CN203465556U

CN203465556U - General automotive switch acquisition system

Info

Publication number: CN203465556U
Application number: CN201320602959.3U
Authority: CN
Inventors: 单林永
Original assignee: NINGBO YINZHOU SUELIMAN ELECTRIC METER CO Ltd
Current assignee: NINGBO YINZHOU SUELIMAN ELECTRIC METER CO Ltd
Priority date: 2013-09-29
Filing date: 2013-09-29
Publication date: 2014-03-05
Anticipated expiration: 2023-09-29

Abstract

The utility model relates to an automotive switch acquisition system, and particularly relates to a general automotive switch acquisition system. The general automotive switch acquisition system comprises a single chip microcomputer, a plurality of switch signal acquisition circuits for acquiring signals of switches of different kinds, an analog to digital conversion circuit for converting the acquired switch signals into digital signals, a CAN communication circuit and a power supply circuit, wherein the switch signal acquisition circuits are in signal connection with the analog to digital conversion circuit; the analog to digital conversion circuit and the CAN communication circuit are both in signal connection with the single chip microcomputer; and the power supply circuit is electrically connected with the single chip microcomputer. With the automotive switch acquisition system, signals of switches of different kinds can be acquired.

Description

Universal automobile switch acquisition system

Technical field

The utility model relates to a kind of vehicle switch acquisition system, relates in particular to a kind of Universal automobile switch acquisition system.

Background technology

Electrical equipment on automobile is more and more at present, and the switch relating to is also more and more, and some switch only provides a make-and-break signal, and some switch provides the high-low signal of voltage, and some switch provides ground signalling.In the face of the acquisition tasks of various switching signals, prior art adopts different circuit to solve mostly, and such as make-and-break signal connects pull-up resistor in collecting cassette inside, high-low signal gathers etc. in the inner electric resistance partial pressure technology that adopts of collecting cassette.This technical design is more complicated, can not be general to dissimilar car, and also management difficulty is large, and reliability is lower.

Utility model content

Technical problem to be solved in the utility model is: a kind of Universal automobile switch acquisition system that can gather variety classes switching signal is provided, and this system is simple, can be general to dissimilar car, management difficulty is less and reliability is higher.

The technical scheme that the utility model adopts is: a kind of Universal automobile switch acquisition system, it comprises single-chip microcomputer, a plurality of for gathering the switch quantity acquisition circuit of variety classes switching signal, for the switching signal collecting being converted into analog to digital conversion circuit, CAN communicating circuit and the power-supplying circuit of digital signal, described switch quantity acquisition circuit is connected with analog to digital conversion circuit signal, analog-digital conversion circuit as described, CAN communicating circuit are all connected with single-chip microcomputer signal, and described power circuit is electrically connected to single-chip microcomputer.

Described switch quantity acquisition circuit comprises resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, described R1, R2, R3 one end is connected and is connected with switching signal input, the described R1 other end is connected with power end, the described R2 other end respectively with earth terminal, R4 one end, C1 one end and C2 one end connect, the described R3 other end respectively with the R4 other end, the C1 other end and R5 one end connect, described R4 one end also respectively with C1 one end, C2 one end connects, the described R4 other end also respectively with the C1 other end, R5 one end connects, Hai YuC2 one end, described C1 one end connects, the described C1 other end is also connected with R5 one end, the described C2 other end is also connected with the R5 other end, and the described C2 other end is also connected with signal output KG1 with the R5 other end.

Described R1=R2=100K Ω, R3=200K Ω, R4=20K Ω, R5=2K Ω, C1=C2=0.01 μ F.

The chip model that analog-digital conversion circuit as described adopts is AD7908, and described chip and single-chip microcomputer carry out the communication of SPI communication interface.

Adopt above structure compared with prior art, the utlity model has following advantage: by special switch Acquisition Circuit by different types of switching signal collection, then by analog to digital conversion circuit, the voltage signal collecting is converted to digital data transmission to single-chip microcomputer, then single-chip microcomputer judges the state of multiple vehicle switch by the digital signal receiving, this switch acquisition system can gather the switching signal without kind, and design is simple, can be general to dissimilar car, management difficulty is less and reliability is higher.

Accompanying drawing explanation

Fig. 1 is that the circuit of the utility model Universal automobile switch acquisition system connects block diagram.

Fig. 2 is the circuit theory diagrams of switch quantity acquisition circuit in the utility model Universal automobile switch acquisition system.

Fig. 3 is the circuit theory diagrams of analog to digital conversion circuit in the utility model Universal automobile switch acquisition system.

Fig. 4 is the circuit theory diagrams of CAN communicating circuit in the utility model Universal automobile switch acquisition system.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the utility model is described further, but the utility model is not limited only to following embodiment.

As shown in the figure: a kind of Universal automobile switch acquisition system, it is characterized in that: it comprises single-chip microcomputer, a plurality of for gathering the switch quantity acquisition circuit of variety classes switching signal, for the switching signal collecting being converted into analog to digital conversion circuit, CAN communicating circuit and the power-supplying circuit of digital signal, described switch quantity acquisition circuit is connected with analog to digital conversion circuit signal, analog-digital conversion circuit as described, CAN communicating circuit are all connected with single-chip microcomputer signal, and described power circuit is electrically connected to single-chip microcomputer.

Described switch quantity acquisition circuit bag resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, described R1, R2, R3 one end is connected and is connected with switching signal input, the described R1 other end is connected with power end, the described R2 other end respectively with earth terminal, R4 one end, C1 one end and C2 one end connect, the described R3 other end respectively with the R4 other end, the C1 other end and R5 one end connect, described R4 one end also respectively with C1 one end, C2 one end connects, the described R4 other end also respectively with the C1 other end, R5 one end connects, Hai YuC2 one end, described C1 one end connects, the described C1 other end is also connected with R5 one end, the described C2 other end is also connected with the R5 other end, and the described C2 other end is also connected with signal output KG1 with the R5 other end.

Described R1=R2=100K, R3=200K, R4=20K, R5=2K, C1=C2=0.01 μ F.

Be illustrated in figure 2 the circuit theory diagrams of switch quantity acquisition circuit, in this circuit, switching signal input is received on car on switch.At present switch is conventional switch ground connection, and switch connects height, and switch disconnects.This utility model can gather simultaneously and connect height (just controlling), and ground connection (negative control) is unsettled.

In switching signal input, access power supply, if supply voltage=24V by the voltage that circuit computing method can obtain signal output part is so:

Signal output=power supply * (R4)/(R3+R4)=24 * (20k)/(200k+20k)=2.18V;

Access ground in switching signal input, can obtain signal output voltage by circuit computing method so and be:

Signal output=ground * (R4)/(R3+R4)=0;

Unsettled in switching signal input, by circuit computing method, can obtain signal output voltage so and be:

Signal output=power supply * (R2//(R3+R4))/(R2//(R3+R4)+R1)=9.77V;

By above clearing, can obtain when switching value input end accesses different states, the voltage of signal output has significant variation, so can gather different types of switching signal by this switch quantity acquisition circuit.

As shown in Figure 3, described analog to digital conversion circuit can be changed 8 way switch amount Acquisition Circuit simultaneously, always has the same circuit in 4 tunnels in this specific embodiment, can gather 32 way switch amount states simultaneously.The AD7908 chip that analog to digital conversion circuit adopts AD company to produce, itself and single-chip microcomputer adopt the communication of SPI communication interface, and single-chip microcomputer sends to AD7908 by conversion command by SPI interface, and AD7908 sends to single-chip microcomputer by the data of having changed by SPI.

Wherein 5 pin of AD7908,6 pin meet power supply 5V, 4 pin, 8 pin, 17 pin, 20 pin ground connection, and 7 pin access benchmark comparative voltage 2.5V, 19 pin meet 3.3V; 3 pin are the chip select pin with microcontroller communication, select the reading and writing data of corresponding chip, the data input pin that 1 pin is AD7908, the data output pin that 2 pin are AD7908, the clock input pin that 18 pin are AD7908 with this pin.9,10,11,12,13,14,15,16 is the input pin of 8 way switch amount Acquisition Circuit.By this circuit, the voltage transitions obtaining in switch quantity acquisition circuit is become to the digital signal in single-chip microcomputer, by the judgement of digital signal, obtain the state of vehicle switch.

Be illustrated in figure 4 CAN communicating circuit, by this circuit, single-chip microcomputer reports car load CAN bus by the switching information collecting, and makes other equipment of car load can use the state of this switching value.

Claims

1. a Universal automobile switch acquisition system, it is characterized in that: it comprises single-chip microcomputer, a plurality of for gathering the switch quantity acquisition circuit of variety classes switching signal, for the switching signal collecting being converted into analog to digital conversion circuit, CAN communicating circuit and the power-supplying circuit of digital signal, described switch quantity acquisition circuit is connected with analog to digital conversion circuit signal, analog-digital conversion circuit as described, CAN communicating circuit are all connected with single-chip microcomputer signal, and described power circuit is electrically connected to single-chip microcomputer.

2. Universal automobile switch acquisition system according to claim 1, it is characterized in that: described switch quantity acquisition circuit comprises resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, described R1, R2, R3 one end is connected and is connected with switching signal input, the described R1 other end is connected with power end, the described R2 other end respectively with earth terminal, R4 one end, C1 one end and C2 one end connect, the described R3 other end respectively with the R4 other end, the C1 other end and R5 one end connect, described R4 one end also respectively with C1 one end, C2 one end connects, the described R4 other end also respectively with the C1 other end, R5 one end connects, Hai YuC2 one end, described C1 one end connects, the described C1 other end is also connected with R5 one end, the described C2 other end is also connected with the R5 other end, and the described C2 other end is also connected with signal output KG1 with the R5 other end.

3. Universal automobile switch acquisition system according to claim 2, is characterized in that: described R1=R2=100K Ω, R3=200K Ω, R4=20K Ω, R5=2K Ω, C1=C2=0.01 μ F.

4. Universal automobile switch acquisition system according to claim 1, is characterized in that: the chip model that analog-digital conversion circuit as described adopts is AD7908, and described chip and single-chip microcomputer carry out the communication of SPI communication interface.