Method and system for vehicle suspension system
First Claim
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1. A method for a vehicle, comprising:
- determining tire pressure measurements from a sensor, the sensor coupled to a vehicle tire;
determining acceleration measurements from the sensor; and
inferring a state of health of a shock absorber, the shock absorber coupled to the vehicle tire, based on the determined tire pressure and acceleration measurements from the sensor, including;
acquiring the acceleration measurements over a duration in response to the tire pressure measurements being greater than a threshold pressure;
estimating an oscillatory behavior of the vehicle tire based on the acceleration measurements acquired over the duration and the tire pressure measurements;
indicating degradation of the shock absorber responsive to the estimated oscillatory behavior being greater than a threshold, the threshold calibrated based on an oscillatory behavior history; and
indicating a remaining life of the shock absorber responsive to the estimated oscillatory behavior being less than the threshold, the remaining life of the shock absorber estimated based on the estimated oscillatory behavior, the oscillatory behavior history, and drive statistics of the vehicle, the remaining life of the shock absorber being a time of vehicle operation or a distance of vehicle travel before shock absorber degradation is expected.
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Abstract
Methods and systems are provided for diagnosing a shock absorber coupled to a vehicle tire. In one example, a sensor of a tire pressure measurement system coupled inside a tire is used to measure a tire pressure as well as an oscillatory behavior of the tire. A state of health of a shock absorber coupled to the tire is estimated based on the oscillatory behavior.
31 Citations
16 Claims
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1. A method for a vehicle, comprising:
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determining tire pressure measurements from a sensor, the sensor coupled to a vehicle tire; determining acceleration measurements from the sensor; and inferring a state of health of a shock absorber, the shock absorber coupled to the vehicle tire, based on the determined tire pressure and acceleration measurements from the sensor, including; acquiring the acceleration measurements over a duration in response to the tire pressure measurements being greater than a threshold pressure; estimating an oscillatory behavior of the vehicle tire based on the acceleration measurements acquired over the duration and the tire pressure measurements; indicating degradation of the shock absorber responsive to the estimated oscillatory behavior being greater than a threshold, the threshold calibrated based on an oscillatory behavior history; and indicating a remaining life of the shock absorber responsive to the estimated oscillatory behavior being less than the threshold, the remaining life of the shock absorber estimated based on the estimated oscillatory behavior, the oscillatory behavior history, and drive statistics of the vehicle, the remaining life of the shock absorber being a time of vehicle operation or a distance of vehicle travel before shock absorber degradation is expected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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estimating an oscillatory behavior of a tire in a vehicle based on selected accelerations of the tire sensed over a duration via a tire pressure sensor and a tire pressure measured by the tire pressure sensor, the selected accelerations selected responsive to the tire pressure being within a selected pressure range including the tire pressure greater than a threshold tire pressure setting; indicating degradation of a shock absorber coupled to the tire responsive to the estimated oscillatory behavior being greater than a threshold, the threshold calibrated based on an oscillatory behavior history, wherein the shock absorber coupled to the tire is separate from the tire pressure sensor; adjusting an active suspension system of the vehicle in response to the degradation; and indicating a remaining life of the shock absorber responsive to the estimated oscillatory behavior being less than the threshold, the remaining life of the shock absorber estimated based on the estimated oscillatory behavior, the oscillatory behavior history, and drive statistics of the vehicle, the remaining life of the shock absorber being a time of vehicle operation or a distance of vehicle travel before shock absorber degradation is expected. - View Dependent Claims (9, 10, 11)
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12. A method for a vehicle, comprising:
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determining tire pressure measurements from a sensor, the sensor coupled to a vehicle tire; determining acceleration measurements from the sensor; and inferring a state of health of a shock absorber, the shock absorber coupled to the vehicle tire, based on the determined tire pressure and acceleration measurements from the sensor, including; acquiring the acceleration measurements over a duration in response to the tire pressure measurements being greater than a threshold pressure; estimating an oscillatory behavior of the vehicle tire based on the acceleration measurements acquired over the duration, including determining frequency components of the acceleration measurements acquired over the duration and determining an average magnitude of the frequency components within a frequency range of interest, the frequency range of interest adjusted based on the tire pressure measurements; indicating degradation of the shock absorber responsive to the estimated oscillatory behavior being greater than a threshold, the threshold calibrated based on an oscillatory behavior history; and indicating a remaining life of the shock absorber responsive to the estimated oscillatory behavior being less than the threshold, the remaining life of the shock absorber estimated based on the estimated oscillatory behavior, the oscillatory behavior history, and drive statistics of the vehicle, the remaining life of the shock absorber being a time of vehicle operation or a distance of vehicle travel before shock absorber degradation is expected. - View Dependent Claims (13, 14, 15, 16)
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Specification