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

CN101353034AInactive Publication Date: 2009-01-28TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-01-28
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

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...