System and method for correcting brake knockback in a vehicle
First Claim
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1. A system for correcting brake knockback in a vehicle, comprising:
- a sensor having an output that provides a lateral acceleration signal, the lateral acceleration signal includes information regarding a lateral acceleration of the vehicle;
an electronic module having an input coupled to the sensor output, an electronic processing device, an electronic memory device, and an output that provides a command signal; and
a hydraulic pump for pressurizing hydraulic fluid in a vehicle disk brake system according to the command signal in order to correct brake knockback, wherein the electronic module is configured to;
use the lateral acceleration signal to identify a first lateral acceleration extremity in a first direction, use the lateral acceleration signal to identify a second lateral acceleration extremity in a second direction, add a brake knockback associated with the first lateral acceleration extremity to a brake knockback associated with the second lateral acceleration extremity to estimate a total brake knockback, and generating the command signal based on the total brake knockback.
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Abstract
A system and method for correcting brake knockback in a vehicle disk brake system. Brake knockback can occur when a vehicle is driven through an aggressive turn or in other environments that exert a significant amount of lateral force on the vehicle'"'"'s wheels. This can cause the rotors to deflect and push brake pistons into retracted positions, where they remain even after the vehicle exits the turn. According to one embodiment, the present method first estimates or predicts brake knockback by using lateral acceleration readings from the vehicle and a brake knockback model, and then corrects brake knockback by generating command signals for a hydraulic pump.
20 Citations
19 Claims
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1. A system for correcting brake knockback in a vehicle, comprising:
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a sensor having an output that provides a lateral acceleration signal, the lateral acceleration signal includes information regarding a lateral acceleration of the vehicle; an electronic module having an input coupled to the sensor output, an electronic processing device, an electronic memory device, and an output that provides a command signal; and a hydraulic pump for pressurizing hydraulic fluid in a vehicle disk brake system according to the command signal in order to correct brake knockback, wherein the electronic module is configured to;
use the lateral acceleration signal to identify a first lateral acceleration extremity in a first direction, use the lateral acceleration signal to identify a second lateral acceleration extremity in a second direction, add a brake knockback associated with the first lateral acceleration extremity to a brake knockback associated with the second lateral acceleration extremity to estimate a total brake knockback, and generating the command signal based on the total brake knockback. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for correcting brake knockback in a vehicle, comprising the steps of:
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(a) receiving lateral acceleration readings that are representative of a lateral acceleration of the vehicle, and using the lateral acceleration readings to determine a first lateral acceleration extremity that is representative of the greatest lateral acceleration experienced by the vehicle in a first direction and a second lateral acceleration extremity that is representative of the greatest lateral acceleration experienced by the vehicle in a second direction; (b) comparing the first and second lateral acceleration extremities to a brake knockback model, and estimating a total brake knockback based on the results of this comparison; and (c) generating a command signal for a hydraulic pump based on the estimated total brake knockback, wherein the hydraulic pump works with a disk brake system on the vehicle to correct brake knockback. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for correcting brake knockback in a vehicle, comprising the steps of:
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(a) receiving lateral acceleration readings that are representative of a lateral acceleration of the vehicle, and evaluating the lateral acceleration readings to determine a lateral acceleration extremity that is representative of a lateral acceleration experienced by the vehicle and is saved in an electronic memory; (b) comparing the saved lateral acceleration extremity to a brake knockback model, and estimating a brake knockback based on the results of this comparison; (c) using the estimated brake knockback to generate a command signal for a hydraulic pump, wherein the hydraulic pump works with a disk brake system on the vehicle to correct brake knockback; and (d) detecting a subsequent braking event during which it is assumed that there is no brake knockback, clearing the saved lateral acceleration extremity from the electronic memory in response to the subsequent braking event, and evaluating additional lateral acceleration readings after clearing the saved lateral acceleration extremity so that a new lateral acceleration extremity can be established.
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Specification