SYSTEM AND METHOD FOR CONTROLLING A TRANSMISSION
First Claim
1. A system for controlling a vehicle, the system comprising:
- a prime mover including an output shaft;
a transmission having an input shaft, a clutch assembly, a plurality of gears, a plurality of torque transmitting devices, and an output shaft, wherein the clutch assembly includes a friction clutch that rotationally couples the input shaft with the plurality of gears, and wherein the plurality of torque transmitting devices are selectively engageable with the plurality of gears to establish a plurality of speed ratios between the input shaft and the output shaft;
a first sensor configured to detect a rotational speed of the input shaft of the transmission and output a first signal indicative of the speed of the input shaft of the transmission;
a second sensor configured to detect a rotational speed of the output shaft of the prime mover and output a second signal indicative of the speed of the output shaft of the prime mover;
a transmission controller in electronic communication with the first and second sensors and operable to control the transmission by selectively engaging the plurality of torque transmitting devices, wherein the transmission controller includes control logic comprising;
a first control logic for controlling the transmission using the first signal of the first sensor;
a second control logic for performing a diagnostic check on the first sensor;
a third control logic for determining whether the diagnostic check of the second control logic indicates that the first sensor meets a predefined performance characteristic;
a fourth control logic for instructing the transmission controller to use the second signal of the second sensor to control the transmission if the third control logic indicates that the first sensor does not meet the predefined performance characteristic; and
a fifth control logic for controlling the transmission using the second signal of the second sensor.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a system for controlling a vehicle comprising a prime mover, a first sensor, a transmission, a second sensor, and a transmission controller. The first sensor outputs a first signal that indicates a speed of an input shaft of the transmission and the second sensor outputs a second signal that indicates a speed of the prime mover. The transmission controller includes control logics that control the transmission using the first signal, perform a diagnostic check on the first sensor, determining whether the diagnostic check of the second control logic indicates that the first sensor meets a predefined performance characteristic, instruct the transmission controller to use the second signal of the second sensor to control the transmission if the third control logic indicates that the first sensor does not meet the predefined performance characteristic, and control the transmission using the second signal of the second sensor.
6 Citations
20 Claims
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1. A system for controlling a vehicle, the system comprising:
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a prime mover including an output shaft; a transmission having an input shaft, a clutch assembly, a plurality of gears, a plurality of torque transmitting devices, and an output shaft, wherein the clutch assembly includes a friction clutch that rotationally couples the input shaft with the plurality of gears, and wherein the plurality of torque transmitting devices are selectively engageable with the plurality of gears to establish a plurality of speed ratios between the input shaft and the output shaft; a first sensor configured to detect a rotational speed of the input shaft of the transmission and output a first signal indicative of the speed of the input shaft of the transmission; a second sensor configured to detect a rotational speed of the output shaft of the prime mover and output a second signal indicative of the speed of the output shaft of the prime mover; a transmission controller in electronic communication with the first and second sensors and operable to control the transmission by selectively engaging the plurality of torque transmitting devices, wherein the transmission controller includes control logic comprising; a first control logic for controlling the transmission using the first signal of the first sensor; a second control logic for performing a diagnostic check on the first sensor; a third control logic for determining whether the diagnostic check of the second control logic indicates that the first sensor meets a predefined performance characteristic; a fourth control logic for instructing the transmission controller to use the second signal of the second sensor to control the transmission if the third control logic indicates that the first sensor does not meet the predefined performance characteristic; and a fifth control logic for controlling the transmission using the second signal of the second sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a transmission of a motor vehicle, the method comprising the steps of:
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receiving a first signal from a first sensor that is configured to output the first signal to indicate a rotational speed of an input shaft of the transmission; processing the first signal with a transmission controller; commanding a plurality of torque transmitting devices using the first signal to establish a plurality of speed ratios between the input shaft and an output shaft of the transmission; performing a diagnostic check on the first sensor; determining whether the diagnostic check indicates that the first sensor meets a predefined performance characteristic; instructing the transmission controller to use a second signal of a second sensor to control the transmission if the diagnostic check indicates that the first sensor does not meet the predefined performance characteristic, wherein the second sensor is configured to output the second signal that indicates a speed of a prime mover interconnected with the transmission input shaft; and commanding the plurality of torque transmitting devices using the second signal when the diagnostic check indicates that the first sensor does not meet the predefined performance characteristic. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification