An electronic odometer sensor for a commercial vehicle

Abstract

The invention discloses an electronic type odometer sensor for a commercial vehicle. The electronic type odometer sensor for the commercial vehicle comprises a power supply module and a Hall induction module which is used for inducing field intensity variation generated by the rotation of an induction target wheel, wherein the power supply module is connected with the Hall induction module; the output end of the Hall induction module is connected with a signal processing module and the output end of the signal processing module is used as an output driving module to be connected with a whole vehicle instrument; a high-resolution field intensity peak value detection unit is arranged in a Hall induction IC and an overturning threshold point of the Hall induction IC can be determined in a self-adaptive manner, so that the field intensity variation of a tooth crest and a tooth root, caused by the Hall induction IC under the condition that the target wheel is eccentric, can be accurately induced, and the precision and the accuracy of the sensor are improved; and meanwhile, the Hall induction IC is internally provided with a low pass filter so that the interference rejection of the Hall induction IC is improved.

Description

technical field [0001] The invention belongs to the field of vehicle sensors, in particular to an electronic odometer sensor for commercial vehicles. Background technique [0002] At present, the domestic commercial vehicle market still generally uses the mechanical active and passive wheel structure odometer sensor of early technology. Compared with the electronic odometer sensor, this sensor has a simple structure and low cost, but due to mechanical wear caused by long-term mechanical transmission, This kind of wear will lead to inaccurate sensing of the sensor, and in serious cases will lead to direct failure of the sensor, and the vehicle's instrument will have no speed display. With the development of electronic technology, switching the non-contact electronic odometer sensor is the trend of market development. [0003] The working principles of electronic odometer sensors are generally divided into two types, Hall-type inductive type and coil-type inductive type. The ...

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Problems solved by technology

[0002] At present, the domestic commercial vehicle market still generally uses the mechanical active and passive wheel structure odometer sensor of early technology. Compared with the electronic odometer sensor, this sensor has a simple structure and low cost, but due to mechanical wear caused by long-term mechanical transmission, This kind of wear will lead to inaccurate sensing of the sensor, and in serious cases will lead to direct failure of the sensor, and the vehicle's instrument will have no speed display. With the development of electronic technology, switching the non-contact electronic odometer sensor is the trend of market development

[0003] The working principles of electronic odometer sensors are generally divided into two types, Hall-type inductive type and coil-type inductive type. The working essence of both is to stimulate analog signals through electromagnetic induction. The technical threshold of this kind of components is low, and there are many manufacturers, but the components currently produced are difficult to meet the requirements of commercial vehicles in terms of technical indicators such as temperature and vibration; the coil structure is simple, and can be directly purchased from the market or processed by itself. It directly determines the reliability and accuracy of its induction. At present, the manufacturers of electronic odometer sensors are involved in both structures. However, judging from the current market response, neither of them has achieved a good performance in the use environment of commercial vehicles. Effect

[0004] At present, most of the odometer sensors on the market use Hall-type sensitive elements. The Hall switch in this sensor passes through the set B during operation. OP (Operate Point) and B RP (Release Point release point) Judging the change of the field strength produces a signal reversal, but due to external disturbance factors such as vehicle vibration, ambient temperature, electromagnetic interference, etc., may cause disturbance to the field strength sensed by the sensitive element, resulting in sensor failure, and the instrument displays Inaccurate, there is an error in the accumulated mileage

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