A vehicle engine speed control training device and control method

Abstract

The present invention belongs to the technical field of automobile professional teaching, and discloses a practical training device and control method for automobile engine speed control. The device includes an accelerator pedal, a depth adjustment rod for adjusting the depth of the accelerator pedal, an electronic throttle body, an accelerator pedal position sensor fault setting module, an accelerator pedal position sensor power supply module, a sensor angle measurement module, a throttle body fault setting module, a throttle power supply and drive module, a display and button module, and a main controller. The control method includes accelerator pedal control, throttle body control, and engine throttle control. The present invention overcomes the defect that the existing automobile engine electronic control system is inconvenient to teach in kind. Through reasonable device structure and circuit principle design, it not only retains the teaching of the real object, but also has strong operability and good visual performance. It can carry out multiple practical training experiments at the same time and has the characteristics of low cost.

Description

Technical Field

[0001] The present invention belongs to the field of automobile professional teaching technology, and particularly relates to an automobile engine speed control training device and control method. Background Art

[0002] The automobile engine is the power source of the entire vehicle. The engine electronic control system is a closed-loop control system that accurately controls the engine's output power according to the driver's intention. The engine's output power depends on the engine speed, which is mainly controlled by the accelerator pedal under the control of the driver. The typical automobile engine throttle control system structure is as follows: Figure 1 As shown. The accelerator pedal is equipped with an accelerator pedal position sensor, which converts the driver's speed control intention into an electrical signal and sends it to the engine electronic control system. The electronic control system controls the throttle opening angle in the throttle body, thereby controlling the amount of air entering the engine. The electronic control system controls the injection amount according to the optimal air-fuel ratio control strategy to achieve the purpose of controlling the engine speed.

[0003] At present, when teaching the control strategy of automobile engine throttle control system, accelerator pedal position sensor, and throttle position sensor, the automobile-related majors in various colleges and universities all explain the theory in an abstract way, or directly bring the physical objects of the relevant sensors to the classroom or laboratory and use tools such as multimeters to measure and experiment on the sensors. This teaching equipment or method has the following main defects:

[0004] (1) Although the principles and strategies of throttle control can be explained clearly through block diagrams and animations, students do not have a sensory understanding of the control process of the entire control system. They cannot observe the impact of sensor parameters on the control system by changing the corresponding sensor output parameters, and explore the relationship between sensor parameters and control system output.

[0005] (2) When teaching sensor and control system fault diagnosis, the usual practice is to artificially damage the sensors of the functional vehicle to simulate open circuit, short circuit, poor contact and other fault phenomena. This method will increase the teaching cost accordingly. In addition, due to the influence of the components themselves, it is impossible to simulate the fault of the automotive electronic control module.

[0006] (3) When measuring the signals of sensors, actuators and other components during fault diagnosis, some connectors and wires are often broken in order to measure the corresponding signals, as no exposed measurement positions are reserved for safety reasons when the car is designed. This can lead to wire breakage and vehicle failure after a long period of time.

[0007] (4) When there are multiple types of faults in the circuit that need to be simulated, multiple sensors must be prepared; after the cause of the fault is found, the faulty component must be replaced to confirm the cause of the fault. During the repeated disassembly and installation of the components, poor contact of the components will occur, which greatly shortens the service life of the experimental equipment and indirectly increases the teaching cost.

[0008] (5) When conducting an accelerator pedal experiment, the experimenter needs to control the pedaling depth of the accelerator pedal while measuring and observing the sensor-related signals. The shift in attention will cause the pedaling force of the accelerator pedal to fluctuate. In addition, the pedaling depth controlled by humans cannot guarantee that the pedaling process will not fluctuate, thereby causing the output signal of the sensor to fluctuate, resulting in inaccurate experimental results. Summary of the invention

[0009] In order to solve the above problems, the present invention provides a vehicle engine speed control training device, which can simultaneously realize the teaching of the accelerator pedal, the electronic throttle body and the vehicle throttle control system, has the characteristics of good visual performance, convenient operation, clearer teaching principles, and reduces the experimental cost. The specific technical scheme is as follows:

[0010] A vehicle engine speed control training device, the device comprises an accelerator pedal, a depth adjustment rod for adjusting the depth of the accelerator pedal, an electronic throttle body, an accelerator pedal position sensor fault setting module, an accelerator pedal position sensor power supply module, a sensor angle measurement module, a throttle body fault setting module, a throttle power supply and drive module, a display and button module, and a main controller; an accelerator pedal position sensor is provided at the accelerator pedal, and the accelerator pedal position sensor is connected to the main controller through the accelerator pedal position sensor fault setting module; the sensor angle measurement module respectively measures the rotation shaft angle of the accelerator pedal and the rotation shaft angle of the electronic throttle body and transmits them to the main controller; the electronic throttle body is connected to the main controller through the throttle body fault setting module; the accelerator pedal position sensor power supply module is connected to the accelerator pedal position sensor fault setting module; the throttle power supply and drive module is respectively connected to the throttle body fault setting module and the main controller; the main controller is connected to the display and button module.

[0011] In this solution, the accelerator pedal depth is adjusted by the depth adjustment rod, the accelerator pedal position sensor detects the accelerator pedal position, and transmits its information to the main controller through the accelerator pedal position sensor fault setting module; the accelerator pedal position sensor fault setting module performs fault setting and simulation of the accelerator pedal position sensor, and outputs the signal of the accelerator pedal position sensor to the analog-to-digital conversion circuit of the main controller after passing through the internal circuit; the fault input is performed through the display and button module, and the main controller performs accelerator pedal position sensor fault setting through the accelerator pedal position sensor fault setting module according to the input, and / or performs throttle body fault setting through the throttle body fault setting module. Under the control of the main controller, the throttle body power supply and drive module drives the stepper motor in the electronic throttle body to control the opening of the throttle body, and displays it through the display and button module.

[0012] Another object of the present invention is to provide a control method for a vehicle engine speed control training device, the control method comprising: S1. performing accelerator pedal control; S2. performing electronic throttle control; S3. performing engine throttle control.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The key sensors, actuators, and controllers in the throttle control system of the automobile engine are presented in the form of physical objects on the experimental device, which can help students quickly understand and master relevant knowledge and skills when teaching related content; at the same time, the control parameters of the control system can be easily changed and set, and the execution results of the system after the parameters are changed can be intuitively observed, which can help students quickly understand and master the relationship between sensor parameters and control system output.

[0015] 2. When teaching content related to sensor and control system fault diagnosis, common open circuit and short circuit faults can be simulated by operating the control buttons of the experimental device without damaging the sensor or actuator. After students diagnose the fault of the corresponding component, they only need to restore the fault in the experimental device. During the entire teaching process, only one related sensor or actuator needs to be equipped to complete the setting and simulation of multiple faults, which can effectively increase the service life of teaching equipment and reduce teaching costs.

[0016] 3. A sensor signal interface module is set up on the experimental device, and relevant measurement points are designed. Students can use multimeters and other measuring tools to conveniently measure relevant signals without damaging the sensors and actuators, which has no impact on the equipment. In addition to helping students quickly diagnose and eliminate related faults, it can also effectively solve the problem of low service life of teaching equipment in existing teaching methods, indirectly reducing teaching costs.

[0017] 4. The present invention designs a control method based on the automobile engine speed control training device, which can carry out various control experiments and has rigorous logic.

[0018] The present invention overcomes the defect that the real object is inconvenient to teach in the prior art of automobile engine speed control. Through reasonable device structure and circuit principle design, it not only retains the real object teaching, but also is easy to operate, the experimental principle is intuitive, and multiple training experiments can be carried out at the same time, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0020] Figure 1 It is a control structure diagram of a throttle control system of an automobile engine in the prior art.

[0021] Figure 2 This is a schematic diagram of the structure of the automobile engine speed control training device of Example 1.

[0022] Figure 3 This is a schematic diagram of the plan layout of the automobile engine speed control training device in Example 1.

[0023] Figure 4 This is a circuit schematic diagram of the accelerator pedal position sensor power supply module in Example 1.

[0024] Figure 5 This is the circuit schematic diagram of the accelerator pedal position sensor fault setting module in Example 1.

[0025] Figure 6 This is the circuit schematic diagram of the throttle power supply and drive module of Example 1.

[0026] Figure 7 This is the circuit schematic diagram of the throttle body fault setting module in Example 1.

[0027] Figure 8 This is the circuit schematic diagram of the sensor angle measurement module of Example 1.

[0028] Fig. 9 This is the circuit schematic diagram of the sensor signal measurement interface module of Example 1.

[0029] Fig.10 This is the circuit schematic diagram of the display and key module of Example 1.

[0030] Fig.11This is the schematic diagram of the main controller circuit of Example 1.

[0031] Fig.12 This is the circuit schematic diagram of the power module of Example 1.

[0032] Fig.13 This is a schematic diagram of the depth adjustment rod structure of Example 1.

[0033] Fig.14 This is the flow chart of the accelerator pedal control experiment in Example 2.

[0034] Fig.15 This is the experimental flow chart of the electronic throttle body control in Example 2.

[0035] Fig.16 This is the flow chart of the engine throttle control experiment of Example 2. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 2 As shown, this embodiment provides a vehicle engine speed control training device, including an accelerator pedal, a depth adjustment lever, an electronic throttle body, an accelerator pedal position sensor fault setting module, an accelerator pedal position sensor power supply module, a sensor angle measurement module, a sensor signal measurement interface module, a throttle body fault setting module, a throttle power supply and drive module, a display and button module, and a main controller.

[0039] A throttle pedal position sensor is provided at the throttle pedal, and the throttle pedal position sensor is connected to the main controller through the throttle pedal position sensor fault setting module; the sensor angle measurement module respectively measures the rotation shaft angle of the throttle pedal and the rotation shaft angle of the electronic throttle body and transmits them to the main controller; the electronic throttle body is connected to the main controller through the throttle body fault setting module; the throttle pedal position sensor power supply module is connected to the throttle pedal position sensor fault setting module; the throttle power supply and drive module are respectively connected to the throttle body fault setting module and the main controller; the main controller is connected to the display and button module.

[0040] As a preferred implementation, the accelerator pedal position sensor power supply module is composed of a precision voltage regulator, a power adjustment tube, a bias resistor, an upper voltage divider resistor, a lower voltage divider resistor, and a filter capacitor to form a DC 5V constant voltage regulator; the common point of the upper voltage divider resistor and the filter capacitor is connected to the accelerator pedal position sensor fault setting module. Figure 4 As shown, the accelerator pedal position sensor power supply module is provided with two points, namely, the common point APP5V1 of the upper voltage-dividing resistor R3 and the filter capacitor C7, and the common point APP5V2 of the upper voltage-dividing resistor R6 and the filter capacitor C8, and the two common points are respectively connected to the accelerator pedal position sensor fault setting module. The accelerator pedal position sensor power supply module is connected to the accelerator pedal position sensor through the accelerator pedal position sensor fault setting module, providing a reference power supply for the two accelerator pedal position sensors, and at the same time enabling the accelerator pedal position sensor fault setting module to realize power supply fault setting.

[0041] like Figure 5 As shown, the accelerator pedal position sensor fault setting module is composed of a fault simulation relay, pull-down resistors R8 and R9, a Darlington tube driver U5, a control signal latch U6, a control signal serial-to-parallel converter U7, and an accelerator pedal wiring port P3; the Darlington tube driver U5 is connected to the control coil of the relay to increase the driving current of the circuit; the serial-to-parallel converter U7 and the latch U6 constitute a serial-to-parallel conversion circuit to convert the serial control signal sent by the main controller into a parallel control signal, which can effectively save the port resources of the main controller. After the control signal increases the driving current through the driver, the relay is powered on and off; the accelerator pedal wiring port P3 is connected to the accelerator pedal on the experimental device, and the accelerator pedal to be tested is electrically connected to the fault setting circuit and the sensor signal measurement interface module. The relays respectively simulate the first and second sensor power supply open circuit faults, the sensor signal short circuit fault to ground, and the sensor signal open circuit fault; specifically, the relay switches K1 and K2 respectively simulate the first and second sensor power supply open circuit faults, the relay switches K3 and K5 simulate the sensor signal short circuit fault to ground, and the relay switches K4 and K6 simulate the sensor signal open circuit fault.

[0042] like Figure 6 As shown, the throttle power supply and drive module includes a precision voltage-stabilized power supply U8, a power adjustment tube Q3, a bias resistor R10, an upper voltage-dividing resistor R11, a lower voltage-dividing resistor R12, and a filter capacitor C9, which constitute a DC 5V constant voltage-stabilized power supply to provide a reference power supply for the position sensor in the throttle body; the stepper motor driver U9 controls the rotation angle of the stepper motor in the throttle body under the control of the main controller.

[0043] like Figure 7As shown, the throttle body fault setting module consists of a fault simulation relay, a pull-down resistor, a relay power driver, a control signal latch, a control signal serial-to-parallel converter, and a throttle body wiring port; the relay simulates the open circuit fault of the throttle body position sensor power supply, the short circuit and open circuit fault of the sensor signal to the ground, and the open circuit fault of the stepper motor drive signal; among them, relay K7 simulates the open circuit fault of the throttle body sensor power supply, relay K8 simulates the open circuit fault of the throttle body stepper motor drive signal, relays K9 and K11 simulate the short circuit fault of the two sensor signals to the ground, and relays K10 and K12 simulate the two The sensor signal is open-circuit fault; the Darlington tube driver U12 is connected to the control coil of the relay to increase the driving current of the circuit; the serial-to-parallel converter U10 and the latch U11 constitute a serial-to-parallel conversion circuit, which converts the serial control signal sent by the main controller into a parallel control signal, which can effectively save the port resources of the main controller. After the control signal increases the driving current through the driver, the relay is powered on and off; the throttle body wiring port P4 is connected to the electronic throttle body on the experimental device, and the electronic throttle body to be tested, the throttle body fault setting module, and the sensor signal measurement interface module are electrically connected.

[0044] like Figure 8 As shown, the sensor angle measurement module consists of a current limiting resistor, an inverter, and an encoder wiring port; the inverter converts the 12V level signal output by the encoder into a 5V level signal compatible with the main controller; the pulse signal output by the encoder is connected to the external interrupt of the main controller, which can improve the circuit's response speed to the encoder pulse signal and improve the accuracy of the angle measurement circuit.

[0045] like Fig. 9 As shown, the sensor signal measurement interface module is composed of measurement interfaces; the measurement interface P5 is connected to the stepper motor drive output port of the throttle power supply and drive module, and the measurement interface P5 is also connected to the throttle position sensor signal after the throttle body fault setting module performs fault simulation, and the experimenter can judge the common power open circuit, signal open circuit, signal short circuit to ground and other faults of the electronic throttle body by measuring the relevant signals of this position; the measurement interface P6 is connected to the reference voltage output of the accelerator pedal position sensor power supply module, and the measurement interface P6 is also connected to the accelerator pedal position sensor signal after the throttle pedal position sensor fault setting module performs fault simulation, and the experimenter can judge the common power open circuit, signal open circuit, signal short circuit to ground and other faults of the accelerator pedal by measuring the relevant signals of this position;

[0046] like Fig.10As shown, the display and key module consists of a liquid crystal display, a contrast adjustment resistor, a key, and a voltage-dividing resistor; the liquid crystal display and the voltage-dividing bias resistor constitute a display circuit, which can display the relevant information and parameters of the experimental device; the key, the voltage-dividing resistor and the analog-to-digital conversion circuit in the main control together constitute a key detection circuit. When the corresponding key is pressed, 0V, 1 / 2VCC, 2 / 3VCC, 3 / 4VCC, and 4 / 5VCC voltage signals are generated in sequence at the resistor near the power supply end. The voltage signal is sent to the main controller for analog-to-digital conversion, and the corresponding key number can be identified. The experimenter can control the experimental device and set parameters through the keys.

[0047] like Fig.11 As shown, the main control is composed of a single-chip microcomputer, a decoupling capacitor, a precision voltage-stabilized power supply, a current-limiting resistor, and a filter capacitor; the precision voltage-stabilized power supply, the current-limiting resistor, and the filter capacitor constitute a 5V precision voltage-stabilized power supply, which provides a reference voltage for the analog-to-digital conversion circuit of the single-chip microcomputer; the single-chip microcomputer is the control core of the entire experimental device, responsible for converting the analog signals of each sensor signal into digital signals, converting the pulse signals of the photoelectric encoder into angle values, controlling the relays of the fault setting circuit to simulate various faults, and performing timing control on the LCD display to complete the display of information and parameters.

[0048] As a preferred embodiment, the training device is also provided with a power supply module. Fig.12 As shown, the power module consists of an AC power interface, a rectifier diode, a filter capacitor, an integrated voltage-stabilized power supply, a freewheeling diode, a filter inductor, a decoupling capacitor, a current-limiting resistor, and a power indicator diode; the power module generates a 12V and 5V DC regulated power supply after diode rectification, capacitor filtering, and voltage stabilization to provide power to the entire experimental device circuit.

[0049] The specific circuit composition and mutual specific connection of the above modules are a better implementation mode of this embodiment, with good control effect and low cost. In practical applications, the circuit can be carried by a PCB board and has a small volume.

[0050] As a preferred implementation, Fig.13As shown, the depth adjustment rod of this embodiment includes a pressure plate 2, a screw rod 3, a butterfly nut 4, and a return spring 5; the screw rod 3 passes through the return spring 5, the pressure plate 2 and the butterfly nut 4 in sequence, and one end of the pressure plate 2 is arranged above the accelerator pedal 1. During the experiment, the position of the pressure plate on the screw rod is changed by adjusting the butterfly nut, so as to apply different pressures to the accelerator pedal to replace the process of people stepping on the accelerator pedal. When the accelerator pedal 1 is adjusted in depth, the butterfly nut 4 is rotated so that one end of the pressure plate 2 contacts the accelerator pedal 1 and continues to press downward. When the accelerator pedal 1 reaches the target depth, it stops rotating. Due to the positioning of the butterfly nut 4 and the support of the return spring 5, the pressure plate 2 remains in place, so that the depth of the accelerator pedal 1 remains unchanged, avoiding the problem of depth jump caused by manual adjustment.

[0051] In the specific implementation, the plane layout of the automobile engine speed control training device is as follows: Figure 3 shown.

[0052] The accelerator pedal and electronic throttle body are set on the platform as training research objects. The electronic throttle body is the intake control assembly of the automobile engine electronic control system, which includes throttle plate, stepper motor, position sensor and other components. Under the control of the engine electronic control module, the throttle plate can control the intake of the engine. The internal throttle position sensor can convert the opening angle of the valve plate into a corresponding electrical signal to the engine electronic control module. As a sensor assembly of the automobile engine electronic control system, the electronic throttle includes pedals, bases, return springs, position sensors and other components. During the driving process of the car, the driver's accelerator pedaling depth is converted into a corresponding electrical signal to the engine electronic control module, providing a basis for its decision-making.

[0053] The depth adjustment rod is arranged on the platform for easy adjustment operation.

[0054] The sensor signal measurement interface module is divided into the first sensor signal measurement area and the second sensor signal measurement area, which correspond to Figure 3 There are sensor signal measurement area 1 and sensor signal measurement area 2 in the middle; sensor signal measurement area 1 is equipped with 6 measurement terminals, which are respectively connected to the power supply and signal of two groups of accelerator pedal position sensors; sensor signal measurement area 2 is equipped with 6 measurement terminals, which are respectively connected to the stepper motor control signal of the electronic throttle body and the power supply and signal of the throttle position sensor. During the experiment, the relevant signals can be measured to achieve the experimental purposes of studying the signal characteristics of the sensor and judging the cause of the fault.

[0055] The power control area is equipped with a power switch, indicator light, and a DC 12V measurement terminal to control the power supply of the experimental device and indicate the working status. The DC 12V measurement terminal is used to compare the power supply voltage during the test.

[0056] The function key area is equipped with five keys: "up, down, left, right, and confirm". The experimenter can complete the relevant operations and settings of the experimental device by operating the keys in combination with the LCD display.

[0057] The LCD screen displays parameters such as the accelerator pedal position sensor signal voltage, pedal depth percentage, throttle position sensor signal voltage, throttle opening, and related content of the experimental device control system.

[0058] The photoelectric encoder 1 is rigidly connected to the throttle valve plate shaft in the electronic throttle body to measure its rotation angle. The photoelectric encoder 2 is rigidly connected to the accelerator pedal shaft to measure its rotation angle.

[0059] The automobile engine speed control training device of this embodiment has the characteristics of strong operability, convenient operation, low cost and good visibility.

[0060] Example 2

[0061] This embodiment is a control method of the automobile engine speed control training device based on Embodiment 1. The control method is as follows.

[0062] S1. Control the accelerator pedal;

[0063] Adjust the depth adjustment lever to change the accelerator pedal's stepping depth, output two analog signals proportional to the pedal's stepping depth, and send them to the analog-to-digital conversion channel of the main controller through the accelerator pedal position sensor fault setting module to convert them into corresponding digital values. The pedal sensor voltage and the corresponding accelerator depth percentage are displayed on the LCD through the display and key module, thereby simulating the process of the automobile engine electronic control system detecting the accelerator pedal's stepping depth;

[0064] The photoelectric encoder in the sensor angle measurement module rigidly connected to the accelerator pedal shaft outputs a pulse signal consistent with the pedal's rotation angle in real time to the main controller, which converts it into a corresponding angle value and displays it through the display and key module, providing the experimenter with a comparison between the angle detected by the main controller and the actual rotation angle to verify the correctness of the accelerator pedal sensor and detection circuit;

[0065] The main controller is used to control the accelerator pedal position sensor fault setting module to set two power supply open circuit faults, two signal open circuit faults, and two signal short circuit faults; the sensor signal measurement interface module is used to measure the output voltage of the sensor and compare it with the sensor voltage value displayed by the display and button module.

[0066] like Fig.14As shown, when actually performing the accelerator pedal control experiment operation, the accelerator pedal fault can be set in advance through the display and button module; the experimenter changes the accelerator pedal depth by adjusting the depth adjustment rod; observes the depth value, voltage value and other parameters of the accelerator pedal on the display screen, and then uses tools such as a multimeter and an oscilloscope to measure the signal. The output signal of the accelerator pedal is measured through the first sensor signal measurement area. By comparing the value on the display screen with the corresponding measured value, it is judged whether the accelerator pedal is normal. If it is abnormal, the cause of the fault is analyzed through data. After determining the fault location with the help of instruments and equipment, the management interface is entered through the operation button with the cooperation of the display screen to restore the fault. If the data between the two is normal, the current experimental data is recorded, and the depth adjustment rod is adjusted again to change the accelerator pedal depth and record the current experimental data. After repeated experiments, the experimental data is analyzed to achieve the experimental purpose of studying the characteristics of sensor signals.

[0067] S2. Perform electronic throttle control;

[0068] The main controller is input with a signal through the operation display and key module, and the main controller controls the opening angle of the driving motor of the throttle body to be between 3% and 97%. The main controller sends a control signal to the stepper motor in the electronic throttle body through the throttle body fault setting module, and controls the throttle plate in the electronic throttle body to rotate along the rotating shaft to a corresponding angle, thereby simulating the control process of the electronic throttle body by the automobile engine electronic control system;

[0069] The photoelectric encoder in the sensor angle measurement module rigidly connected to the electronic throttle body shaft outputs a pulse signal consistent with the rotation angle of the throttle valve plate of the throttle body to the main controller in real time. The main controller converts it into a corresponding angle value and displays it through the display and key module, providing the experimenter with a comparison between the angle obtained by the throttle position sensor in the electronic throttle body detected by the main controller and the actual rotation angle of the throttle valve plate, thereby verifying the correctness of the throttle position sensor and the detection circuit;

[0070] The throttle body fault setting module is controlled by the main controller to simulate power open circuit, throttle signal open circuit, and throttle signal short circuit to ground faults; the output voltage of the sensor in the electronic throttle body is measured and compared with the sensor voltage value displayed by the display and button module; the output voltage of the sensor in the electronic throttle body is measured and compared with the sensor voltage value displayed by the display and button module.

[0071] like Fig.15As shown in the figure, the process of the electronic throttle control experiment is: set the throttle fault in advance through the display and button module; the fault setting includes four types of faults: sensor power open circuit, stepper motor drive open circuit, two-way signal open circuit, and two-way signal short circuit to ground. Then adjust the throttle opening angle through the buttons in the experiment management interface, and then observe the throttle opening value, voltage value, angle and other parameters on the display screen, and then use tools such as multimeters and oscilloscopes to measure the output signal of the throttle body in the signal measurement area, observe and analyze whether the data between the two is normal, if not, analyze the cause of the fault through data, determine the fault location with the help of instruments and equipment, and enter the management interface to restore the fault through the operation buttons with the cooperation of the display screen. If the data between the two is normal, record the current experimental data, adjust the throttle opening angle through the buttons again and record the current experimental data. After repeated experiments, the experimental purpose of studying the characteristics of sensor signals is achieved by analyzing the experimental data.

[0072] S3. Perform engine throttle control;

[0073] The accelerator pedal is adjusted according to the step S1, and the experimenter's throttle control intention is input into the main controller, which controls the throttle valve plate in the electronic throttle body to move, and the throttle position sensor in the throttle body monitors the rotation angle of the valve plate to realize closed-loop control, thereby realizing the process of simulating the throttle control of the automobile engine.

[0074] like Fig.16As shown in the figure, the process of the engine throttle control experiment is: the experimenter enters the experiment management interface of the experimental device control system through the operation button with the cooperation of the display screen, sets the fault of the accelerator pedal and the throttle valve, and then adjusts the depth adjustment lever to change the accelerator pedal stepping depth, and then observes the depth value, voltage value and other parameters of the accelerator pedal on the display screen, and then uses a multimeter, oscilloscope and other tools to measure the output signal of the accelerator pedal in the signal measurement area, observes and analyzes whether the data between the two is normal, if not, analyzes the cause of the fault through data, determines the fault location with the help of instruments and equipment, and then enters the management interface with the cooperation of the display screen through the operation button to restore the fault, if the data between the two is normal, then enters the subsequent experiment Test process; then observe the throttle opening value, voltage value, angle and other parameters on the display screen, and then use multimeter, oscilloscope and other tools to measure the output signal of the throttle body in the signal measurement area, observe and analyze whether the data between the two is normal, if not, analyze the cause of the fault through data, determine the fault location with the help of instruments and equipment, and enter the management interface with the cooperation of the display screen through operating buttons to restore the fault, if the data between the two is normal, record the current experimental data of the accelerator pedal and throttle, adjust the depth adjustment lever again to change the accelerator pedal depth and record the current experimental data of the accelerator pedal and throttle, and after repeated experiments, analyze the experimental data to achieve the experimental purpose of studying the working principle of the automobile engine throttle control system.

[0075] This embodiment can realize experiments on sensor parameters and control system output through the automobile engine speed control training device, including accelerator pedal control experiment, throttle body control experiment and engine throttle control experiment; its training device can simulate real engine speed control, the experiment is highly operable, the experimental process is intuitive and the cost is low.

[0076] Obviously, the above embodiments are merely examples for clearly explaining the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the protection of the claims of the present invention.

Claims

1. A vehicle engine speed control training device, characterized in that: The device comprises an accelerator pedal, a depth adjustment rod for adjusting the depth of the accelerator pedal, an electronic throttle body, an accelerator pedal position sensor fault setting module, an accelerator pedal position sensor power supply module, a sensor angle measurement module, a throttle body fault setting module, a throttle power supply and drive module, a display and button module, and a main controller; an accelerator pedal position sensor is provided at the accelerator pedal, and the accelerator pedal position sensor is connected to the main controller through the accelerator pedal position sensor fault setting module; the sensor angle measurement module respectively measures the rotation shaft angle of the accelerator pedal and the rotation shaft angle of the electronic throttle body and transmits them to the main controller; the electronic throttle body is connected to the main controller through the throttle body fault setting module; the accelerator pedal position sensor power supply module is connected to the accelerator pedal position sensor fault setting module; the throttle power supply and drive module are respectively connected to the throttle body fault setting module and the main controller; the main controller is connected to the display and button module; The throttle body fault setting module includes a fault simulation relay, a pull-down resistor, a relay power driver, a control signal latch, a control signal serial-to-parallel converter, and a throttle body wiring port; the fault simulation relay simulates the open circuit fault of the power supply of the position sensor in the throttle body, the short circuit and open circuit fault of the sensor signal to the ground, and the open circuit fault of the stepper motor drive signal; the relay power driver is connected to the control coil of the fault simulation relay; the control signal serial-to-parallel converter and the control signal latch constitute a serial-to-parallel conversion circuit, which converts the serial control signal sent by the main controller into a parallel control signal, and after the control signal increases the driving current through the relay power driver, the fault simulation relay is powered on and off; the throttle body wiring port is connected to the electronic throttle body.

2. The automobile engine speed control training device according to claim 1 is characterized in that: The training device also includes a sensor signal measurement interface module, which is divided into a first sensor signal measurement area and a second sensor signal measurement area; the first sensor signal measurement area is provided with measurement terminals, which are respectively connected to the power supply and signals of two groups of accelerator pedal position sensors; the second sensor signal measurement area is provided with measurement terminals, which are respectively connected to the stepper motor control signal of the electronic throttle body and the power supply and signal of the throttle position sensor.

3. The automobile engine speed control training device according to claim 1 is characterized in that: The depth adjustment rod comprises a screw rod, a butterfly nut, a pressure plate, and a return spring; the screw rod passes through the return spring, the pressure plate, and the butterfly nut in sequence, and one end of the pressure plate is arranged above the accelerator pedal.

4. A control method for a vehicle engine speed control training device, characterized in that: The automobile engine speed control training device according to any one of claims 1 to 3 is applied; the control method comprises: S1. Perform accelerator pedal control; Adjust the depth adjustment lever to change the accelerator pedal's stepping depth, output two analog signals proportional to the pedal's stepping depth, and send them to the analog-to-digital conversion channel of the main controller through the accelerator pedal position sensor fault setting module to convert them into corresponding digital values. The pedal sensor voltage and the corresponding accelerator depth percentage are displayed through the display and key module, thereby simulating the process of the automobile engine electronic control system detecting the accelerator pedal's stepping depth; The photoelectric encoder in the sensor angle measurement module rigidly connected to the accelerator pedal shaft outputs a pulse signal consistent with the pedal's rotation angle in real time to the main controller, which converts it into a corresponding angle value and displays it through the display and key module, providing the experimenter with a comparison between the angle detected by the main controller and the actual rotation angle to verify the correctness of the accelerator pedal sensor and detection circuit; The main controller is used to control the accelerator pedal position sensor fault setting module to set power supply open circuit fault, accelerator pedal signal open circuit fault, and accelerator pedal signal short circuit fault; the sensor output voltage is measured through the sensor signal measurement interface module, and compared with the sensor voltage value displayed by the display and button module; S2. Perform electronic throttle control; The main controller controls the opening angle of the driving motor of the electronic throttle body by inputting signals through the operation display and key module. The main controller sends a control signal to the stepper motor in the electronic throttle body through the throttle body fault setting module to control the throttle valve plate in the electronic throttle body to rotate along the rotating shaft to a corresponding angle, thereby simulating the control process of the electronic throttle body by the electronic control system of the automobile engine; The photoelectric encoder in the sensor angle measurement module rigidly connected to the electronic throttle body shaft outputs a pulse signal consistent with the rotation angle of the throttle valve plate of the throttle body to the main controller in real time. The main controller converts it into a corresponding angle value and displays it through the display and key module, providing the experimenter with a comparison between the angle obtained by the throttle position sensor in the electronic throttle body detected by the main controller and the actual rotation angle of the throttle valve plate, thereby verifying the correctness of the throttle position sensor and the detection circuit; The main controller controls the throttle body fault setting module to simulate power open circuit, throttle signal open circuit, and throttle signal short circuit to ground faults; the output voltage of the sensor in the electronic throttle body is measured and compared with the sensor voltage value displayed by the display and button module; the output voltage of the sensor in the electronic throttle body is measured and compared with the sensor voltage value displayed by the display and button module; S3. Perform engine throttle control; The accelerator pedal is adjusted according to the step S1, and the experimenter's throttle control intention is input into the main controller, which controls the throttle valve plate in the electronic throttle body to move, and the throttle position sensor in the throttle body monitors the rotation angle of the valve plate to realize closed-loop control, thereby realizing the process of simulating the throttle control of the automobile engine.

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