Method for detecting operational state of a steering system
AssigneeSteering Solutions IP Holding Corporation
InventorSarin Kodappully
Life of this patent
Estimating the term…
Abstract
A method for performing roadwheel actuator (RWA) diagnosis to determine a RWA control capability status of a vehicle includes, using one or more processors, determining an expected cornering state of the vehicle by determining at least one of an expected yaw rate and an expected lateral acceleration of the vehicle, determining an actual cornering state of the vehicle, by determining at least one of an actual yaw rate and an actual lateral acceleration of the vehicle, determining a cornering state error based on the expected cornering state of the vehicle and the actual cornering state of the vehicle, determining the RWA control capability status based on the cornering state error, and controlling at least one function of the vehicle based on the RWA control capability status.
Claims18
A method for performing roadwheel actuator (RWA) diagnosis to determine a RWA control capability status of a vehicle, the method comprising, using one or more processors:
- determining an expected cornering state of the vehicle, wherein determining the expected cornering state includes determining at least one of an expected yaw rate and an expected lateral acceleration of the vehicle;
- determining an actual cornering state of the vehicle, wherein determining the actual cornering state includes determining at least one of an actual yaw rate and an actual lateral acceleration of the vehicle;
- determining a cornering state error based on the expected cornering state of the vehicle and the actual cornering state of the vehicle;
- determining the RWA control capability status based on the cornering state error, wherein determining the RWA control capability status includes, to perform the RWA diagnosis, (i) comparing the cornering state error to a cornering state error threshold, (ii) calculating the RWA control capability status as available in response to a determination that the cornering state error exceeds the cornering state error threshold, and (iii) calculating the RWA control capability status as unavailable in response to a determination that the cornering state error does not exceed the cornering state error threshold;
- and
- controlling at least one function of the vehicle based on the RWA control capability status.
A system for performing roadwheel actuator (RWA) diagnosis to determine a RWA control capability status of a vehicle, the system comprising:
- one or more sensors configured to determine one or more operating characteristics of a vehicle;
- and
- a processor configured to execute instructions stored in memory, wherein executing the instructions causes the processor to
- determine an expected cornering state of the vehicle, wherein determining the expected cornering state includes determining at least one of an expected yaw rate an expected lateral acceleration of the vehicle,
- determine, based on the one or more operating characteristics, an actual cornering state of the vehicle, wherein determining the actual cornering state includes determining at least one of an actual yaw rate and an actual lateral acceleration of the vehicle,
- determine a cornering state error based on the expected cornering state of the vehicle and the actual cornering state of the vehicle,
- determine the RWA control capability status based on the cornering state error, wherein determining the RWA control capability status includes, to perform the RWA diagnosis, (i) comparing the cornering state error to a cornering state error threshold, (ii) calculating the RWA control capability status as available in response to a determination that the cornering state error exceeds the cornering state error threshold, and (iii) calculating the RWA control capability status as unavailable in response to a determination that the cornering state error does not exceed the cornering state error threshold, and
- control at least one function of the vehicle based on the RWA control capability status.
A system for performing roadwheel actuator (RWA) diagnosis to determine a RWA control capability status of a vehicle, the system comprising:
- a processor configured to, using a steer-by-wire vehicle model, determine an expected cornering state of the vehicle, wherein determining the expected cornering state includes determining at least one of an expected yaw rate an expected lateral acceleration of the vehicle;
- an error calculation module configured to, based on the expected cornering state of the vehicle and an actual cornering state of the vehicle, a cornering state error, wherein the actual cornering state of the vehicle is based on at least one of an actual yaw rate and an actual lateral acceleration of the vehicle;
- and
- a status calculation module to determine and output the RWA control capability status based on the cornering state error, wherein determining the RWA control capability status includes, to perform the RWA diagnosis, (i) comparing the cornering state error to a cornering state error threshold, (ii) calculating the RWA control capability status as available in response to a determination that the cornering state error exceeds the cornering state error threshold, and (iii) calculating the RWA control capability status as unavailable in response to a determination that the cornering state error does not exceed the cornering state error threshold.
Dependencies are inferred from the claim text.