detected; and transmission stage fixing means for fixing the transmission stage to a predetermined transmission stage when the failure is detected.
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2. A speed change control method for a vehicular automatic transmission having a plurality of transmission stages, including an operating condition detecting device for detecting operating conditions of a vehicle, which changes the transmission stage of the automatic transmission in accordance with an output value of the operating condition detecting device, said speed change control method comprising the steps of:
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(a) setting an optimum transmission stage of the automatic transmission by fuzzy inference based on the output value of the operating condition detecting device; (b) detecting a failure of the operating condition detecting device; (c) inhibiting the optimum transmission stage from being set by the fuzzy inference when the failure of the operating condition detecting device is detected; and (d) fixing the transmission stage to a predetermined transmission stage when the failure is detected. - View Dependent Claims (3, 4, 5, 6)
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7. A speed change control apparatus for a vehicular automatic transmission having a plurality of transmission stages, including an operating condition detecting device for detecting operating conditions of a vehicle, which changes a transmission stage of the automatic transmission in accordance with an output value of the operating condition detecting device, said speed change control apparatus comprising:
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first transmission stage setting means for setting an optimum transmission stage of the automatic transmission by fuzzy inference based on the output value of the operating condition detection device; failure detecting means for detecting a failure of the operating condition detecting device; fuzzy inference inhibiting means for inhibiting the first transmission stage setting means from setting the optimum transmission stage by the fuzzy inference when the failure of the operating condition detecting device is detected; a vehicle velocity detecting device; an engine load detecting device; reference transmission stage setting means for setting, in accordance with output values of said vehicle velocity detecting device and said engine load detecting device, the transmission stage to a corresponding one of transmission stages which are set beforehand in accordance with vehicle velocity and engine load; and transmission stage fixing means for fixing the transmission stage to a predetermined transmission stage; wherein the transmission stage is set by said reference transmission stage setting means when said fuzzy inference inhibiting means inhibits said first transmission stage setting means from setting the optimum transmission stage by the fuzzy inference; and wherein the transmission stage is fixed to the predetermined transmission stage by said transmission stage fixing means when the failure of said vehicle velocity detecting device or said engine load detecting device is detected.
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8. A speed change control method for a vehicular automatic transmission having a plurality of transmission stages, including an operating condition detecting device for detecting operating conditions of a vehicle, which changes a transmission stage of the automatic transmission in accordance with an output value of the operating condition detecting device, said speed change control method comprising the steps of:
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setting an optimum transmission stage of the automatic transmission by fuzzy inference based on the output value of the operating condition detecting device; detecting a failure of the operating condition detecting device; inhibiting the optimum transmission stage from being set by the fuzzy inference when the failure of the operating condition detecting device is detected; detecting vehicle velocity by the use of a vehicle velocity detecting device; detecting engine load by the use of an engine load detecting device; setting, in accordance with output values of the vehicle velocity detecting device and the engine load detecting device, the transmission stage to a corresponding one of transmission stages, which are set beforehand in accordance with vehicle velocity and engine load, when the optimum transmission stage is inhibited from being set by the fuzzy inference; and fixing the transmission stage to a predetermined transmission stage when the failure of the vehicle velocity detecting device or the engine load detecting device is detected.
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Specification