Traction control system for a hybrid electric vehicle
First Claim
1. An electric motor system to reduce drive wheel torque in a hybrid electric vehicle comprising:
- an internal combustion engine located in said hybrid electric vehicle, said internal combustion engine generating an engine torque;
an electric motor located in said hybrid electric vehicle and coupled to said internal combustion engine, said electric motor generating electric motor torque;
a transmission located in said hybrid electric vehicle and coupled to said internal combustion engine and said electric motor, said transmission receiving said engine torque and said electric motor torque, said transmission generating drive wheel torque on a drive wheel; and
a vehicle system controller located in said hybrid electric vehicle and coupled to said electric motor, said vehicle system controller including control logic operative to sense a traction control event and reduce said drive wheel torque by reducing said electric motor torque, wherein said electric motor torque during said traction control event is defined by
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Accused Products
Abstract
An electric motor system for reducing drive wheel torque on a hybrid electric vehicle includes an internal combustion engine, an electric motor, a transmission, and a controller. The internal combustion engine is located in the hybrid electric vehicle and generates an engine torque. The electric motor is coupled to the internal combustion engine and generates and electric motor torque. Both the engine and motor are coupled to the transmission that uses the combined torque from both the engine and motor to generate drive wheel torque on a drive wheel. The vehicle system controller is coupled to the electric motor and senses any traction control events. When a traction control event occurs the controller commands the electric motor to reduce the drive wheel torque by reducing the electric motor torque.
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Citations
7 Claims
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1. An electric motor system to reduce drive wheel torque in a hybrid electric vehicle comprising:
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an internal combustion engine located in said hybrid electric vehicle, said internal combustion engine generating an engine torque;
an electric motor located in said hybrid electric vehicle and coupled to said internal combustion engine, said electric motor generating electric motor torque;
a transmission located in said hybrid electric vehicle and coupled to said internal combustion engine and said electric motor, said transmission receiving said engine torque and said electric motor torque, said transmission generating drive wheel torque on a drive wheel; and
a vehicle system controller located in said hybrid electric vehicle and coupled to said electric motor, said vehicle system controller including control logic operative to sense a traction control event and reduce said drive wheel torque by reducing said electric motor torque, wherein said electric motor torque during said traction control event is defined by
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2. An electric motor system to reduce drive wheel torque in a hybrid electric vehicle comprising:
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an internal combustion engine located in said hybrid electric vehicle, said internal combustion engine generating an engine torque;
an electric motor located in said hybrid electric vehicle and coupled to said internal combustion engine, said electric motor generating electric motor torque;
a transmission located in said hybrid electric vehicle and coupled to said internal combustion engine and said electric motor, said transmission receiving said engine torque and said electric motor torque, said transmission generating drive wheel torque on a drive wheel; and
a vehicle system controller located in said hybrid electric vehicle and coupled to said electric motor, said vehicle system controller including control logic operative to sense a traction control event and reduce said drive wheel torque by reducing said electric motor torque, wherein said engine torque during said traction control event is defined by Te — red(tp)=Tm— act−
Tm.
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3. A traction control system comprising:
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a hybrid electric vehicle having an electric motor system for reducing torque to a drive wheel, said electric motor system comprising;
an internal combustion engine located in said hybrid electric vehicle, said internal combustion engine generating an engine torque;
an electric motor located in said hybrid electric vehicle and coupled to said internal combustion engine, said electric motor generating electric motor torque;
a transmission located in said hybrid electric vehicle and coupled to said internal combustion engine and said electric motor, said transmission receiving said engine torque and said electric motor torque, said transmission generating drive wheel torque on a drive wheel; and
a vehicle system controller located in said hybrid electric vehicle and coupled to said electric motor, said vehicle system controller including control logic operative to sense a traction control event and reduce said drive wheel torque by reducing said electric motor torque, wherein said electric motor torque during said traction control event is defined by
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4. A traction control system comprising:
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a hybrid electric vehicle having an electric motor system for reducing torque to a drive wheel, said electric motor system comprising;
an internal combustion engine located in said hybrid electric vehicle, said internal combustion engine generating an engine torque;
an electric motor located in said hybrid electric vehicle and coupled to said internal combustion engine, said electric motor generating electric motor torque;
a transmission located in said hybrid electric vehicle and coupled to said internal combustion engine and said electric motor, said transmission receiving said engine torque and said electric motor torque, said transmission generating drive wheel torque on a drive wheel; and
a vehicle system controller located in said hybrid electric vehicle and coupled to said electric motor, said vehicle system controller including control logic operative to sense a traction control event and reduce said drive wheel torque by reducing said electric motor torque, wherein said engine torque during said traction control event is defined by Te — red(tp)=Tm— act−
Tm.
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5. A method of reducing torque to a drive wheel for a hybrid electric vehicle, said method comprising the steps of:
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generating an engine torque;
generating electric motor torque;
generating drive wheel torque on a drive wheel, said drive wheel torque being approximately the sum of said engine torque and said electric motor torque by a factor of a transmission gear ratio and final drive ratio;
sensing a traction control event; and
reducing said drive wheel torque by reducing said electric motor torque. - View Dependent Claims (6, 7)
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Specification