Hybrid system for vehicle with 4WD start mode
First Claim
1. A hybrid system for a vehicle having a first set of road wheels and a second set of road wheels, comprising:
- an engine controller for receiving a torque request for an engine driving torque (vRTRQe) and combining an idle speed torque and the engine driving torque (vRTRQe) to generate an engine torque command signal;
an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to the engine torque command signal;
a hybrid controller, in communication with the engine controller, for generating the torque request and a motor torque command signal taking into account a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels and a desired driving torque (tTRQ1) during starting the vehicle from standstill; and
a motor drivingly coupled with the second set of road wheels to apply a second driving torque to the second set of road wheels in response to the motor torque command signal.
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Accused Products
Abstract
A hybrid system or a control method for a vehicle having a first set of road wheels and a second set of road wheels is disclosed. The system comprises an engine controller for receiving a torque request for an engine driving torque and combining an idle speed torque and the engine driving torque to generate an engine torque command signal. An engine, drivingly coupled with the first set of road wheels, applies a first driving torque to the first set of road wheels in response to the engine torque command signal. A hybrid controller is in communication with the engine controller. The hybrid controller generates the torque request and a motor torque command signal taking into account a creep torque portion of the first driving torque and a desired driving torque during starting the vehicle from standstill. A motor is drivingly coupled with the second set of road wheels. The motor applies a second driving torque to the second set of road wheels in response to the motor torque command signal.
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Citations
26 Claims
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1. A hybrid system for a vehicle having a first set of road wheels and a second set of road wheels, comprising:
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an engine controller for receiving a torque request for an engine driving torque (vRTRQe) and combining an idle speed torque and the engine driving torque (vRTRQe) to generate an engine torque command signal;
an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to the engine torque command signal;
a hybrid controller, in communication with the engine controller, for generating the torque request and a motor torque command signal taking into account a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels and a desired driving torque (tTRQ1) during starting the vehicle from standstill; and
a motor drivingly coupled with the second set of road wheels to apply a second driving torque to the second set of road wheels in response to the motor torque command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for controlling a vehicle having a first set of road wheels, a second set of road wheels and a drivetrain, the drivetrain including an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to an engine torque command signal, and a motor drivingly coupled with the second set of road wheels to apply a second driving torque to the second set of road wheels in response to a motor torque command signal, the control method comprising:
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receiving a torque request for an engine driving torque and combining an idle speed torque and the engine driving torque to generate the engine torque command signal; and
generating the torque request and the motor torque command signal taking into account a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels and a desired driving torque (tTRQ1) during starting the vehicle from standstill.
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24. A hybrid system for a vehicle having a first set of road wheels and a second set of road wheels, comprising:
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first controller means for receiving a torque request for an engine driving torque (vTRQe) and combining an idle speed torque and the engine driving torque (vTRQe) to generate an engine torque command signal;
an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to the engine torque command signal;
second controller means, in communication with the first controller means, for generating the torque request and a motor torque command signal taking into account a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels and a desired driving torque (tTRQ1) during starting the vehicle from standstill; and
a motor drivingly coupled with the second set of road wheels to apply a second driving torque to the second set of road wheels in response to the motor torque command signal.
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25. A method for controlling a vehicle having a first set of road wheels, a second set of road wheels and a drivetrain, the drivetrain including an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to an engine torque command signal, and a motor drivingly coupled with the second set of road wheels to apply a second driving torque to the second set of road wheels in response to a motor torque command signal, the control method comprising:
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determining a desired driving torque (tTRQ1);
determining a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels;
comparing the desired driving torque (tTRQ1) to a threshold established based on the creep torque portion (CREEP_TRQ);
subtracting the creep torque portion (CREEP_TRQ) from the desired driving torque (tTRQ1) to give a modified desired driving torque (tTRQ2);
setting the modified desired driving torque (tTRQ2) as an intermediate motor driving torque (vFTRQint) when the desired driving torque (tTRQ1) is not greater than the threshold;
setting a predetermined percentage of the desired driving torque (tTRQ1) as the intermediate motor driving torque (vFTRQint) when the desired driving torque (tTRQ1) exceeds the threshold;
reducing the intermediate motor driving torque (vFTRQint) toward zero to give a motor driving torque (vFTRQ) upon a predetermined condition being fulfilled after starting the vehicle;
subtracting the motor driving torque (vFTRQ) from the modified desired engine torque (tTRQ2) to give an engine/motor driving torque (vRTRQ);
determining the motor torque command signal in response to the motor driving torque (vFTRQ); and
determining the engine torque command signal in response to the engine/motor driving torque (vRTRQ).
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26. A computer readable storage medium having stored therein data representing instructions executable by a computer to control a vehicle having a first set of road wheels, a second set of road wheels and a drivetrain, the drivetrain including an engine drivingly coupled with the first set of road wheels to apply a first driving torque to the first set of road wheels in response to an engine torque command signal, and a motor drivingly coupled with the second set of road wheels, the computer readable storage medium comprising:
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instructions for determining a creep torque portion (CREEP_TRQ) of the first driving torque applied to the first set of road wheels;
instructions for generating a torque request for an engine driving torque (vRTRQe) and a motor torque command signal taking into account the determined creep torque portion (CREEP_TRQ) and a desired driving torque (tTRQ1) during starting the vehicle from standstill; and
instructions for applying the motor torque command signal to the motor, causing the motor to apply a second driving torque to the second set of road wheels.
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Specification