System and method to detect malfunction in an electronic controlled hydraulic assistance steering system

A method for detecting a malfunction in a hydraulic-assisted steering system for a vehicle, comprising:

• measuring a steering torque;
• determining the steering torque exceeding a threshold torque for a predetermined length of time;
• generating a malfunction signal in response to the determining the steering torque exceeding the threshold torque for the predetermined length of time;
• measuring a vehicle speed of the vehicle;
• determining the vehicle speed exceeding a speed threshold;
• and
• adjusting at least one of the threshold torque and the predetermined length of time based on the determining the vehicle speed exceeding the speed threshold.

A method for detecting a malfunction in a hydraulic-assisted steering system for a vehicle, comprising:

• measuring a steering torque;
• determining the steering torque exceeding a threshold torque for a predetermined length of time;
• generating a malfunction signal in response to the determining the steering torque exceeding the threshold torque for the predetermined length of time;
• measuring a steering angular position of the hydraulic-assisted steering system;
• storing minimum and maximum values of the steering angular position as recorded minimum and maximum values;
• determining a steering angle range based on a difference between the recorded minimum and maximum values of the steering angular position;
• comparing the steering angle range to an angle range threshold value;
• and
• selectively inhibiting generating the malfunction signal in response to the comparing the steering angle range to the angle range threshold value.

A system for detecting a malfunction in a hydraulic-assisted steering system for a vehicle, comprising:

• a torque sensor configured to measure a steering torque;
• and
• a controller configured to:
• determine the steering torque exceeding a threshold torque for a predetermined length of time;
• and
• generate a malfunction signal in response to determining the steering torque exceeding the threshold torque for the predetermined length of time;
• determine at least one of:
• a steering angular position of the hydraulic-assisted steering system, a steering angle speed of the hydraulic-assisted steering system, or a temperature in the hydraulic-assisted steering system;
• determine at least one of:
• the steering angular position being less than an angular position threshold value, the steering angle speed being less than an angular speed threshold value, or the temperature in the hydraulic-assisted steering system being greater than a fluid temperature threshold value;
• and
• selectively enable generating the malfunction signal in response to the determining the at least one of:
• the steering angular position being less than the angular position threshold value, the steering angle speed being less than the angular speed threshold value, or the temperature in the hydraulic-assisted steering system being greater than the fluid temperature threshold value.

A system for detecting a malfunction in a hydraulic-assisted steering system for a vehicle, comprising:

• a torque sensor configured to measure a steering torque;
• and
• a controller configured to:
• determine the steering torque exceeding a threshold torque for a predetermined length of time;
• and
• generate a malfunction signal in response to determining the steering torque exceeding the threshold torque for the predetermined length of time;
• determine a vehicle speed exceeding a speed threshold;
• and
• adjust at least one of the threshold torque and the predetermined length of time based on the determining the vehicle speed exceeding the speed threshold.