VEHICLE TORQUE MONITORING SYSTEM
First Claim
1. A control system for a hybrid vehicle having a power transfer unit adapted to drive a vehicle wheel and a power source adapted to drive the power transfer unit, the system comprising:
- a local torque monitor associated with the power source and adapted to implement a local torque mitigation strategy to inhibit undesired torque; and
a vehicle level torque monitor adapted to implement a vehicle level torque mitigation strategy to inhibit acceleration of the hybrid vehicle if the local torque mitigation strategy does not successfully inhibit undesired torque.
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Accused Products
Abstract
A distributed torque monitoring and control system for a hybrid vehicle. The hybrid vehicle has a power transfer unit adapted to drive a vehicle wheel and a power source adapted to drive the power transfer unit. The system includes a local torque monitor and a vehicle level torque monitor. The local torque monitor is associated with the power source and is adapted to implement a local mitigation strategy to inhibit undesired torque. The vehicle level torque monitor is adapted to implement a vehicle level mitigation strategy to inhibit acceleration of the hybrid vehicle if the local mitigation strategy is unsuccessful.
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Citations
20 Claims
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1. A control system for a hybrid vehicle having a power transfer unit adapted to drive a vehicle wheel and a power source adapted to drive the power transfer unit, the system comprising:
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a local torque monitor associated with the power source and adapted to implement a local torque mitigation strategy to inhibit undesired torque; and
a vehicle level torque monitor adapted to implement a vehicle level torque mitigation strategy to inhibit acceleration of the hybrid vehicle if the local torque mitigation strategy does not successfully inhibit undesired torque. - View Dependent Claims (2, 3, 4, 5)
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6. A method for monitoring and controlling torque in a hybrid vehicle, the hybrid vehicle having a power transfer unit adapted to drive a vehicle wheel, at least one power source adapted to provide a driving torque to the power transfer unit, a local torque monitor associated with the at least one power source, and a vehicle level torque monitor associated with the local torque monitor, the method comprising:
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calculating first and second torque values representing estimates of the driving torque;
determining whether the first and second torque values are within a limit range;
implementing a local torque mitigation strategy with the local torque monitor to inhibit undesired torque if the first and second torque values are not within the limit range; and
implementing a vehicle level torque mitigation strategy with the vehicle level torque monitor if the local torque mitigation strategy does not cause the first and second torque values to fall within the limit range in a set period of time. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for monitoring and controlling torque in a hybrid vehicle, the hybrid vehicle having a power transfer unit adapted to drive a vehicle wheel, a power source adapted to provide torque to the power transfer unit, a local torque monitor associated with the power source, a vehicle level torque monitor associated with the local torque monitor, and a vehicle system control unit adapted to receive commands from the vehicle level torque monitor and control the power source, the method comprising the steps of:
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determining first and second estimated torque values and implementing a local torque mitigation strategy with the local torque monitor to inhibit undesired torque if the first and second estimated torque values are not within a limit range;
implementing a vehicle level torque mitigation strategy if the local torque mitigation strategy does not cause the first and second estimated torque values to fall within the limit range in a set period of time, the vehicle level torque mitigation strategy including;
calculating an estimated wheel torque value indicative of a torque provided to the vehicle wheel and an upper limit value for estimated wheel torque value; and
implementing a torque control strategy if the estimated wheel torque value is greater than the upper limit value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification