CN101324634B - Vehicle speed sensor with bus interface for vehicle - Google Patents
Vehicle speed sensor with bus interface for vehicle Download PDFInfo
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- CN101324634B CN101324634B CN2008101171755A CN200810117175A CN101324634B CN 101324634 B CN101324634 B CN 101324634B CN 2008101171755 A CN2008101171755 A CN 2008101171755A CN 200810117175 A CN200810117175 A CN 200810117175A CN 101324634 B CN101324634 B CN 101324634B
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- 238000004891 communication Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000002463 transducing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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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
The present invention relates to a kind of vehicle speed sensor that has bus interface that is used for automobile, belong to the auto electronic control technology field.
Background technology
In the orthodox car body electrical system, the sensor output signal of automobile directly is connected with signal receiver, when same transducing signal will send to a plurality of receiver, need draw multiple conducting wires is connected with these receivers respectively, it is complicated that this connected mode causes the car inside conductor to connect, and big, wire harness cost height take up room.
In the Hyundai Motor body electrical system, bussing technique is employed more and more.Use the automobile of bussing technique, its signal of sensor no longer directly is connected with receiver, but transducing signal is converted to digital signal and sends to communication bus by controller, and receiver is monitored required transducing signal from communication bus.The application of bussing technique makes a transducing signal to be received by a plurality of controllers on the bus easily and to use, and body harness is greatly simplified, and has reduced the wire harness cost, for automobile is reserved greater room.Controller local internet (Controller Area Network, hereinafter to be referred as CAN) and vehicle local internet (Local Interconnect Network is hereinafter to be referred as LIN) be wherein two kinds cheap, reliability is high, widely used automobile bus technology.
Summary of the invention
The objective of the invention is to propose a kind of vehicle speed sensor that has bus interface that is used for automobile, based on the automobile bus technology Hall-type vehicle speed sensor of sending square-wave signal on the automobile is designed, detect vehicle speed signal in real time, the result is converted to digital signal, and be connected with Vehicle Body Bus, result after the conversion is sent to communication bus,, saves interior space and manufacturing cost to simplify wire harness annexation in the car.
The vehicle speed sensor that has bus interface that is used for automobile that the present invention proposes comprises:
Sensor, being used for tested speed of a motor vehicle conversion of signals is square wave voltage signal U
iAfter, export amplitude limit square wave generative circuit to;
Amplitude limit square wave generative circuit is used for the square wave voltage signal U that receiving sensor is exported
i, with the square wave voltage signal U that receives
iConverting amplitude to is the square-wave signal U of 0～5V
o, and exporting the microprocessing unit of being with bus communication module to, amplitude limit square wave generative circuit is by a photoelectric isolated chip (T) and two resistance (R
1And R
2) form, the high-end pin of control of photoelectric isolated chip (T) is by resistance (R
1) with the square wave voltage signal U that receives
iBe connected, the control low side pin of photoelectric isolated chip (T) is connected with earth signal, and the controlled high-end pin of photoelectric isolated chip (T) is connected with digital electric signal Vcc, and the controlled low side pin of photoelectric isolated chip T is by resistance (R
8) be connected the controlled low side pin output square wave voltage signal U of photoelectric isolated chip (T) with signal digitally
oTo microprocessing unit with bus communication module;
The microprocessing unit of band bus communication module is used for the square wave voltage signal U to receiving
oCarry out the unit interval counting, and count results is converted to the numerical value of corresponding tested vehicle speed signal, according to host-host protocol the numerical value of tested vehicle speed signal is carried out the message frame coding then, according to the automobile bus agreement level signal of message frame coding is changed, switching signal is sent to bus interface.
The vehicle speed sensor that has bus interface that is used for automobile that the present invention proposes, can be used in the electrical apparatus control system of automotive electrical system, the interface of total linearize makes the magneto-electric vehicle speed sensor of sending square wave voltage signal on the automobile be advantageously connected to bus, provide relevant device and electrical work needed transducing 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.Sensor of the present invention can be made into vehicle speed sensor, can detect the speed of a motor vehicle in real time, the result is converted to digital signal, and is sent to communication bus by bus interface.
Description of drawings
Fig. 1 is the circuit block diagram of the vehicle speed sensor that has bus interface that is used for automobile of the present invention's proposition.
Fig. 2 is the circuit theory diagrams of the amplitude limit circuit and square-wave in the sensor of the present invention.
Embodiment
The vehicle speed sensor that has bus interface that is used for automobile that the present invention proposes, its circuit block diagram comprises as shown in Figure 1:
Sensor, being used for tested speed of a motor vehicle conversion of signals is square wave voltage signal U
i, and export amplitude limit square wave generative circuit to.Sensor is a Hall-type vehicle speed sensor, a termination 12V power supply of sensor, and the other end links to each other with earth signal, and the 3rd end links to each other with amplitude limit square wave generative circuit, during work, 8～12V square-wave signal that the sensor output frequency is variable.
Amplitude limit square wave generative circuit is used for the square wave voltage signal U that receiving sensor is exported
i, and the square wave voltage signal U to receiving
iConvert the square wave voltage signal U that amplitude is 0～5V to
oWith square wave voltage signal U
oExport the microprocessing unit of band bus communication module to, amplitude limit square wave generative circuit is by a photoelectric isolated chip (T) and two resistance (R
1), (R
2) form, the high-end pin of control of photoelectric isolated chip (T) is by resistance (R
1) with the square wave voltage signal U that receives
iBe connected, the control low side pin of photoelectric isolated chip (T) is connected with earth signal, and the controlled high-end pin of photoelectric isolated chip (T) is connected with digital electric signal Vcc, and the controlled low side pin of photoelectric isolated chip T is by resistance (R
8) be connected the controlled low side pin output square wave voltage signal U of photoelectric isolated chip (T) with signal digitally
oTo microprocessing unit with bus communication module;
The microprocessing unit of band bus communication module is used for the square wave voltage signal U to receiving
oCarrying out the unit interval counting handles, and count results is converted to the numerical value of corresponding tested physical signalling, according to host-host protocol the signal that reads is carried out the message frame coding then, the level signal of message frame coding is changed, switching signal is sent to bus interface according to the automobile bus agreement.
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.
The vehicle speed sensor that has bus interface that is used for automobile of the present invention is used to use the automobile of bussing technique, is particularly useful for using the automobile of CAN bus, LIN bussing technique, can be made into vehicle speed sensor.
In one embodiment of the present of invention, vehicle speed sensor is selected the Hall-type car speed sensor for use, and its model is that photoelectric isolated chip selects for use TLP521 model chip to realize its function, is produced by Toshiba Corp; Resistance R
1, R
2, be conventional, electric-resistance; It is the single-chip microcomputer 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. vehicle speed sensor that has bus interface that is used for automobile, it is characterized in that this vehicle speed sensor comprises: sensing device, being used for tested speed of a motor vehicle conversion of signals is square wave voltage signal U
iAfter, export amplitude limit square wave generative circuit to;
Amplitude limit square wave generative circuit is used to receive the square wave voltage signal U that sensing device is exported
i, with the square wave voltage signal U that receives
iConvert the square wave voltage signal U that amplitude is 0～5V to
o, and exporting the microprocessing unit of being with bus communication module to, amplitude limit square wave generative circuit is by a photoelectric isolated chip (T) and two resistance (R
1And R
2) form, the high-end pin of control of photoelectric isolated chip (T) is by the first resistance (R
1) with the square wave voltage signal U that receives
iBe connected, the control low side pin of photoelectric isolated chip (T) is connected with earth signal, and the controlled high-end pin of photoelectric isolated chip (T) is connected with digital electric signal Vcc, and the controlled low side pin of photoelectric isolated chip (T) is by the second resistance (R
2) be connected the controlled low side pin output square wave voltage signal U of photoelectric isolated chip (T) with signal digitally
oTo microprocessing unit with bus communication module;
The microprocessing unit of band bus communication module is used for the square wave voltage signal U to receiving
oCarry out the unit interval counting, and count results is converted to the numerical value of corresponding tested vehicle speed signal, according to host-host protocol the numerical value of tested vehicle speed signal is carried out the message frame coding, the level signal of message frame coding is changed, switching signal is sent to bus interface according to the automobile bus agreement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101171755A CN101324634B (en) | 2008-07-25 | 2008-07-25 | Vehicle speed sensor with bus interface for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101171755A CN101324634B (en) | 2008-07-25 | 2008-07-25 | Vehicle speed sensor with bus interface for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101324634A CN101324634A (en) | 2008-12-17 |
| CN101324634B true CN101324634B (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101171755A Expired - Fee Related CN101324634B (en) | 2008-07-25 | 2008-07-25 | Vehicle speed sensor with bus interface for vehicle |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796107B (en) * | 2015-05-06 | 2017-10-27 | 航天科技控股集团股份有限公司 | Automobile square-wave signal gathers adaptation method and collection adapter |
| CN108267155A (en) * | 2016-12-30 | 2018-07-10 | 惠州市德赛西威汽车电子股份有限公司 | A kind of car speed conversion method and its tool |
| CN111579809B (en) * | 2020-04-26 | 2022-01-21 | 淮安中科晶上智能网联研究院有限公司 | Motor rotating speed indicating system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780247A (en) * | 2004-11-26 | 2006-05-31 | 浙江中科正方电子技术有限公司 | Vehicle body CAN bus controlling system |
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2008
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780247A (en) * | 2004-11-26 | 2006-05-31 | 浙江中科正方电子技术有限公司 | Vehicle body CAN bus controlling system |
Non-Patent Citations (4)
| Title |
|---|
| 吴亚玲，霍亮生.CAN总线技术在汽车车速表和里程表中的应用.新技术新工艺 8.2005,(8),16-18. |
| 吴亚玲,霍亮生.CAN总线技术在汽车车速表和里程表中的应用.新技术新工艺 8.2005,(8),16-18. * |
| 陆文昌.基于CAN总线的汽车轮速传感器设计.传感器技术23 2.2004,23(2),34-37. |
| 陆文昌.基于CAN总线的汽车轮速传感器设计.传感器技术23 2.2004,23(2),34-37. * |
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| CN101324634A (en) | 2008-12-17 |
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Granted publication date: 20100602 |