Accelerator simulation device

Abstract

The utility model discloses an accelerator simulation device, and the device comprises a signal generation circuit which is used for generating a target pulse width modulation signal; a first power supply circuit; the voltage conversion circuit is connected with the signal output end of the signal generation circuit and the voltage output end of the first power supply circuit, and is used for converting the power supply voltage output by the first power supply circuit into a target voltage signal by using a target pulse width modulation signal; wherein the voltage of the target voltage signal represents the opening degree of the accelerator. The accelerator simulation device can accurately simulate the accelerator opening degree generated by the accelerator pedal, and the accuracy and efficiency of vehicle power testing are improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a throttle simulation device. Background Art

[0002] Currently, testers need to stabilize the vehicle's accelerator pedal at different throttle openings (such as 10%, 20%, 50%, 60%, 75%, 90%, etc.) to conduct vehicle dynamics testing.

[0003] However, during vehicle dynamics testing, testers typically control the throttle opening by pressing the accelerator pedal. This operation challenges the tester's ability to control the pedal, making it difficult to accurately stabilize the throttle opening to a fixed value, resulting in low test accuracy and efficiency. Utility Model Content

[0004] The main technical problem solved by this application is to provide a throttle simulation device that can accurately simulate the throttle opening and improve the accuracy and efficiency of vehicle power testing.

[0005] In order to solve the above technical problems, the present application provides a throttle simulation device, which includes: a signal generating circuit for generating a target pulse width modulation signal; a first power supply circuit; a voltage conversion circuit, which is connected to the signal output end of the signal generating circuit and the voltage output end of the first power supply circuit, and is used to use the target pulse width modulation signal to convert the power supply voltage output by the first power supply circuit into a target voltage signal; wherein the voltage magnitude of the target voltage signal represents the magnitude of the throttle opening.

[0006] Optionally, the voltage conversion circuit includes a step-down circuit, the voltage input end of the step-down circuit is connected to the voltage output end of the first power supply circuit, the signal input end of the step-down circuit is connected to the signal output end of the signal generating circuit, and the voltage output end of the step-down circuit is used to output the target voltage signal.

[0007] Optionally, the voltage conversion circuit also includes a driving circuit, and the throttle simulation device also includes a second power supply circuit, the power supply end of the driving circuit is connected to the voltage output end of the second power supply circuit, the signal input end of the driving circuit is connected to the signal output end of the signal generating circuit, and the signal output end of the driving circuit is connected to the signal input end of the step-down circuit.

[0008] Optionally, the target pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, the signal generating circuit includes a first signal output terminal for outputting the first pulse width modulation signal and a second signal output terminal for outputting the second pulse width modulation signal; the first power supply circuit includes a first power supply for outputting a first power supply voltage and a second power supply for outputting a second power supply voltage; the driving circuit includes a first driving sub-circuit and a second driving sub-circuit; the step-down circuit includes a first step-down sub-circuit and a second step-down sub-circuit, and the target voltage signal includes a first voltage signal and a second voltage signal. Among them, the signal input end of the first driving sub-circuit is connected to the first signal output end of the signal generating circuit, the signal output end of the first driving sub-circuit is connected to the signal input end of the first step-down sub-circuit, the voltage input end of the first step-down sub-circuit is connected to the voltage output end of the first power supply, and the voltage output end of the first step-down sub-circuit is used to output a first voltage signal; the signal input end of the second driving sub-circuit is connected to the second signal output end of the signal generating circuit, the signal output end of the second driving sub-circuit is connected to the signal input end of the second step-down sub-circuit, the voltage input end of the second step-down sub-circuit is connected to the voltage output end of the second power supply, and the voltage output end of the second step-down sub-circuit is used to output a second voltage signal; the power supply end of the first driving sub-circuit and the power supply end of the second driving sub-circuit are both connected to the voltage output end of the second power supply circuit.

[0009] Optionally, the target step-down subcircuit includes a first voltage stabilizing unit, a first switching tube, a first diode, an inductor, and a second voltage stabilizing unit, and the target step-down subcircuit is either the first step-down subcircuit or the second step-down subcircuit. The first end of the first voltage stabilizing unit is connected to the first end of the first switching tube, the second end of the first switching tube is connected to the cathode of the first diode and the first end of the inductor, the second end of the inductor is connected to the first end of the second voltage stabilizing unit, the second end of the first voltage stabilizing unit, the anode of the first diode, and the second end of the second voltage stabilizing unit are all connected to ground, the first end of the first voltage stabilizing unit is a voltage input end of the target step-down subcircuit, the first end of the second voltage stabilizing unit is a voltage output end of the target step-down subcircuit, and the controlled end of the first switching tube is a signal input end of the target step-down subcircuit.

[0010] Optionally, the target driver subcircuit includes a second switching transistor and a third switching transistor, and the target driver subcircuit is either the first driver subcircuit or the second driver subcircuit. A first end of the second switching transistor is connected to a voltage output end of the second power supply circuit, a second end of the second switching transistor is connected to a first end of the third switching transistor, a second end of the third switching transistor is grounded, a controlled end of the second switching transistor is connected to a controlled end of the third switching transistor, the controlled end of the second switching transistor serves as a signal input end of the target driver subcircuit, and a second end of the second switching transistor serves as a signal output end of the target driver subcircuit.

[0011] Optionally, the throttle simulation device also includes an anti-backflow circuit, a first end of the anti-backflow circuit is connected to the voltage output end of the second power supply circuit, and a second end of the anti-backflow circuit is connected to the power supply end of the drive circuit, and the anti-backflow circuit is used to prevent the large current in the drive circuit from flowing back into the second power supply circuit; and / or, the throttle simulation device also includes a coupling capacitor, one end of the coupling capacitor is connected to the power supply end of the drive circuit, and the other end of the coupling capacitor is connected to one end of the inductor in the step-down circuit.

[0012] Optionally, the signal output end of the voltage conversion circuit is used to connect to a vehicle controller, and the vehicle controller is used to determine the target throttle opening corresponding to the target voltage signal and generate a control instruction corresponding to the target throttle opening; wherein the control instruction is used to control the power output of the vehicle.

[0013] Optionally, the throttle simulation device also includes an input device connected to the signal generating circuit, the input device is used to obtain signal parameters input by the tester and send the signal parameters to the signal generating circuit, and the signal generating circuit is used to generate the target pulse width modulation signal after receiving the signal parameters; wherein the signal parameters include signal frequency and signal duty cycle.

[0014] Optionally, the input device is further communicatively connected to a data reading interface of an on-board automatic diagnostic system, and the input device is further configured to obtain a target throttle opening fed back by a vehicle controller through the data reading interface.

[0015] In the above scheme, the throttle simulation device includes a signal generation circuit, a first power supply circuit, and a voltage conversion circuit. The signal generation circuit is used to generate a target pulse width modulation signal, and the voltage conversion circuit is used to convert the power supply voltage output by the first power supply circuit into a target voltage signal using the target pulse width modulation signal. Because the voltage of the converted target voltage signal represents the magnitude of the throttle opening, when conducting vehicle dynamics testing, the tester can connect the throttle simulation device to the vehicle to accurately simulate the throttle opening generated by the accelerator pedal, without the tester having to step on the accelerator pedal to perform the test, thereby improving the accuracy and efficiency of vehicle dynamics testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of an embodiment of a throttle simulation device provided by the present application;

[0017] Figure 2 It is a structural diagram of another embodiment of the throttle simulation device provided by the present application;

[0018] Figure 3 This is a structural diagram of another embodiment of the throttle simulation device provided by the present application;

[0019] Figure 4 It is a schematic diagram of the corresponding relationship between throttle opening and voltage provided in this application;

[0020] Figure 5 is a structural diagram of an embodiment of a target driving sub-circuit provided by the present application;

[0021] Figure 6 Schematic diagram of the structure of an embodiment of the target step-down sub-circuit provided in this application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and effects of this application clearer and more specific, this application is further described in detail below with reference to the accompanying drawings and examples.

[0023] It should be noted that the term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] See also Figure 1 , Figure 1 This is a structural diagram of an embodiment of the throttle simulation device provided by this application. Figure 1 As shown, the throttle simulation device includes a signal generating circuit 10 , a first power supply circuit 20 and a voltage conversion circuit 30 .

[0025] Among them, the signal generating circuit 10 is used to generate a target PWM signal (i.e., a target pulse width modulation signal). The signal parameters of the target PWM signal can be fixed, or the signal parameters of the target PWM signal can be adjustable. The signal parameters of the target PWM signal include the signal frequency and signal duty cycle of the target PWM signal. Exemplarily, the signal generating circuit 10 can be a dedicated PWM chip, an analog circuit capable of generating a PWM signal built by discrete circuit components, or a controller (such as an MCU, FPGA, etc.) with an internally integrated PWM generation module, which is not specifically limited in this embodiment.

[0026] The first power supply circuit 20 is used to provide the power supply voltage required for voltage conversion. The first power supply circuit 20 can be designed according to actual test requirements, or a suitable power supply can be selected according to actual test requirements.

[0027] The voltage conversion circuit 30 is connected to the signal output terminal of the signal generation circuit 10 and the voltage output terminal of the first power supply circuit 20. Specifically, the voltage conversion circuit 30 includes a voltage input terminal, a signal input terminal, and a voltage output terminal. The voltage input terminal of the voltage conversion circuit 30 is connected to the voltage output terminal of the first power supply circuit 20, and the signal input terminal of the voltage conversion circuit 30 is connected to the signal output terminal of the signal generation circuit 10. The voltage conversion circuit 30 is used to convert the power supply voltage output by the first power supply circuit 20 into a target voltage signal using a target PWM signal. The voltage level of the target voltage signal represents the throttle opening.

[0028] When the tester needs to simulate a certain throttle opening, a target PWM signal with a corresponding duty cycle can be generated by the signal generation circuit 10. The target PWM signal is then sent to the voltage conversion circuit 30. The voltage conversion circuit 30 converts the power supply voltage output by the first power supply circuit 20 into a corresponding target voltage signal according to the duty cycle of the target PWM signal.

[0029] In this embodiment, the throttle simulation device includes a signal generation circuit, a first power supply circuit, and a voltage conversion circuit. The signal generation circuit is used to generate a target PWM signal, and the voltage conversion circuit is used to convert the power supply voltage output by the first power supply circuit into a target voltage signal using the target PWM signal. Because the magnitude of the converted target voltage signal represents the throttle opening, during vehicle dynamics testing, the tester can connect the throttle simulation device to the vehicle to accurately simulate the throttle opening generated by the accelerator pedal, eliminating the need for the tester to physically press the accelerator pedal. This improves the accuracy and efficiency of vehicle dynamics testing.

[0030] See also Figure 2 , Figure 2 It is a structural diagram of another embodiment of the throttle simulation device provided by this application. Figure 2 In the illustrated throttle simulation device, the voltage conversion circuit 30 includes a step-down circuit 31. Specifically, the voltage input terminal of the step-down circuit 31 is connected to the voltage output terminal of the first power supply circuit 20, the signal input terminal of the step-down circuit 31 is connected to the signal output terminal of the signal generation circuit 10, and the voltage output terminal of the step-down circuit 31 is used to output a target voltage signal.

[0031] In this embodiment, the voltage of the target voltage signal is the product of the input voltage of the step-down circuit 31 (i.e., the power supply voltage output by the first power supply circuit 20) and the duty cycle of the input signal of the step-down circuit 31 (i.e., the duty cycle of the target PWM signal). Therefore, by adjusting the duty cycle of the input target PWM signal, the voltage of the output target voltage signal can be adjusted, thereby adjusting the simulated throttle opening. When testing the dynamic performance of a vehicle, the tester can use the throttle simulation device to simulate different throttle openings, thereby performing dynamic performance tests at different throttle openings without actually stepping on the accelerator pedal, thereby improving the accuracy and efficiency of the test.

[0032] See also Figure 3 , Figure 3 FIG. 1 is a structural diagram of another embodiment of the throttle simulation device provided by this application. Figure 3 As shown, the throttle simulation device includes a signal generating circuit 10 , a first power supply circuit 20 , a voltage conversion circuit 30 and a second power supply circuit 40 . The voltage conversion circuit 30 includes a driving circuit 32 and a step-down circuit 31 .

[0033] The power supply terminal of the drive circuit 32 is connected to the voltage output terminal of the second power supply circuit 40. The signal input terminal of the drive circuit 32 is connected to the signal output terminal of the signal generation circuit 10. The signal output terminal of the drive circuit 32 is connected to the signal input terminal of the step-down circuit 31. The voltage input terminal of the step-down circuit 31 is connected to the voltage output terminal of the first power supply circuit 20. The voltage output terminal of the step-down circuit 31 is used to output a target voltage signal. The step-down circuit 31 is used to convert the power supply voltage output by the first power supply circuit 20 into a target voltage signal using the target PWM signal. The voltage magnitude of the target voltage signal represents the throttle opening. The drive circuit 32 is used to improve the driving capability of the target PWM signal so that the step-down circuit 31 can accurately and stably output the target voltage signal, thereby improving the stability of the entire throttle simulation device.

[0034] In one embodiment, a throttle simulation device is used to simulate and generate two signals for an accelerator pedal. In this embodiment, the target PWM signal includes a first PWM signal and a second PWM signal. The signal generation circuit 10 includes a first signal output terminal for outputting the first PWM signal and a second signal output terminal for outputting the second PWM signal. The first power supply circuit 20 includes a first power supply 21 for outputting a first power supply voltage and a second power supply 22 for outputting a second power supply voltage. The drive circuit 32 includes a first drive sub-circuit 321 and a second drive sub-circuit 322. The step-down circuit 31 includes a first step-down sub-circuit 311 and a second step-down sub-circuit 312. The target voltage signal includes a first voltage signal and a second voltage signal.

[0035] The power supply terminal of the first driver sub-circuit 321 is connected to the voltage output terminal of the second power supply circuit 40. The signal input terminal of the first driver sub-circuit 321 is connected to the first signal output terminal of the signal generation circuit 10. The signal output terminal of the first driver sub-circuit 321 is connected to the signal input terminal of the first step-down sub-circuit 311. The voltage input terminal of the first step-down sub-circuit 311 is connected to the voltage output terminal of the first power supply 21. The voltage output terminal of the first step-down sub-circuit 311 is configured to output a first voltage signal. The first driver sub-circuit 321 is configured to improve the driving capability of the first PWM signal. The first step-down sub-circuit 311 is configured to convert the first power supply voltage into a first voltage signal using the first PWM signal. The voltage of the first voltage signal is the product of the first power supply voltage and the first duty cycle of the first PWM signal.

[0036] The power supply terminal of the second driver sub-circuit 322 is connected to the voltage output terminal of the second power supply circuit 40. The signal input terminal of the second driver sub-circuit 322 is connected to the second signal output terminal of the signal generation circuit 10. The signal output terminal of the second driver sub-circuit 322 is connected to the signal input terminal of the second step-down sub-circuit 312. The voltage input terminal of the second step-down sub-circuit 312 is connected to the voltage output terminal of the second power supply 22. The voltage output terminal of the second step-down sub-circuit 312 is configured to output a second voltage signal. The second driver sub-circuit 322 is configured to improve the driving capability of the second PWM signal. The second step-down sub-circuit 312 is configured to convert the second power supply voltage into a second voltage signal using the second PWM signal. The voltage of the second voltage signal is the product of the second power supply voltage and the second duty cycle of the second PWM signal.

[0037] The first voltage signal and the second voltage signal are two signals simulating an accelerator pedal. The magnitude of the first voltage signal and the magnitude of the second voltage signal both represent the throttle opening. The magnitude of the first voltage signal is proportional to the throttle opening, and the magnitude of the second voltage signal is also proportional to the throttle opening. The voltage of the first voltage signal is a preset multiple of the voltage of the second voltage signal. For example, the preset multiple is 2.

[0038] In one example, the first power supply voltage is a predetermined multiple of the second power supply voltage, and the first duty cycle of the first PWM signal is the same as the second duty cycle of the second PWM signal, such that the voltage of the first voltage signal is a predetermined multiple of the voltage of the second voltage signal. For example, the first power supply voltage is 5V and the second power supply voltage is 2.5V. In this case, the first power supply 21 and the second power supply 22 are separate power supplies.

[0039] In another example, the first power supply voltage is the same as the second power supply voltage, and the first duty cycle of the first PWM signal is a predetermined multiple of the second duty cycle of the second PWM signal, such that the voltage of the first voltage signal is a predetermined multiple of the voltage of the second voltage signal. For example, the first power supply voltage and the second power supply voltage are both 5V. In this case, the first power supply 21 and the second power supply 22 can be the same power supply, or the first power supply 21 and the second power supply 22 can be separately provided power supplies.

[0040] Figure 4 This is a schematic diagram of the corresponding relationship between the throttle opening and voltage provided in this application. Figure 4 Signal 1 and Signal 2 represent the first and second voltage signals, respectively. When the first voltage signal is 0.75V and the second voltage signal is 0.375V, the corresponding throttle opening is 0%. When the first voltage signal is 4V and the second voltage signal is 2V, the corresponding throttle opening is 100%.

[0041] The second power supply circuit 40 includes a third power supply (not shown in the figure). Exemplarily, the power supply voltage output by the third power supply is 12V.

[0042] In this embodiment, the first driving sub-circuit 321 and the second driving sub-circuit 322 have the same circuit structure, and the details may refer to the circuit structure of the target driving sub-circuit below.

[0043] Figure 5 3 is a schematic diagram of a target driving sub-circuit according to an embodiment of the present invention, wherein the target driving sub-circuit is any one of the first driving sub-circuit 321 and the second driving sub-circuit 322. Figure 5 As shown, the target drive sub-circuit includes a second switch tube 32a and a third switch tube 32b. The first end of the second switch tube 32a is connected to the voltage output end of the second power supply circuit 40 (the first end of the second switch tube 32a is the power supply end of the target drive sub-circuit), the second end of the second switch tube 32a is connected to the first end of the third switch tube 32b, the second end of the third switch tube 32b is grounded, the controlled end of the second switch tube 32a is connected to the controlled end of the third switch tube 32b, the controlled end of the second switch tube 32a is the signal input end of the target drive sub-circuit, and the second end of the second switch tube 32a is the signal output end of the target drive sub-circuit. Optionally, in other embodiments, the target drive sub-circuit can also be other circuits that can improve the signal driving capability, which are not listed here.

[0044] Exemplarily, the second switch transistor 32a is a PMOS transistor and the third switch transistor 32b is an NMOS transistor. The first end, the second end, and the controlled end of the second switch transistor 32a are the source, the drain, and the gate of the second switch transistor 32a, respectively. The first end, the second end, and the controlled end of the third switch transistor 32b are the drain, the source, and the gate of the third switch transistor 32b, respectively. When the input first PWM signal or the second PWM signal is high, the second switch transistor 32a is in the off state, the third switch transistor 32b is in the on state, and the target driver sub-circuit output signal is low. When the input first PWM signal or the second PWM signal is low, the second switch transistor 32a is in the on state, the third switch transistor 32b is in the off state, and the target driver sub-circuit output signal is high.

[0045] In this embodiment, the first buck sub-circuit 311 and the second buck sub-circuit 312 have the same circuit structure, and the details may refer to the circuit structure of the target buck sub-circuit below.

[0046] Figure 6 : is a schematic diagram of the structure of an embodiment of the target buck sub-circuit provided in this application, and the target buck sub-circuit is one of the first buck sub-circuit 311 and the second buck sub-circuit 312. Figure 6 As shown, the target step-down sub-circuit includes a first voltage stabilizing unit 31a, a first switching transistor 31b, a first diode 31c, an inductor 31d, and a second voltage stabilizing unit 31e. The first end of the first voltage stabilizing unit 31a is connected to the first end of the first switching transistor 31b, the second end of the first switching transistor 31b is connected to the cathode of the first diode 31c and the first end of the inductor 31d, the second end of the inductor 31d is connected to the first end of the second voltage stabilizing unit 31e, the second end of the first voltage stabilizing unit 31a, the anode of the first diode 31c, and the second end of the second voltage stabilizing unit 31e are all connected to ground. The first end of the first voltage stabilizing unit 31a serves as a voltage input terminal of the target step-down sub-circuit, the first end of the second voltage stabilizing unit 31e serves as a voltage output terminal of the target step-down sub-circuit, and the controlled end of the first switching transistor 31b serves as a signal input terminal of the target step-down sub-circuit.

[0047] The first voltage stabilizing unit 31a includes at least one capacitor. For example, the first voltage stabilizing unit 31a includes a first capacitor c1 and a second capacitor c2. The first capacitor c1 has a capacitance of 47 μF, and the second capacitor c2 has a capacitance of 10 μF. When the target step-down subcircuit is the first step-down subcircuit 311, the first voltage stabilizing unit 31a is used to stabilize the input first power supply voltage. When the target step-down subcircuit is the second step-down subcircuit 312, the first voltage stabilizing unit 31a is used to stabilize the input second power supply voltage.

[0048] The second voltage stabilizing unit 31e includes at least one capacitor. Exemplarily, the second voltage stabilizing unit 31e includes a third capacitor C3 and a fourth capacitor C4. The third capacitor C3 has a capacitance of 22 μF, and the fourth capacitor C4 has a capacitance of 47 μF. When the target step-down subcircuit is the first step-down subcircuit 311, the second voltage stabilizing unit 31e is used to stabilize the voltage of the output first voltage signal. When the target step-down subcircuit is the second step-down subcircuit 312, the second voltage stabilizing unit 31e is used to stabilize the voltage of the output second voltage signal.

[0049] Exemplarily, the first switch tube 31 b is an NMOS tube, and the first end, the second end and the controlled end of the first switch tube 31 b are the drain, the source and the gate of the first switch tube 31 b respectively.

[0050] Exemplarily, the inductance 31d of the inductor 31d is 6.8 μH.

[0051] It should be noted that, in the above embodiment, only the throttle simulation device is used to simulate and generate two signals of the accelerator pedal for exemplary description. In other embodiments, the throttle simulation device may also be used to simulate and generate only one signal of the accelerator pedal.

[0052] Furthermore, the signal output terminal of the voltage conversion circuit 30 in this embodiment is connected to a vehicle controller (not shown). The vehicle controller is used to determine the target throttle opening corresponding to the target voltage signal and generate a control instruction corresponding to the target throttle opening. The control instruction is used to control the power output of the vehicle.

[0053] In other embodiments, the signal output terminal of the voltage conversion circuit 30 is used to connect to the signal terminal of the throttle sensor (accelerator pedal position sensor), and the signal terminal of the throttle sensor is connected to the vehicle controller. The vehicle controller can obtain the target voltage signal output by the voltage conversion circuit 30 through the signal terminal of the throttle sensor. Specifically, the throttle sensor includes 6 pins, namely: Pin 1, Pin 2, Pin 3, Pin 4, Pin 5, and Pin 6, and the corresponding functions are: Power 1, Power 2, Ground 1, Signal 1, Ground 2, and Signal 2. The voltage output terminal of the first step-down sub-circuit 311 is connected to Pin 4 corresponding to Signal 1, the voltage output terminal of the second step-down sub-circuit 312 is connected to Pin 6 corresponding to Signal 2, the ground terminal of the first step-down sub-circuit 311 is connected to Pin 3 corresponding to Ground 1, and the ground terminal of the second step-down sub-circuit 312 is connected to Pin 5 corresponding to Ground 2.

[0054] Please refer again Figure 3The throttle simulation device may further include an input device 50 connected to the signal generation circuit 10. The input device 50 is configured to obtain signal parameters input by a tester and transmit the signal parameters to the signal generation circuit 10. The signal generation circuit 10 is configured to generate a target PWM signal after receiving the signal parameters. Exemplarily, the target PWM signal includes the aforementioned first PWM signal and second PWM signal, and the signal parameters input by the tester include the signal frequency and signal duty cycle of the first PWM signal, and the signal frequency and signal duty cycle of the second PWM signal.

[0055] For example, the signal generating circuit 10 may be a controller capable of generating a PWM signal. The input device 50 may be a touch screen display, a terminal device, or the like connected to the signal generating circuit 10. For example, the terminal device may be a mobile phone, a tablet computer, a laptop computer, a desktop computer, or the like, which is not specifically limited in this embodiment.

[0056] Exemplarily, the input device 50 is connected to the signal generating circuit 10 via a CAN box.

[0057] For example, when a tester needs to test the vehicle's dynamic performance at a specific throttle opening, they can connect the throttle simulator to the vehicle. Then, based on a pre-calibrated mapping relationship between signal parameters and throttle opening, they can determine the signal parameters corresponding to each specific throttle opening. Then, they can input the signal parameters corresponding to each specific throttle opening through input device 50, and then perform a dynamic performance test at that specific throttle opening. To test the vehicle's dynamic performance at other specific throttle openings, they can simply modify the input signal parameters accordingly (e.g., adjust the signal duty cycle).

[0058] Furthermore, the input device 50 is also communicatively connected to the data reading interface of the onboard automatic diagnostic system. For example, the input device 50 is communicatively connected to the data reading interface of the onboard automatic diagnostic system via the aforementioned CAN box. The input device 50 is also used to obtain the target throttle opening feedback from the vehicle controller through this data reading interface. Furthermore, the input device 50 can also display the target throttle opening feedback from the vehicle controller. The tester can further compare the feedback target throttle opening with the set throttle opening. If the target throttle opening feedback from the vehicle controller is inconsistent with the set throttle opening, the input signal parameters are further adjusted to achieve closed-loop control, thereby further ensuring the accuracy and stability of the throttle opening simulation.

[0059] Optionally, the throttle simulation device may further include an anti-backflow circuit, the first end of the anti-backflow circuit is connected to the voltage output end of the second power supply circuit 40, and the second end of the anti-backflow circuit is connected to the power supply end of the drive circuit 32. The anti-backflow circuit is used to prevent the large current in the drive circuit 32 from flowing back into the second power supply circuit 40.

[0060] Please refer again Figure 3 The anti-backflow circuit includes a second diode 61 and a third diode 62. The anodes of the second diode 61 and the third diode 62 are both connected to the voltage output terminal of the second power supply circuit 40, the cathode of the second diode 61 is connected to the power supply terminal of the first driving sub-circuit 321, and the cathode of the third diode 62 is connected to the power supply terminal of the second driving sub-circuit 322.

[0061] Optionally, the throttle simulation device may further include a coupling capacitor (not shown in the figure), one end of the coupling capacitor is connected to the power supply end of the drive circuit 32, and the other end of the coupling capacitor is connected to one end of the inductor 31d in the step-down circuit 31.

[0062] Exemplarily, the throttle simulation device includes two coupling capacitors, namely a first coupling capacitor and a second coupling capacitor. A first end of the first coupling capacitor is connected to the power supply terminal of the first driver sub-circuit 321, and a second end of the first coupling capacitor is connected to the first end of the inductor 31d in the first step-down sub-circuit 311 (i.e., the end connected to the source electrode of the first switching transistor 31b). The first coupling capacitor is used to isolate the first driver sub-circuit 321 from the first step-down sub-circuit 311, thereby preventing coupling interference between the first driver sub-circuit 321 and the first step-down sub-circuit 311. A first end of the second coupling capacitor is connected to the power supply terminal of the second driver sub-circuit 322, and a second end of the second coupling capacitor is connected to the first end of the inductor 31d in the second step-down sub-circuit 312. The second coupling capacitor is used to isolate the second driver sub-circuit 322 from the second step-down sub-circuit 312, thereby preventing coupling interference between the second driver sub-circuit 322 and the second step-down sub-circuit 312.

[0063] When testing the dynamic performance of a vehicle, the tester can simulate different throttle openings through the throttle simulation device in this embodiment, thereby performing dynamic performance tests at different throttle openings without actually stepping on the accelerator pedal, thereby improving the accuracy and efficiency of the test.

[0064] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A throttle simulation device, characterized in that: The throttle simulation device comprises: a signal generating circuit, configured to generate a target pulse width modulation signal; a first power supply circuit; A voltage conversion circuit is connected to the signal output end of the signal generating circuit and the voltage output end of the first power supply circuit, and is used to convert the power supply voltage output by the first power supply circuit into a target voltage signal using the target pulse width modulation signal; wherein the voltage magnitude of the target voltage signal represents the magnitude of the throttle opening.

2. The throttle simulation device according to claim 1, characterized in that: The voltage conversion circuit includes a step-down circuit, a voltage input end of the step-down circuit is connected to the voltage output end of the first power supply circuit, a signal input end of the step-down circuit is connected to the signal output end of the signal generating circuit, and a voltage output end of the step-down circuit is used to output the target voltage signal.

3. The throttle simulation device according to claim 2, characterized in that: The voltage conversion circuit also includes a drive circuit, and the throttle simulation device also includes a second power supply circuit. The power supply end of the drive circuit is connected to the voltage output end of the second power supply circuit, the signal input end of the drive circuit is connected to the signal output end of the signal generating circuit, and the signal output end of the drive circuit is connected to the signal input end of the step-down circuit.

4. The throttle simulation device according to claim 3, characterized in that: The target pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, the signal generation circuit includes a first signal output terminal for outputting the first pulse width modulation signal and a second signal output terminal for outputting the second pulse width modulation signal; the first power supply circuit includes a first power supply for outputting a first power supply voltage and a second power supply for outputting a second power supply voltage; the driving circuit includes a first driving sub-circuit and a second driving sub-circuit; the step-down circuit includes a first step-down sub-circuit and a second step-down sub-circuit, and the target voltage signal includes a first voltage signal and a second voltage signal; Among them, the signal input end of the first driving sub-circuit is connected to the first signal output end of the signal generating circuit, the signal output end of the first driving sub-circuit is connected to the signal input end of the first step-down sub-circuit, the voltage input end of the first step-down sub-circuit is connected to the voltage output end of the first power supply, and the voltage output end of the first step-down sub-circuit is used to output the first voltage signal; the signal input end of the second driving sub-circuit is connected to the second signal output end of the signal generating circuit, the signal output end of the second driving sub-circuit is connected to the signal input end of the second step-down sub-circuit, the voltage input end of the second step-down sub-circuit is connected to the voltage output end of the second power supply, and the voltage output end of the second step-down sub-circuit is used to output the second voltage signal; the power supply end of the first driving sub-circuit and the power supply end of the second driving sub-circuit are both connected to the voltage output end of the second power supply circuit.

5. The throttle simulation device according to claim 4, characterized in that: The target step-down sub-circuit includes a first voltage stabilizing unit, a first switching tube, a first diode, an inductor, and a second voltage stabilizing unit. The target step-down sub-circuit is any one of the first step-down sub-circuit and the second step-down sub-circuit. The first end of the first voltage stabilizing unit is connected to the first end of the first switching tube, the second end of the first switching tube is connected to the cathode of the first diode and the first end of the inductor, the second end of the inductor is connected to the first end of the second voltage stabilizing unit, the second end of the first voltage stabilizing unit, the anode of the first diode, and the second end of the second voltage stabilizing unit are all connected to the ground end, the first end of the first voltage stabilizing unit is the voltage input end of the target buck sub-circuit, the first end of the second voltage stabilizing unit is the voltage output end of the target buck sub-circuit, and the controlled end of the first switching tube is the signal input end of the target buck sub-circuit.

6. The throttle simulation device according to claim 4, characterized in that: The target driving sub-circuit includes a second switching tube and a third switching tube, and the target driving sub-circuit is any one of the first driving sub-circuit and the second driving sub-circuit; The first end of the second switch tube is connected to the voltage output end of the second power supply circuit, the second end of the second switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, the controlled end of the second switch tube is connected to the controlled end of the third switch tube, the controlled end of the second switch tube is the signal input end of the target drive sub-circuit, and the second end of the second switch tube is the signal output end of the target drive sub-circuit.

7. The throttle simulation device according to claim 3, characterized in that: The throttle simulation device further includes an anti-backflow circuit, a first end of the anti-backflow circuit being connected to the voltage output end of the second power supply circuit, a second end of the anti-backflow circuit being connected to the power supply end of the drive circuit, and the anti-backflow circuit being used to prevent a large current in the drive circuit from flowing back into the second power supply circuit; And / or, the throttle simulation device further includes a coupling capacitor, one end of the coupling capacitor is connected to the power supply end of the drive circuit, and the other end of the coupling capacitor is connected to one end of the inductor in the step-down circuit.

8. The throttle simulation device according to claim 1, characterized in that: The signal output end of the voltage conversion circuit is used to connect to the vehicle controller, and the vehicle controller is used to determine the target throttle opening corresponding to the target voltage signal and generate a control instruction corresponding to the target throttle opening; wherein, the control instruction is used to control the power output of the vehicle.

9. The throttle simulation device according to claim 1, characterized in that: The throttle simulation device also includes an input device connected to the signal generating circuit, the input device is used to obtain signal parameters input by the tester and send the signal parameters to the signal generating circuit, and the signal generating circuit is used to generate the target pulse width modulation signal after receiving the signal parameters; wherein, the signal parameters include signal frequency and signal duty cycle.

10. The throttle simulation device according to claim 9, characterized in that: The input device is also in communication connection with a data reading interface of an on-board automatic diagnostic system, and the input device is further used to obtain a target throttle opening feedbacked by a vehicle controller through the data reading interface.

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