METHOD FOR MONITORING A MOTOR SPEED SENSOR
First Claim
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1. Method to monitor a powertrain system including a transmission device including an input member and a first sensor operative to monitor rotation of the input member, a plurality of torque machines and a corresponding plurality of rotational speed sensing devices, an output member, and first and second control modules, the method comprising:
- signally connecting the first sensor directly to the first control module and directly to the second control module;
signally connecting the rotational speed sensing devices directly to the second control module;
monitoring signal inputs from the first sensor in the first and second control modules;
monitoring signal inputs from the rotational speed sensing devices in the second control module;
determining a first rotational speed of the input member based upon the signal inputs from the first sensor;
determining a second rotational speed of the input member based upon the signal inputs from the first sensor;
determining rotational speeds of the torque machines based upon the signal inputs from the rotational speed sensing devices;
calculating a third rotational speed of the input member based upon the rotational speeds of the torque machines;
comparing the first rotational speed to the third rotational speed and comparing the second rotational speed to the third rotational speed; and
detecting an input speed fault when the third rotational speed differs from the first rotational speed by an amount greater than a first threshold and the third rotational speed differs from the second rotational speed by an amount greater than a second threshold.
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Abstract
A method for detecting speed faults in a hybrid powertrain having engine and electric machine speed inputs includes directly sensing the engine and machine speeds and performing comparisons of sensed engine speed with engine speed determined based upon the machine speeds.
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Citations
20 Claims
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1. Method to monitor a powertrain system including a transmission device including an input member and a first sensor operative to monitor rotation of the input member, a plurality of torque machines and a corresponding plurality of rotational speed sensing devices, an output member, and first and second control modules, the method comprising:
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signally connecting the first sensor directly to the first control module and directly to the second control module; signally connecting the rotational speed sensing devices directly to the second control module; monitoring signal inputs from the first sensor in the first and second control modules; monitoring signal inputs from the rotational speed sensing devices in the second control module; determining a first rotational speed of the input member based upon the signal inputs from the first sensor; determining a second rotational speed of the input member based upon the signal inputs from the first sensor; determining rotational speeds of the torque machines based upon the signal inputs from the rotational speed sensing devices; calculating a third rotational speed of the input member based upon the rotational speeds of the torque machines; comparing the first rotational speed to the third rotational speed and comparing the second rotational speed to the third rotational speed; and detecting an input speed fault when the third rotational speed differs from the first rotational speed by an amount greater than a first threshold and the third rotational speed differs from the second rotational speed by an amount greater than a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Method for monitoring a powertrain system including a transmission device operative to transmit torque between an input member, a plurality of torque generative devices, and an output member, the transmission device including a first sensor operative to monitor rotation of the input member, a second sensor operative to monitor rotation of the input member, and a plurality of sensing devices operative to monitor rotations of the torque generative devices, the first and second control modules operative to communicate therebetween, the method comprising:
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signally connecting the first sensor directly to the first control module; signally connecting the second sensor directly to the second control module; signally connecting the plurality of sensing devices directly to the second control module; monitoring signal inputs from the first sensor, the second sensor and the plurality of sensing devices into respectively connected ones of the first and second control modules; determining a first rotational speed of the input member based upon the signal input from the first sensor to the first control module; determining a second rotational speed of the input member based upon the signal input from the second sensor to the second control module; determining rotational speeds of the torque generative devices based upon signal inputs from the plurality of sensing devices to the second control module; calculating a third rotational speed of the input member based upon the rotational speeds of the torque generative devices; comparing the first rotational speed to the third rotational speed and comparing the second rotational speed to the third rotational speed; and detecting an input speed fault in one of the signal inputs from the sensing devices when the third rotational speed differs from the first rotational speed by an amount greater than a first threshold and the third rotational speed differs from the second rotational speed by an amount greater than a second threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification