METHOD AND APPARATUS TO MONITOR AN OUTPUT SPEED SENSOR DURING OPERATION OF AN ELECTRO-MECHANICAL TRANSMISSION
First Claim
1. Method to monitor a sensing system adapted to monitor an output of an electro-mechanical transmission, comprising:
- monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission;
determining a first expected output of the transmission based upon the rotational speed of the wheel;
determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; and
,comparing the first and second expected outputs and an output of the sensing system adapted to monitor the output of the electro-mechanical transmission.
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Accused Products
Abstract
There is provided a method to monitor a sensing system adapted to monitor an output of an electro-mechanical transmission. This includes monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission. A first expected output of the transmission is determined based upon the output of the first sensor. A second expected output of the transmission is determined based upon a rotational speed of a torque-generative device operatively connected to the transmission. The first and second expected outputs and an output of the sensing system adapted to monitor the output of the electro-mechanical transmission are compared.
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Citations
19 Claims
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1. Method to monitor a sensing system adapted to monitor an output of an electro-mechanical transmission, comprising:
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monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission; determining a first expected output of the transmission based upon the rotational speed of the wheel; determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; and
,comparing the first and second expected outputs and an output of the sensing system adapted to monitor the output of the electro-mechanical transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method to detect a fault in a sensor and target wheel adapted to monitor rotational speed of an output shaft of an electro-mechanical transmission, comprising:
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monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission; determining a first expected output of the transmission based upon the rotational speed of the wheel; determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; and
,comparing an output of the sensor with the first and second expected outputs of the transmission. - View Dependent Claims (9, 10, 11, 12)
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13. Method to control operation of a powertrain adapted to transmit power to a wheel via a driveline, the powertrain comprising an internal combustion engine operatively connected to an electro-mechanical transmission selectively operative in one of fixed gear and continuously variable operating modes, the method comprising:
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monitoring rotational speed of the wheel operatively connected to the driveline operatively connected to an output of the transmission; determining a first expected output of the transmission based upon the rotational speed of the wheel; determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; comparing the first and second expected outputs and an output of a sensing system adapted to monitor rotational speed of the output of the transmission; identifying a fault in the sensing system adapted to monitor the rotational speed of the electro-mechanical transmission when the output of the sensing system differs from an average of the first and second expected outputs of the transmission by less than a predetermined threshold; and
,controlling operation of the transmission based upon the first expected output of the transmission when a fault is identified. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification