Automobile sensor with bus interface

A bus interface and sensor technology, applied in the field of sensors, can solve the problems of large space occupation, high cost of wiring harness, complicated wire connection in the car, etc., and achieve the effect of space saving, simple control and optimization of wiring harness

Inactive Publication Date: 2009-01-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Automobile sensor with bus interface
  • Automobile sensor with bus interface
  • Automobile sensor with bus interface

Examples

Experimental program
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Embodiment Construction

[0022] The sensor with a bus interface for automobiles proposed by the present invention has a circuit block diagram such as figure 1 Shown, including:

[0023] Sensor, used to convert the measured physical signal into a resistance signal, and the resistance signal U i Output to the bridge circuit, the sensor is a variable resistor R x One end of the variable resistor is connected to the ground signal, and the other end is connected to the bridge circuit. During operation, its resistance value changes with the change of the measured signal.

[0024] Bridge circuit, used to receive the output signal U of the variable resistance sensor i , Produce differential signal U b1 And U b2 And output to the first follower circuit. The circuit principle of the bridge circuit is as figure 2 As shown, there are four resistors R b1 , R b2 , R b3 , R b4 Composition, connected by electric bridge. Resistance R b1 One end is connected to the digital electric signal Vcc, one end is connected to R b...

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Abstract

The invention relates to a sensor with a bus interface for an automobile and belongs to the technical field of automobile electronic control, comprising a sensor that converts a measured signal to a resistance signal; a bridge circuit that generates a differential signal from the sensor signal; a first follower circuit that follows the differential signal; a differential amplifier circuit that differentially amplifies the signal; a filter circuit that filters the signal; a second follower circuit that follows the filter signal; a protection circuit that limits current and pressure of the signal; a microprocessor unit, which has a bus communication module and converts the modulus of a read signal, encodes the information frame of a physical signal according to a transport protocol, converts a level signal of the information frame code according to an automobile bus protocol, and at last sends the converted level signal to the bus interface. The sensor of the invention can detect the measured and output signal of the sensor in real time, convert the result to a digital signal and then send the signal to the communication bus by the bus interface.

Description

Technical field [0001] The invention relates to a sensor with a bus interface for automobiles, and belongs to the technical field of automobile electronic control. Background technique [0002] In the traditional car 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, multiple wires need to be drawn to connect to these receivers. This connection method As a result, the wire connection in the vehicle is complicated, the space is large, and the wiring harness cost is high. [0003] In modern automobile body electrical systems, bus technology is increasingly being used. For automobiles 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 through the controller and sent to the communication bus, and the receiver monitors the required sensor signal from the commu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R16/02G01D5/16
Inventor 连小珉杨殿阁陆良张新丰薛雯罗禹贡李克强郑四发王建强
Owner TSINGHUA UNIV
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