CN210572360U - Wheel speed sensor signal generating device for automobile test - Google Patents
Wheel speed sensor signal generating device for automobile test Download PDFInfo
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- CN210572360U CN210572360U CN201920880414.6U CN201920880414U CN210572360U CN 210572360 U CN210572360 U CN 210572360U CN 201920880414 U CN201920880414 U CN 201920880414U CN 210572360 U CN210572360 U CN 210572360U
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Abstract
The utility model provides a fast sensor signal generator of wheel is used in automotive test, the simulation of the fast sensor signal generator of wheel is installed on the sensor signal on four wheels of car, include: the signal switching device is connected with the controller through the signal conversion device, the signal switching device controls the on-off of 12v power supply voltage of the signal conversion device through the on-off of 3.3v, and the current output is influenced through the on-off of 3.3v input voltage, so that the current is output as a square wave signal; the signal conversion device converts the voltage source signal into 7mA, 14mA and 28mA current signals required by the controller. The utility model can simulate the signal of the wheel speed sensor according to different requirements without actual operation, and is very simple and convenient; provides an economic and applicable prop for the research and development of the automobile test bench.
Description
Technical Field
The utility model relates to a new energy automobile rack test technical field specifically is a wheel speed sensor signal generating device is used in automotive test.
Background
ABS systems are an important component of automotive safety. Among them, the wheel speed sensor is a key component for the operation of the ABS system, and is responsible for providing the ABS system with status information of each wheel. Therefore, the wheel speed sensor signal is an indispensable input source for bench testing of the vehicle.
In a steering system test rig, because there is no information on the rotational speed of the wheels, an analog rotational speed signal is required. Currently, there are two ways that can be employed: 1: the real environment is built, the transmission system is used for driving the target wheel, so that the target wheel and the fixed wheel speed sensor rotate relatively, the rotating working condition of the wheel is simulated, and the wheel speed sensor generates a signal to be output. The environment of the scheme is extremely complicated to build, a transmission system, a fixing clamp, peripheral parts and the like are needed, the design of the whole scheme is long in time consumption, and hardware consumable materials are high in cost. 2: the wheel speed signal is output to the upper layer software in some form through simulation in the test software by the computer. The scheme is adopted, an upper computer is required, software of different control modules needs to customize the wheel speed signal simulation scheme again, and the universality is poor.
Disclosure of Invention
The utility model provides a technical problem provide a wheel speed sensor signal generating device is used in automotive test to solve the problem that proposes in the above-mentioned background art.
The utility model provides a technical problem adopt following technical scheme to realize: a wheel speed sensor signal generating device for automobile test, which simulates sensor signals installed on four wheels of an automobile, comprises: the signal switching device is connected with the controller through the signal conversion device, the signal switching device controls the on-off of 12v power supply voltage of the signal conversion device through the on-off of 3.3v, and the current output is influenced through the on-off of 3.3v input voltage, so that the current is output as a square wave signal; the signal conversion device converts the voltage source signals into 7mA, 14mA and 28mA current signals required by the controller.
The signal switch device is composed of two triodes and a resistance capacitor, 3.3v of control signals enter the base electrode of the triode No. 1, then the collector electrode of the triode No. 2 is connected with the base electrode of the triode No. 2, 12v of power signals are connected with the collector electrode of the triode No. 2, a switch circuit is formed, and the on-off of a 12v power supply is controlled by the on-off of a 3.3v power supply.
The signal conversion device comprises a 7mA current signal generation circuit, a 14mA current signal generation circuit and a 28mA current signal generation circuit, and LM334 chips are adopted as voltage current chips of the 7mA current signal generation circuit, the 14mA current signal generation circuit and the 28mA current signal generation circuit.
Install static rectifier circuit on the LM334 chip, static rectifier circuit includes the diode, and diode and LM334 chip series connection, LM334 chip outside parallel have the resistance, and LM334 chip, diode outside parallel have the resistance.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model can simulate the signal of the wheel speed sensor according to different requirements without actual operation, and is very simple and convenient; provides an economic and applicable prop for the research and development of the automobile test bench.
Drawings
Fig. 1 is a circuit diagram of the signal switch device of the present invention.
Fig. 2 is a circuit diagram of the 7mA current signal generating circuit of the present invention.
Fig. 3 is a circuit diagram of the 14mA current signal generating circuit of the present invention.
Fig. 4 is a circuit diagram of the 28mA current signal generating circuit of the present invention.
Fig. 5 is a waveform diagram of the wheel speed sensor with direction information according to the present invention.
Detailed Description
In order to make the technical means, the characteristics of creation, the objects achieved and the functions of the present invention easy to understand, the present invention will be further explained with reference to the detailed drawings, and in the description of the present invention, it should be noted that unless otherwise specified or limited, the terms "mounted", "connected" and "connected" should be interpreted broadly, for example, they may be fixed or detachable or they may be connected integrally, mechanically or electrically, directly or indirectly through an intermediate medium, or they may be connected inside two elements.
As shown in fig. 1 to 4, a wheel speed sensor signal generating device for automobile test, which simulates sensor signals installed on four wheels of an automobile, comprises: the signal switching device is connected with the controller through the signal conversion device, the signal switching device controls the on-off of 12v power supply voltage of the signal conversion device through the on-off of 3.3v, and the current output is influenced through the on-off of 3.3v input voltage, so that the current is output as a square wave signal; the signal conversion device converts the voltage source signals into 7mA, 14mA and 28mA current signals required by the controller.
The signal switch device is composed of two triodes and a resistance capacitor, 3.3v of control signals enter the base electrode of the triode No. 1, then the collector electrode of the triode No. 2 is connected with the base electrode of the triode No. 2, 12v of power signals are connected with the collector electrode of the triode No. 2, a switch circuit is formed, and the on-off of a 12v power supply is controlled by the on-off of a 3.3v power supply.
The signal conversion device comprises a 7mA current signal generation circuit, a 14mA current signal generation circuit and a 28mA current signal generation circuit, and LM334 chips are adopted as voltage current chips of the 7mA current signal generation circuit, the 14mA current signal generation circuit and the 28mA current signal generation circuit.
Install static rectifier circuit on the LM334 chip, static rectifier circuit includes the diode, and diode and LM334 chip series connection, LM334 chip outside parallel have the resistance, and LM334 chip, diode outside parallel have the resistance.
As shown in FIG. 5, IH, IM, and IL are 3 levels that characterize current, where IH is 28mA, representing tachopulse signal; IM is 14mA, representing data protocol; IL is 7mA, which is the base current level. Through calculation of the frequency of the IH, the rotating speed of the wheel can be calculated. Through data analysis of IM, important information such as forward rotation and reverse rotation can be obtained.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a wheel speed sensor signal generator for automotive test, wheel speed sensor signal generator simulation is installed on the sensor signal on four wheels of car, its characterized in that: the method comprises the following steps: the signal switching device is connected with the controller through the signal conversion device, the signal switching device controls the on-off of 12v power supply voltage of the signal conversion device through the on-off of 3.3v, and the current output is influenced through the on-off of 3.3v input voltage, so that the current is output as a square wave signal; the signal conversion device converts the voltage source signals into 7mA, 14mA and 28mA current signals required by the controller.
2. The wheel speed sensor signal generating device for vehicle testing of claim 1, wherein: the signal switch device is composed of two triodes and a resistance capacitor, 3.3v of control signals enter the base electrode of the triode No. 1, then the collector electrode of the triode No. 2 is connected with the base electrode of the triode No. 2, 12v of power signals are connected with the collector electrode of the triode No. 2, a switch circuit is formed, and the on-off of a 12v power supply is controlled by the on-off of a 3.3v power supply.
3. The wheel speed sensor signal generating device for vehicle testing of claim 1, wherein: the signal conversion device comprises a 7mA current signal generation circuit, a 14mA current signal generation circuit and a 28mA current signal generation circuit, and LM334 chips are adopted as voltage current chips of the 7mA current signal generation circuit, the 14mA current signal generation circuit and the 28mA current signal generation circuit.
4. The wheel speed sensor signal generating device for vehicle testing of claim 3, wherein: install static rectifier circuit on the LM334 chip, static rectifier circuit includes the diode, and diode and LM334 chip series connection, LM334 chip outside parallel have the resistance, and LM334 chip, diode outside parallel have the resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880414.6U CN210572360U (en) | 2019-06-12 | 2019-06-12 | Wheel speed sensor signal generating device for automobile test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880414.6U CN210572360U (en) | 2019-06-12 | 2019-06-12 | Wheel speed sensor signal generating device for automobile test |
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| CN210572360U true CN210572360U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920880414.6U Active CN210572360U (en) | 2019-06-12 | 2019-06-12 | Wheel speed sensor signal generating device for automobile test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147976A (en) * | 2020-08-12 | 2020-12-29 | 上汽通用五菱汽车股份有限公司 | Wheel speed simulation system and method |
| CN114441182A (en) * | 2020-11-02 | 2022-05-06 | 北京三快在线科技有限公司 | Wheel speed simulation detection circuit and wheel speed detection device |
-
2019
- 2019-06-12 CN CN201920880414.6U patent/CN210572360U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147976A (en) * | 2020-08-12 | 2020-12-29 | 上汽通用五菱汽车股份有限公司 | Wheel speed simulation system and method |
| CN114441182A (en) * | 2020-11-02 | 2022-05-06 | 北京三快在线科技有限公司 | Wheel speed simulation detection circuit and wheel speed detection device |
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