Vehicle speed sensor with bus interface for vehicle

Abstract

The invention relates to a speed sensor with a bus interface for an automobile, and belongs to the automobile electronic control technology field. The speed sensor comprises the sensor for convertingthe measured speed signal to the square wave voltage signal Ui; an amplitude limiting square wave generating circuit for receiving the output voltage signal of the sensor, converting into the square wave signal and carrying out the output; and a micro-processing unit with a bus communication module, wherein the micro-processing unit is used for carrying out the unit time counting of the received square wave signal Uo, converting the counting result to the value of the corresponding measured speed signal, carrying out the information frame coding of the value of the measured speed signal according to the transfer protocol, carrying out the conversion of the level signal of the information frame code according to the automobile bus protocol and sending the converted signal to the bus interface. The speed sensor can simplify the control of an automobile electric system, optimize the wire harness, save the space, carry out the real-time detection of the speed, convert the result to the digital signal and send to a communication bus through a bus interface.

Description

technical field [0001] The invention relates to a vehicle speed sensor with a bus interface for automobiles, belonging to the technical field of automobile electronic control. Background technique [0002] In the traditional automobile body electrical system, the sensor output signal of the car is directly connected to the signal receiver. When the same sensor signal is to be sent to multiple receivers, it is necessary to lead out multiple wires to connect to these receivers respectively. This connection method The wire connection in the vehicle is complicated, the space occupied is large, and the cost of the wiring harness is high. [0003] In the electrical system of modern automobile body, bus technology is applied more and more. For vehicles using bus technology, the output signal of the sensor is no longer directly connected to the receiver, but the sensor signal is converted into a digital signal by the controller and sent to the communication bus, and the receiver mo...

AI Technical Summary

Problems solved by technology

[0002] In the traditional automobile body electrical system, the sensor output signal of the car is directly connected to the signal receiver. When the same sensor signal is to be sent to multiple receivers, it is necessary to lead out multiple wires to connect to these receivers respectively. This connection method Complicated connection of wires in the car, large space occupation and high cost of wiring harness

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