CN100579829C - Switch state reading machine based on vehicle local internet bus - Google Patents
Switch state reading machine based on vehicle local internet bus Download PDFInfo
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- CN100579829C CN100579829C CN200810116810A CN200810116810A CN100579829C CN 100579829 C CN100579829 C CN 100579829C CN 200810116810 A CN200810116810 A CN 200810116810A CN 200810116810 A CN200810116810 A CN 200810116810A CN 100579829 C CN100579829 C CN 100579829C
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Abstract
The invention relates to a switch state reader based on an automobile intranet bus, which belongs to an automobile electronic control technical field. The reader comprises a bonding switch detecting circuit used for detecting the state of the automobile bonding switch, a grounding switch detecting circuit used for detecting the state of the automobile grounding switch, a micro processing unit provided with a bus communication module which is used for reading the output signals of the switch detecting circuits and converting the read signals into message frame codes and signal levels and sending the converted signals to the interface of the bus, and an interface of the bus used for building up communication relationship between the micro processing unit provided with the bus communication module and the communication bus. The reader of the invention has the advantages of being suitable for ordinary switches of the automobile, switch sensors and switch indicators, realizing the real-time detection of the switch state and the signal output of the switch state, and providing a scheme easy to be realized for the intelligent design of automobile-bone electrical apparatuses.
Description
Technical field
The present invention relates to a kind of switch state reading machine, belong to the auto electronic control technology field based on vehicle local internet bus.
Background technology
In the orthodox car body electrical system, the automobile electrical load is connected with switch, or load is connected with the relay of switch institute control apparatus.By the make-break operation of shift knob, realize power electricity break-make control to load.
In the modern automobile body electrical system, bussing technique is employed more and more.Use the automobile of bussing technique, its electrical equipment and switch no longer are traditional series relationship, send by bus but switch state is a digital signal, and current consumer receives control signal and carries out its due mode of operation from bus.The application of bussing technique makes body harness greatly simplify, and has reduced the wire harness cost, for automobile is reserved greater room; Simultaneously, coordinate to substitute traditional connection in series-parallel by the control of ECU controller and realize the vehicle mounted electrical apparatus restriction relation, manage more convenient.Local internet (Local InterconnectNetwork is hereinafter to be referred as LIN) is a kind of with low cost, widely used automobile bus technology.
Summary of the invention
The objective of the invention is to propose a kind of switch state reading machine based on vehicle local internet bus, based on the LIN bussing technique to taking electricity, taking ground switch, Switch sensor and the Switch indicating device designs, detect the state of vehicle switch in real time, and with the total wire joint of vehicle body LIN, on off state is sent by the LIN bus.
The on off state reader based on vehicle local internet bus that the present invention proposes comprises:
Take the electric switch testing circuit, be used to detect the state that automobile is taken electric switch, and switch state signal is converted to the signal that can read of microprocessing unit of band bus communication module, by photoelectric isolated chip (U1), resistance (R1), resistance (R2) is formed, the high-end pin of control of photoelectric isolated chip (U1) by resistance (R1) with take the electric switch signal and be connected, the control low side pin of photoelectric isolated chip (U1) with take earth signal and be connected, the controlled low side pin of photoelectric isolated chip (U1) is connected with signal digitally, the controlled high-end pin of photoelectric isolated chip (U1) is connected with digital electric signal by resistance, and the signal output after will changing simultaneously is to microprocessing unit;
Take ground switch testing circuit, be used to detect the state that automobile is taken the ground switch, and switch state signal is converted to the signal that can read of microprocessing unit of band bus communication module, by photoelectric isolated chip (U2), resistance (R3), resistance (R4) is formed, the high-end pin of control of photoelectric isolated chip (U2) is electrically connected with power by resistance (R3), the control low side pin of photoelectric isolated chip (U2) with take ground on-off signal be connected, the controlled low side pin of photoelectric isolated chip (U2) is connected with signal digitally, the controlled high-end pin of photoelectric isolated chip (U2) is connected with digital electric signal by resistance, exports the microprocessing unit discernible signal to microprocessing unit simultaneously;
The microprocessing unit of band bus communication module, be used to read above-mentioned electric switch testing circuit output signal and the above-mentioned ground switch testing circuit output signal of taking taken, according to host-host protocol the signal that reads is carried out the message frame coding, and according to the vehicle local internet bus agreement level signal of message frame coding is changed, at last change over signal is sent to bus interface;
Bus interface is used to make the microprocessing unit of above-mentioned band bus communication module and communication bus to set up correspondence.
The switch state reading machine that the present invention proposes based on vehicle local internet bus, its characteristics and advantage are: be applicable to automobile regular tap, Switch sensor and Switch indicating device, realization is to the real-time detection of on off state, and is sent to communication bus by bus interface.Reader of the present invention is used for man-machine interactive operation, electrical equipment control and the failure warning system of automotive electrical system, the interface of total linearize makes a large amount of switch and Switch sensor on the automobile, indicating device can be advantageously connected to bus, provide corresponding electric appliance work needed control signal, make that automotive electrical system control is simple, wire harness optimization, space saves, for the intelligentized design of vehicle mounted electrical apparatus provides a kind of embodiment that is easy to realize.
Description of drawings
The circuit block diagram that Fig. 1 proposes for the present invention based on the switch state reading machine of vehicle local internet bus.
Fig. 2 is the schematic circuit diagram of taking the electric switch testing circuit in the reader of the present invention.
Fig. 3 is the schematic circuit diagram of taking ground switch testing circuit in the reader of the present invention.
The specific embodiment
The on off state reader that the present invention proposes based on vehicle local internet bus, its circuit block diagram comprises as shown in Figure 1:
Take the electric switch testing circuit, be used to detect the state that automobile is taken electric switch, and switch state signal is converted to the signal that can read of microprocessing unit of band bus communication module.The schematic circuit diagram of taking the electric switch testing circuit are made up of photoelectric isolated chip U1, resistance R 1, resistance R 2 as shown in Figure 2, the high-end pin of the control of photoelectric isolated chip U1 by resistance R 1 with take electric switch signal SHi and be connected; The control low side pin of photoelectric isolated chip U1 with take earth signal and be connected; The controlled low side pin of photoelectric isolated chip is connected with signal digitally; The controlled high-end pin of photoelectric isolated chip is connected with digital electric Vcc by resistance, and the microprocessing unit of pin output simultaneously discernible signal PHi is to microprocessing unit.
Take ground switch testing circuit, be used to detect the state that automobile is taken the ground switch, and convert switch state signal to signal that the microprocessing unit of band bus communication module can read.The schematic circuit diagram of taking ground switch testing circuit are made up of photoelectric isolated chip U2, resistance R 3, resistance R 4 as shown in Figure 3.Its annexation is: the high-end pin of the control of photoelectric isolated chip U2 is electrically connected with power by resistance R 3; The control low side pin of photoelectric isolated chip U2 with take ground on-off signal SLi and be connected; The controlled low side pin of photoelectric isolated chip is connected with signal digitally; The controlled high-end pin of photoelectric isolated chip is by resistance and digital electric signal Vcc.
The microprocessing unit of band bus communication module, be used to read above-mentioned electric switch testing circuit output signal and the above-mentioned ground switch testing circuit output signal of taking taken, according to host-host protocol the signal that reads is carried out the message frame coding, and according to the vehicle local internet bus agreement level signal of message frame coding is changed, at last change over signal is sent to bus interface.Microprocessing unit among the present invention adopts a kind of system of micro controller system and the bus signals transceiver module with the bus transmission-receiving function.
Bus interface is used to make the microprocessing unit of above-mentioned band bus communication module and communication bus to set up correspondence, is a kind of common interface that patches.
Reader of the present invention is applicable to that reading various automobiles takes electric switch, takes ground switch, regular tap and the sensor of on-off principle and the on off state of indicating device, as engine start switch, engine off switch, the cue button switch of getting off, BK Brake Switch, Parking switch biography, reversing switch, neutral position switch, reverse gear switch, water-level alarm switch, air pressure alarm switch, the indication of vehicle door status feedback, the indication of automobile current generator neutral etc.
In the reader of the present invention take the ground switch and take electric switch can respectively have a plurality of, for example can be m take the electric switch testing circuit with n take the switch testing circuit be connected with microprocessing unit respectively, m, n are natural number.
Wherein take electric switch, be exactly an end and power power-supply bonded assembly switch, when switch closure, the output switch state signal is a high level signal; When switch disconnected, output switching signal was unsettled signal; What is called is taken the ground switch, exactly an end with take earth signal bonded assembly switch.When switch closure, the output switch state signal is for taking earth signal; When switch disconnected, output switching signal was unsettled signal.
Wherein take the ground switch, exactly an end with take earth signal bonded assembly switch.When switch closure, the output switch state signal is for taking earth signal; When switch disconnected, output switching signal was unsettled signal.Take ground switches set output switch state signal SL1～SLn to control circuit.
In one embodiment of the present of invention, photoelectric isolated chip U1 selects TLP521 model chip for use, is produced by Toshiba; R1, R2 are conventional, electric-resistance.Photoelectric isolated chip U2 selects TLP521 model chip for use, is produced by Toshiba; R3, R4 are conventional, electric-resistance.It is the micro controller system of MC68HC908QL4 and the LIN transceiving chip that model is MC33399 that the microprocessing unit of band bus communication module is selected the model of band LIN function for use, produces by Freescale company.Bus interface is a common interface that patches, and is used for being connected with communication bus.
Claims (1)
1, a kind of on off state reader based on vehicle local internet bus is characterized in that this reader comprises:
Take the electric switch testing circuit, be used to detect the state that automobile is taken electric switch, and switch state signal is converted to the signal that can read of microprocessing unit of band bus communication module, take the electric switch testing circuit by first photoelectric isolated chip (U1), first resistance (R1), second resistance (R2) is formed, the high-end pin of control of first photoelectric isolated chip (U1) by first resistance (R1) with take the electric switch signal and be connected, the control low side pin of first photoelectric isolated chip (U1) with take earth signal and be connected, the controlled low side pin of first photoelectric isolated chip (U1) is connected with signal digitally, the controlled high-end pin of first photoelectric isolated chip (U1) is connected with digital electric signal by second resistance (R2), takes signal output after the electric switch testing circuit will be changed simultaneously to microprocessing unit;
Take ground switch testing circuit, be used to detect the state that automobile is taken the ground switch, and switch state signal is converted to the signal that can read of microprocessing unit of band bus communication module, take ground switch testing circuit by second photoelectric isolated chip (U2), the 3rd resistance (R3), the 4th resistance (R4) is formed, the high-end pin of control of second photoelectric isolated chip (U2) is electrically connected with power by the 3rd resistance (R3), the control low side pin of second photoelectric isolated chip (U2) with take ground on-off signal be connected, the controlled low side pin of second photoelectric isolated chip (U2) is connected with signal digitally, the controlled high-end pin of second photoelectric isolated chip (U2) is connected with digital electric signal by the 4th resistance (R4), takes signal output after ground switch testing circuit will be changed simultaneously to microprocessing unit;
The microprocessing unit of band bus communication module, be used to read above-mentioned electric switch testing circuit output signal and the above-mentioned ground switch testing circuit output signal of taking taken, according to host-host protocol the signal that reads is carried out the message frame coding, and according to the vehicle local internet bus agreement level signal of message frame coding is changed, at last change over signal is sent to bus interface;
Bus interface is used to make the microprocessing unit of above-mentioned band bus communication module and communication bus to set up correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810116810A CN100579829C (en) | 2008-07-18 | 2008-07-18 | Switch state reading machine based on vehicle local internet bus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810116810A CN100579829C (en) | 2008-07-18 | 2008-07-18 | Switch state reading machine based on vehicle local internet bus |
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| Publication Number | Publication Date |
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| CN101323281A CN101323281A (en) | 2008-12-17 |
| CN100579829C true CN100579829C (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810116810A Active CN100579829C (en) | 2008-07-18 | 2008-07-18 | Switch state reading machine based on vehicle local internet bus |
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| CN (1) | CN100579829C (en) |
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| CN101323281A (en) | 2008-12-17 |
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