PAYLOAD ESTIMATION USING ELECTRIC POWER STEERING SIGNALS
First Claim
1. A payload estimation system of an electric power steering (EPS) system comprising:
- a payload detection module configured to detect payload according to a plurality of EPS signals and generate an axle load factor, the payload detection module comprising;
a rack torque module configured to determine a rack torque acting on a rack connected with the EPS;
a reference model module configured to determine a reference rack torque for the EPS based on a load scale factor; and
a load factor calculation module configured to compute an axle load factor based on a difference between the rack torque and the reference rack torque;
a blend factor module configured to determine a load blend factor according to the axle load factor; and
a signal combiner configured to combine a blended nominal base assist and a blended highload base assist according to the load blend factor, the combination modifying a motor torque command, the motor torque command being sent to a motor to generate assist torque.
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Accused Products
Abstract
Technical solutions are described for a payload detection module that detects payload using one or more steering system control signals and generates an axle load factor. An example payload detection module includes a rack torque module to determine a rack torque, a reference model module to determine a reference rack torque for the steering system based on a load scale factor, and a load factor calculation module to compute the axle load factor based on a difference between the rack torque and the reference rack torque. Further, a blend factor module determines a load blend factor according to the axle load factor. Further yet, a signal combiner combines a blended nominal base assist and a blended highload base assist according to the load blend factor, the combination modifying a motor torque command, the motor torque command being sent to a motor to generate assist torque.
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Citations
20 Claims
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1. A payload estimation system of an electric power steering (EPS) system comprising:
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a payload detection module configured to detect payload according to a plurality of EPS signals and generate an axle load factor, the payload detection module comprising; a rack torque module configured to determine a rack torque acting on a rack connected with the EPS; a reference model module configured to determine a reference rack torque for the EPS based on a load scale factor; and a load factor calculation module configured to compute an axle load factor based on a difference between the rack torque and the reference rack torque; a blend factor module configured to determine a load blend factor according to the axle load factor; and a signal combiner configured to combine a blended nominal base assist and a blended highload base assist according to the load blend factor, the combination modifying a motor torque command, the motor torque command being sent to a motor to generate assist torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of estimating a payload for maintaining a substantially consistent steering feel produced at least in-part by an electric power steering (EPS) system, the method comprising:
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receiving, by a payload detection module of a payload estimation system, a plurality of EPS signals to generate an additional axle load factor; determining, by a reference model module, a reference rack torque for the EPS based on a load scale factor; computing, by a load factor calculation module, an axle load factor based on a difference between the rack torque and the reference rack torque; determining, by a blend factor table of the payload estimation system, a load blend factor according to the additional axle load factor; and modifying, by a merge module, a motor torque command based on the load blend factor, the motor torque command being sent to a motor of the EPS to generate assist torque. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A steering system comprising:
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a rack torque module configured to determine a rack torque acting on a rack connected with the steering system; a reference model module configured to determine a reference rack torque for the steering system according to a plurality of control signals; a payload detection module configured to compute an axle load factor based on a difference between the rack torque and the reference rack torque; and a signal combiner configured to modify a motor torque command based on the axle load factor, the motor torque command being sent to a motor of the steering system to generate assist torque. - View Dependent Claims (17, 18, 19, 20)
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Specification