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US 9,218,695 B2Granted
System and method for monitoring an estimated wheel speed of a vehicle using a transmission output shaft sensor
AssigneeRobert Bosch GmbH
InventorZerong Yu
Life of this patent
Estimating the term…
Abstract
Methods and systems are described for monitoring a determined wheel speed of a wheel. A three wheel speed values—each indicative of a measured wheel speed of a different wheel—are each received from a different wheel speed sensor. An estimated wheel speed value for a fourth wheel is determined based on at least one of the three wheel speed values. A calculated wheel speed value is determined based on information received from a vehicle system. A fault condition is detected based on deviations between the estimated wheel speed value for the fourth wheel and the calculated wheel speed value for the fourth wheel.
Claims16
A method of monitoring a determined wheel speed of a wheel, the method comprising:
- receiving a first wheel speed value from a first wheel speed sensor, the first wheel speed value being indicative a measured wheel speed of a first wheel of a vehicle;
- receiving a second wheel speed value from a second wheel speed sensor, the second wheel speed value being indicative of a measured wheel speed of a second wheel of the vehicle;
- receiving a third wheel speed value from a third wheel speed sensor, the third wheel speed value being indicative of a measured wheel speed of a third wheel of the vehicle;
- determining an estimated wheel speed value for a fourth wheel of the vehicle based on at least two values selected from a group consisting of the first wheel speed value, the second wheel speed value, and the third wheel speed value;
- determining a calculated wheel speed value for the fourth wheel based on information received from a transmission output speed sensor;
- and
- determining that a fault condition exists based on deviations between the estimated wheel speed value for the fourth wheel and the calculated wheel speed value for the fourth wheel;
- wherein the estimated and calculated wheel speed values for the fourth wheel do not include any direct measurement of a wheel speed of the fourth wheel.
5 more elements
A wheel-speed monitoring system comprising:
- a first wheel speed sensor;
- a second wheel speed sensor;
- a third wheel speed sensor;
- a processor;
- and
- a memory storing instructions that, when executed by the processor, cause the wheel-speed monitoring system to
- receive a first wheel speed value from the first wheel speed sensor, the first wheel speed value being indicative a measured wheel speed of a first wheel of a vehicle,
- receive a second wheel speed value from the second wheel speed sensor, the second wheel speed value being indicative of a measured wheel speed of a second wheel of the vehicle,
- receive a third wheel speed value from the third wheel speed sensor, the third wheel speed value being indicative of a measured wheel speed of a third wheel of the vehicle,
- determine an estimated wheel speed value for a fourth wheel of the vehicle based on at least two values selected from the group consisting of the first wheel speed value, the second wheel speed value, and the third wheel speed value,
- determine a calculated wheel speed value for the fourth wheel based on information received from a transmission output speed sensor, and
- determine that a fault condition exists based on deviations between the estimated wheel speed value for the fourth wheel and the calculated wheel speed value for the fourth wheel;
- wherein the estimated and calculated wheel speed values for the fourth wheel do not include any direct measurement of a wheel speed of the fourth wheel.
10 more elements
A wheel-speed monitoring system comprising a processor and a memory, the memory storing instructions that, when executed by the processor, cause the wheel-speed monitoring system to:
- receive a first wheel speed value from a first wheel speed sensor, the first wheel speed value being indicative a measured wheel speed of a first wheel of a vehicle;
- receive a second wheel speed value from a second wheel speed sensor, the second wheel speed value being indicative of a measured wheel speed of a second wheel of the vehicle;
- receive a third wheel speed value from a third wheel speed sensor, the third wheel speed value being indicative of a measured wheel speed of a third wheel of the vehicle;
- determine a plurality of estimated wheel speed values for a fourth wheel of the vehicle, wherein each estimated wheel speed value of the plurality of estimated wheel speed values is determined according to a different estimation mechanism based on at least two value selected from the group consisting of the first wheel speed value, the second wheel speed value, and the third wheel speed value;
- determine a calculated wheel speed value for the fourth wheel based on information received from a transmission output speed sensor;
- calculate a plurality of deviation values, wherein each deviation value is based on a difference between one of the plurality of estimated wheel speed values and the calculated wheel speed value for the fourth wheel;
- compare each deviation value of the plurality of deviation values to a deviation threshold;
- determine a number of deviation values of the plurality of deviation values that exceed the deviation threshold;
- and
- determine that a fault condition exists when the number of deviation values of the plurality of deviation values that exceed the deviation threshold exceeds a deviation quantity threshold for a defined period of time;
- wherein the estimated and calculated wheel speed values for the fourth wheel do not include any direct measurement of a wheel speed of the fourth wheel.
8 more elements
Dependencies are inferred from the claim text.