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Brake pad wear sensor

A brake pad, wear amount technology, applied in the direction of brakes, brake types, brake components, etc., can solve problems such as expensive, expensive solutions, prone to road debris, etc.

Inactive Publication Date: 2019-06-28
TRW AUTOMOTIVE US LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multiple wiring harnesses and additional sensing modules required make this an expensive solution
Routing harnesses through vehicle suspension and wheel / knuckle areas can be very challenging and prone to road debris hazards
Also, the wear sensor has to be replaced every time the pads are changed, which can be expensive

Method used

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  • Brake pad wear sensor
  • Brake pad wear sensor
  • Brake pad wear sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] refer to figure 1 , the example vehicle suspension system 10 includes an upper control arm 12 and a lower control arm 14 connected to a vehicle 16 for pivotal movement. A knuckle 20 is connected to the free ends of the control arms 12, 14 by a ball joint or the like allowing relative movement between the knuckle and the control arm. The knuckle 20 includes a shaft 22 that supports a hub 24 for rotation about an axle 26 (see arrow A). Wheel or rim 30 and tire 32 may be mounted on hub 24 by known means such as lugs and lug nuts. Hub 24 includes bearings 34 that facilitate rotation of the hub, rim 30 and tire 32 about axis 26 . The steering knuckle 20 itself is rotatable about a steering axis 36 (see arrow B) in order to steer the vehicle 16 in a known manner.

[0036] A damper 40 such as a shock absorber or strut has a piston rod 42 connected to the lower control arm 14 and a cylinder 44 supported by structure of the vehicle 16 such as a frame mounting bracket. Damper...

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PUM

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Abstract

A brake pad wear measuring system for measuring brake pad wear for a vehicle disc brake system includes a first coil having a first coil face and is excitable to create a first magnetic field. A firsttarget is spaced a fixed distance from the first coil face. The first coil and the first target are configured for movement relative to each other in response to application of the disc brake systemso that the first target covers a portion of the first coil that varies with the amount of brake pad wear and varies the inductance of the first coil. The inductance of the first coil is indicative ofthe amount of brake pad wear. The brake pad wear measuring system also includes a second coil having a second coil face and is excitable to create a second magnetic field. A second target is configured to move toward the second coil face in response to application of the disc brake system so that the distance between the second target and the second coil face varies with the amount of brake pad wear and varies the inductance of the second coil. The inductance of the second coil is indicative of the amount of brake pad wear.

Description

[0001] related application [0002] This application claims the benefit of US Provisional Application Serial No. 62 / 408,901, filed October 17, 2016. The disclosure in this application is hereby incorporated by reference in its entirety. technical field [0003] The present invention generally relates to brake pad wear sensing systems and apparatus. More specifically, the present invention relates to brake pad wear sensors that measure wear in both inner and outer brake pads of a disc brake system. Background technique [0004] It is desirable to sense and notify the driver when a motor vehicle brake pad needs to be replaced. Known electronic brake wear sensors have a resistor circuit sensor clamped to the inner brake pad. As the pads are worn by the rotor, the sensor is also worn, changing its resistance. A pigtail harness is connected to a sensor that is connected to a sensing module in the vehicle. [0005] There are several problems with known methods. The multiple ...

Claims

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Application Information

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IPC IPC(8): F16D66/02B60T17/22G01B7/00G01L5/28
CPCB60T17/22F16D66/023F16D66/025F16D66/028G01B7/107B60T17/221F16D66/027F16D2066/006G01M17/007
Inventor 林星平
Owner TRW AUTOMOTIVE US LLC