CN113485155A - Universal wheel speed simulator and method - Google Patents
Universal wheel speed simulator and method Download PDFInfo
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- CN113485155A CN113485155A CN202110629286.XA CN202110629286A CN113485155A CN 113485155 A CN113485155 A CN 113485155A CN 202110629286 A CN202110629286 A CN 202110629286A CN 113485155 A CN113485155 A CN 113485155A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
Abstract
The invention discloses a universal wheel speed simulator and a method. The input interface receives the wheel speed input information and sends the wheel speed input information to the arithmetic unit; the operation unit receives the wheel speed input information to generate an analog wheel speed control pulse signal, and then sends the analog wheel speed control pulse signal to the signal conversion circuit; the signal conversion circuit receives the analog wheel speed control pulse signal, further outputs a wheel speed signal of a corresponding type and sends the wheel speed signal to the wheel speed interface; and the wheel speed interface receives the wheel speed signal and then outputs the wheel speed signal to equipment needing wheel speed. The invention realizes the simulation of universal wheel speed, and is used for the input of approximate actual wheel speed in the occasions of research and development test, offline detection, bench program verification and the like and other occasions needing wheel speed.
Description
Technical Field
The invention relates to a universal wheel speed simulator and a method thereof, in particular to a device and a method applied to occasions needing wheel speed, and perfects a method for generating a wheel speed signal of an automobile test bench.
Background
In the development, testing and offline detection processes, it is often necessary to simulate real wheel speed signals and input the signals into Brake systems such as abs (antilock Brake system), esp (electronic Stability program) and the like to detect the performance of the Brake systems. However, in development and testing, a mechanical wheel speed sensor is often used to provide a wheel speed signal in a manual rotation manner. The wheel speed is uncontrollable in the mode, and the wheel speed curve of the real vehicle cannot be well simulated. A V-F conversion module is often used on the rack and is matched with a voltage-current conversion module to realize the simulation of a wheel speed signal. However, this method requires two conversions, and may cause a delay or inconsistency in the converted wheel speed signal due to the signal transmission time during the conversion. The wheel speed signal output by the invention is collected from an actual vehicle, and is directly converted into a current square wave signal with the same frequency from a voltage square wave signal with a certain frequency without a plurality of conversion links. Therefore, the invention can well solve the problems in practice.
Disclosure of Invention
In order to solve the problems in the background art, the present invention provides a universal wheel speed simulator and a method thereof, which provide a more convenient test tool, reduce signal conversion steps, and provide a wheel speed curve closer to the wheel speed of an actual vehicle.
The technical scheme adopted by the invention is as follows:
a universal wheel speed simulator and a method are provided:
comprises an input interface, an arithmetic unit, a signal conversion circuit and a wheel speed interface; the input interface is connected with the input end of the operation unit, the output end of the operation unit is connected with the wheel speed interface through the signal conversion circuit, and the wheel speed interface is connected with the wheel speed input interface of the ECU;
the module replaces a wheel speed sensor on an original vehicle wheel fixing bracket, is not connected back to the wheel speed sensor on the wheel fixing bracket any more, but is connected to a wheel speed input interface of an ECU (electronic control system), wherein the ECU refers to a control unit such as an ABS (anti-lock braking system), an ESC (electronic stability program) (ESP) and the like which needs wheel speed.
The input interface receives wheel speed input information and sends the wheel speed input information to the arithmetic unit;
the operation unit receives wheel speed input information from the input interface to generate an analog wheel speed control pulse signal, and then sends the analog wheel speed control pulse signal to the signal conversion circuit;
the signal conversion circuit receives the analog wheel speed control pulse signal from the arithmetic unit, further outputs a wheel speed signal of a corresponding type and sends the wheel speed signal to the wheel speed interface;
the wheel speed interface receives a wheel speed signal from the signal conversion circuit and outputs the wheel speed signal to equipment needing wheel speed.
The display module is connected with the operation unit and displays the current working state information of the wheel speed simulator.
The power supply module is electrically connected with the storage device, the operation unit, the display module and the signal conversion circuit respectively.
The input interface comprises three parts including a storage device, a key input and a wheel speed message.
The signal conversion circuit comprises two types, namely a signal conversion circuit 1 type and a signal conversion circuit 2 type; the wheel speed interface comprises two types, namely a wheel speed interface signal type 1 and a wheel speed interface signal type 2; the signal conversion circuit 1 type and the signal conversion circuit 2 type are both electrically connected with the arithmetic unit, the wheel speed interface signal 1 type is electrically connected with the signal conversion circuit 1 type, and the wheel speed interface signal 2 type is electrically connected with the signal conversion circuit 2 type;
the signal conversion circuit 1 converts the analog wheel speed control pulse signal into a 7-14mA square wave current signal which is the same as that of the active wheel speed sensor, and the wheel speed interface signal 1 is a Hall wheel speed signal interface of the active wheel speed sensor type, receives the square wave current signal and then outputs the Hall wheel speed signal;
the signal conversion circuit 2 converts the analog wheel speed control pulse signal into a sine wave voltage signal with a corresponding frequency, and the wheel speed interface signal 2 is a passive wheel speed signal interface, namely a magnetoelectric wheel speed signal interface, and receives a square wave voltage signal to output a magnetoelectric wheel speed signal.
The square wave current signal of 7-14mA output by the signal conversion circuit 1 is floating, namely, the reference of the power supply voltage of the wheel speed simulator, the ground or any signal source taking the ground as a reference is not needed.
The processing method of the wheel speed computing unit mainly comprises the following steps:
1) inputting the wheel speed input information of each wheel into an arithmetic unit to obtain the frequency of a control signal;
in the step 1), the wheel length s corresponding to two tooth spaces is obtained by dividing the wheel perimeter c by the number of teeth of a gear ring of an actual vehicle wheel; and combining the input wheel speed input information v according to the wheel length s corresponding to two tooth spaces to obtain the time t of the wheel passing through the two tooth spaces as s/v, and then obtaining the frequency f of the control signal as 1/t according to the time t.
2) When the wheel speed changes, integral operation is carried out according to the wheel speed to obtain the running distance;
3) comparing the running distance with the length of the tire corresponding to the wheel gear ring of the real vehicle in real time to obtain a time point for changing the level of the control signal, setting the frequency of the control signal at the time point, and performing level conversion on the control signal;
the wheel speed is not constant or can be changed at will.
The operation unit periodically acquires currently input wheel speed input information, namely a set target wheel speed v from the wheel speed input interface, which means that the step 1) is performed at the moment, and calculates the frequency of the control signal, but the frequency of the control signal cannot be changed at once at the moment; the wheel speed change of the actual vehicle must pass through two teeth and is calculated; to be consistent with the actual situation, a change is made when the sensor reaches the next tooth; the integral of the speed over time is the length, and the frequency of the control signal can be reset when the length is equal to s; therefore, before (including) the timing at which the control signal frequency can be reset, if the wheel speed acquired from the wheel speed input interface, that is, the target wheel speed, is changed, the update of the control signal frequency is performed.
4) And generating a control signal according to the frequency of the control signal, sending the control signal to the signal conversion circuit, and converting the wheel speed control signal into an analog wheel speed signal.
The collected wheel speed signals are transmitted to the MCU through buses such as CAN, K-LINE and LIN or storage equipment matched with keys, a touch screen and the like to select wheel speed curves, the MCU obtains each wheel speed, the wheel speed curves are output to the signal conversion circuit through operation and transmitted to the ECU such as ABS (anti Brake System), ESP (electronic Stability program) and the like through a wheel speed interface, and the ECU realizes corresponding functions according to the simulated wheel speed. Therefore, the wheel speed input method achieves the purpose of wheel speed input for research and development testing, offline detection and bench program verification.
The invention has the beneficial effects that:
1. the wheel speed information is acquired by the real vehicle, the wheel speed signal of the real vehicle can be restored to the maximum extent, and great help is provided for research and development, test, program verification and other work;
2. wheel speed information under various road conditions (high attachment, low attachment, split opening and the like) collected from an actual vehicle is converted and provided for an ECU to carry out simulation test, so that the development period can be shortened, and the consumption of a large amount of manpower and material resources is saved;
3. the device can simulate various wheel speed sensors, an active non-intelligent Hall wheel speed sensor, an active intelligent Hall wheel speed sensor and a passive magnetoelectric wheel speed sensor, and has strong universality;
4. the 7-14mA square wave current signal output by the technical up-conversion circuit 1 type (51) is floating, i.e. it is not necessary to refer to the power voltage of the wheel speed simulator, the ground or any signal source taking the ground as a reference, so that the method can be applied to a wheel speed analysis chip for sampling the wheel speed at the power supply end and also applied to a wheel speed analysis chip for sampling the wheel speed at the ground end.
5. The technology lays a foundation for the realization of a wheel speed simulator of an active intelligent Hall sensor of 7-14-28 mA.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of the present invention.
Detailed Description
The embodiments of the present invention are further described below with reference to FIG. 1:
as shown in fig. 1, the simulator includes an input interface 2, an arithmetic unit 3, a signal conversion circuit 5 and a wheel speed interface 6; the input interface 2 is connected with the input end of the operation unit 3, the output end of the operation unit 3 is connected with the wheel speed interface 6 through the signal conversion circuit 5, and the wheel speed interface 6 is connected with four wheels.
The input interface 2 receives wheel speed input information and sends and provides the wheel speed input information to the arithmetic unit 3;
the operation unit 3 receives the wheel speed input information from the input interface 2 to generate an analog wheel speed control pulse signal, and then sends the analog wheel speed control pulse signal to the signal conversion circuit 5;
the arithmetic unit 3 provides the wheel speed information under the actual working condition which is acquired in advance for the simulator in a mode of reading a storage device or bus communication.
The signal conversion circuit 5 receives the analog wheel speed control pulse signal from the arithmetic unit 3, further outputs a wheel speed signal of a corresponding type, and sends the wheel speed signal to the wheel speed interface 6;
and a wheel speed interface 6 for receiving the wheel speed signal from the signal conversion circuit 5 and outputting the wheel speed signal to a device requiring wheel speed. For example, an ECU of an automobile, and the ECU performs a braking function.
The wheel speed simulator also comprises a display module 4, the operation unit 3 is connected with the display module 4, and the display module 4 receives data sent by the operation unit 3 and then displays the current working state information of the wheel speed simulator.
The display module 4 displays the wheel speed curve information to be selected, displays the current wheel speed item output progress, and displays the current wheel speed and other information.
The power supply system further comprises a power supply module 1, the power supply module 1 is used for supplying power to electrical appliances in the system, and the power supply module 1 is electrically connected with the storage device 21, the operation unit 3, the display module 4 and the signal conversion circuit 5 respectively.
The input interface 2 includes three parts, including a memory device 21, a key input 22 and a wheel speed message 23, wherein the memory device 21 is the wheel speed input information transmitted after being inserted into a memory such as an SD card or a usb disk, the key input 22 is the wheel speed input information transmitted after being manually input by a key, and the wheel speed message 23 is the wheel speed input information transmitted by vehicle communication.
The signal conversion circuit 5 includes two types, which are divided into a signal conversion circuit 1 type 51 and a signal conversion circuit 2 type 52; the wheel speed interface 6 comprises two types, namely a wheel speed interface signal 1 type 61 and a wheel speed interface signal 2 type 62; the signal conversion circuit 1 type 51 and the signal conversion circuit 2 type 52 are both electrically connected with the arithmetic unit 3, the wheel speed interface signal 1 type 61 is electrically connected with the signal conversion circuit 1 type 51, and the wheel speed interface signal 2 type 62 is electrically connected with the signal conversion circuit 2 type 52;
the signal conversion circuit 1 type 51 converts the analog wheel speed control pulse signal into a 7-14mA square wave current signal which is the same as that of the active wheel speed sensor, and a wheel speed interface signal 1 type 61 is an interface for replacing the active Hall wheel speed sensor, receives the square wave current signal and then outputs a wheel speed signal which is the same as that of the Hall wheel speed sensor;
the signal conversion circuit 2-type 52 converts the analog wheel speed control pulse signal into a sine wave voltage signal with a corresponding frequency, and the wheel speed interface signal 2-type 62 is a magnetoelectric wheel speed signal interface, receives the square wave voltage signal and outputs a wheel speed signal identical to that of the magnetoelectric wheel speed sensor.
The two signal conversion circuits respectively act, so that the universality of the system is improved; the wheel speed interface 6 is used to provide a wheel speed signal interface to devices requiring wheel speed, which are generally referred to as abs (antilock Brake system), esp (electronic Stability program), and the like.
In the invention, the wheel speed information provided and input is derived from real vehicle data; vehicle matching personnel acquire signals such as wheel speed and brake in the running process of the real vehicle through buses such as CAN, K and LIN and store the signals into a storage device; the access equipment is matched with the keys to select wheel speed data to be output or input the wheel speed data or a bus communication mode to the wheel speed simulator, and the wheel speed simulator is suitable for various types of wheel speed sensors through processing of different types of signal conversion circuits 5 and wheel speed interfaces 6.
The 7-14mA square wave current signal output by the signal conversion circuit 1 type 51 is floating, and is suitable for a circuit sampled at a power supply end and a circuit sampled at a ground end.
The signal conversion circuit 1 is formed by superposing two 7mA constant current source circuits and controlling the on-off of one of the two circuits to realize the 7-14mA current signal conversion.
The invention can realize high reduction of real vehicle signals, and the method mainly comprises the following two steps:
1) inputting the wheel speed input information of each wheel into the arithmetic unit 3 to obtain the frequency of the control signal;
specifically, the wheel length s corresponding to two tooth spaces is obtained by dividing the wheel perimeter c by the number of teeth of a gear ring of the wheel of the real vehicle; and combining the input wheel speed input information v according to the wheel length s corresponding to two tooth spaces to obtain the time t of the wheel passing through the two tooth spaces as s/v, and then obtaining the frequency f of the control signal as 1/t according to the time t.
2) When the wheel speed changes, integral operation is carried out according to the wheel speed to obtain the running distance;
3) comparing the running distance with the length of the tire corresponding to the wheel gear ring of the real vehicle in real time to obtain a time point for changing the level of the control signal, setting the frequency of the control signal at the time point, and performing level conversion on the control signal;
the wheel speed is not constant or can be changed at will.
The arithmetic unit 3 periodically acquires currently input wheel speed input information, namely a set target wheel speed v, from the wheel speed input interface, which means that the step 1) is performed at the moment, and calculates the frequency of the control signal, but the frequency of the control signal cannot be changed at once at the moment; the wheel speed change of the actual vehicle must pass through two teeth and is calculated; to be consistent with the actual situation, a change is made when the sensor reaches the next tooth; the integral of the speed over time is the length, and the frequency of the control signal can be reset when the length is equal to s; therefore, before (including) the timing at which the control signal frequency can be reset, if the wheel speed acquired from the wheel speed input interface, that is, the target wheel speed, is changed, the update of the control signal frequency is performed.
4) And generating a control signal according to the frequency of the control signal, sending the control signal to the signal conversion circuit, and converting the wheel speed control signal into an analog wheel speed signal.
In specific implementation, the MCU needs to provide a control signal to the signal conversion circuit by analyzing wheel speed information provided by a communication bus such as CAN or a storage device.
Therefore, the invention can realize the universal wheel speed simulation, and can highly restore the real vehicle signal by reproducing the wheel speed through the message.
Claims (7)
1. A universal wheel speed simulator and method is characterized in that:
comprises an input interface (2), an arithmetic unit (3), a signal conversion circuit (5) and a wheel speed interface (6); the input interface (2) is connected with the input end of the operation unit (3), the output end of the operation unit (3) is connected with the wheel speed interface (6) through the signal conversion circuit (5), and the wheel speed interface (6) is connected with the wheel speed input interface of the ECU;
the input interface (2) receives the wheel speed input information and sends and provides the wheel speed input information to the arithmetic unit (3);
the operation unit (3) receives the wheel speed input information from the input interface (2) to generate an analog wheel speed control pulse signal, and then sends the analog wheel speed control pulse signal to the signal conversion circuit (5);
the signal conversion circuit (5) receives the analog wheel speed control pulse signal from the arithmetic unit (3) so as to output a wheel speed signal of a corresponding type, and sends the wheel speed signal to the wheel speed interface (6);
the wheel speed interface (6) receives the wheel speed signal from the signal conversion circuit (5) and then outputs the wheel speed signal to equipment needing wheel speed.
2. The universal wheel speed simulator of claim 1,
the wheel speed simulator further comprises a display module (4), the operation unit (3) is connected with the display module (4), and the display module (4) displays the current working state information of the wheel speed simulator.
3. The universal wheel speed simulator of claim 1,
the intelligent display device is characterized by further comprising a power supply module (1), wherein the power supply module (1) is electrically connected with the storage device (21), the operation unit (3), the display module (4) and the signal conversion circuit (5) respectively.
4. The universal wheel speed simulator of claim 1,
the input interface (2) comprises three parts including a memory device (21), a key input (22) and a wheel speed message (23).
5. The universal wheel speed simulator of claim 1,
the signal conversion circuit (5) comprises two types, namely a signal conversion circuit 1 type (51) and a signal conversion circuit 2 type (52); the wheel speed interface (6) comprises two types, namely a wheel speed interface signal 1 type (61) and a wheel speed interface signal 2 type (62); the signal conversion circuit 1 type (51) and the signal conversion circuit 2 type (52) are electrically connected with the arithmetic unit (3), the wheel speed interface signal 1 type (61) is electrically connected with the signal conversion circuit 1 type (51), and the wheel speed interface signal 2 type (62) is electrically connected with the signal conversion circuit 2 type (52);
the signal conversion circuit 1 type (51) converts the analog wheel speed control pulse signal into a 7-14mA square wave current signal which is the same as that of the active wheel speed sensor, the wheel speed interface signal 1 type (61) is a Hall wheel speed signal interface of the active wheel speed sensor type, and receives the square wave current signal to further output the Hall wheel speed signal;
the signal conversion circuit 2 type (52) converts the analog wheel speed control pulse signal into a sine wave voltage signal with corresponding frequency, and the wheel speed interface signal 2 type (62) is a passive wheel speed signal interface, namely a magnetoelectric wheel speed signal interface, receives the square wave voltage signal and then outputs a magnetoelectric wheel speed signal.
6. The universal wheel speed simulator of claim 5,
the square wave current signal of 7-14mA output by the signal conversion circuit 1 type (51) is floating.
7. The processing method applied to the wheel speed operation unit of the universal wheel speed simulator of any one of claims 1 to 5 is characterized in that the method mainly comprises the following steps:
1) inputting the wheel speed input information of each wheel into an arithmetic unit (3) to obtain the frequency of a control signal;
2) when the wheel speed changes, integral operation is carried out according to the wheel speed to obtain the running distance;
3) comparing the running distance with the length of the tire corresponding to the wheel gear ring in real time to obtain a time point for changing the level of the control signal, setting the frequency of the control signal at the time point, and performing level conversion on the control signal;
4) and generating a control signal according to the frequency of the control signal, sending the control signal to the signal conversion circuit, and converting the wheel speed control signal into an analog wheel speed signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110629286.XA CN113485155B (en) | 2021-06-04 | Universal wheel speed simulator and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110629286.XA CN113485155B (en) | 2021-06-04 | Universal wheel speed simulator and method |
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| Publication Number | Publication Date |
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| CN113485155A true CN113485155A (en) | 2021-10-08 |
| CN113485155B CN113485155B (en) | 2024-05-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980050382A (en) * | 1996-12-20 | 1998-09-15 | 이형도 | Wheel speed simulator |
| CN1912565A (en) * | 2005-07-13 | 2007-02-14 | 广东工业大学 | Vehicle anti-block brake system and detection device and method for performance of its controller |
| CN104360604A (en) * | 2014-11-19 | 2015-02-18 | 清华大学 | Wheel speed simulating method and system used in automobile dynamics control simulation system |
| CN104880321A (en) * | 2015-05-18 | 2015-09-02 | 京西重工（上海）有限公司 | Environment simulator used for testing anti-lock brake system |
| CN207232757U (en) * | 2017-09-25 | 2018-04-13 | 北京经纬恒润科技有限公司 | A kind of wheel speed sensors simulation card |
| CN108871807A (en) * | 2018-09-21 | 2018-11-23 | 南京众控电子科技有限公司 | A kind of automobile ABS simulated testing system |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980050382A (en) * | 1996-12-20 | 1998-09-15 | 이형도 | Wheel speed simulator |
| CN1912565A (en) * | 2005-07-13 | 2007-02-14 | 广东工业大学 | Vehicle anti-block brake system and detection device and method for performance of its controller |
| CN104360604A (en) * | 2014-11-19 | 2015-02-18 | 清华大学 | Wheel speed simulating method and system used in automobile dynamics control simulation system |
| CN104880321A (en) * | 2015-05-18 | 2015-09-02 | 京西重工（上海）有限公司 | Environment simulator used for testing anti-lock brake system |
| CN207232757U (en) * | 2017-09-25 | 2018-04-13 | 北京经纬恒润科技有限公司 | A kind of wheel speed sensors simulation card |
| CN108871807A (en) * | 2018-09-21 | 2018-11-23 | 南京众控电子科技有限公司 | A kind of automobile ABS simulated testing system |
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