Accelerator disconnection detection anti-galloping circuit

Abstract

The utility model belongs to the technical field of accelerator broken line detection, and particularly relates to an accelerator broken line detection anti-galloping circuit which comprises a signal voltage detection and filter circuit, a voltage following circuit and a clamping circuit. The voltage detection and filter circuit comprises a resistor R1, a resistor R2, a resistor R4 and a capacitor C1, the voltage follower circuit comprises an operational amplifier U1 and a resistor R3, and the clamping circuit comprises a diode D1. Through the cooperation of the signal voltage detection and filter circuit, the voltage following circuit and the clamping circuit, the accelerator broken line detection anti-galloping circuit does not respond to vehicle galloping caused by abnormal level signals when an accelerator ground wire is broken, the broken line of the accelerator can be judged, the accelerator broken line detection function is added, and the safety of the accelerator is improved. The risk of galloping of the vehicle can be prevented; and the accelerator fault can be quickly positioned and is alarmed and processed by the controller, so that maintenance personnel can quickly process the accelerator fault conveniently.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the throttle wire break detection technical field, specifically relates to a kind of throttle wire break detection anti-flying car circuit. BACKGROUND

[0002] Most of the electronic throttle for electric vehicle is hall throttle as vehicle speed control device, usually the hall element of hall throttle is directly connected to controller, and the controller supplies power and detects output signal to control vehicle speed and realize various functions;The voltage of general electronic throttle is 5V, and its output signal range is about 1-4.5V;

[0003] The electronic throttle power supply circuit in prior art controller is as shown in Figure 1 5V voltage is provided to the throttle by the controller, and the output voltage of the throttle is input to the positive input terminal of operational amplifier U1 after being divided by R1 and R2, and the output of U1 is sent to MCU for operation and detection through R3;When the ground wire of electronic throttle is broken, the signal line output of throttle will be pulled up, and the controller will misjudge the signal effective, resulting in vehicle running (flying phenomenon);When the power supply or signal line of electronic throttle is broken, the output of throttle signal line is always at zero voltage, and even if the throttle is operated, there is no effective level input to the controller, and the controller cannot distinguish between the throttle power supply or signal line break and throttle inaction, so the fault position cannot be accurately located. CONTENT OF THE UTILITY MODEL

[0004] To solve the above problems in the prior art, the utility model provides a kind of throttle wire break detection anti-flying car circuit, with the characteristics that vehicle running caused by signal misjudgment when throttle ground wire is broken can be avoided, and throttle power supply or signal line break can be judged and alarm processing by controller to quickly locate throttle fault.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of throttle wire break detection anti-flying car circuit, including signal voltage detection and filter circuit, voltage follower circuit and clamping circuit;Signal voltage detection and filter circuit includes resistance R1, resistance R2, resistance R4 and capacitor C1, voltage follower circuit includes operational amplifier U1 and resistance R3, and clamping circuit includes diode D1;Wherein one end of resistance R1 is connected to throttle output, the other end of resistance R1 is connected to the positive input terminal of operational amplifier U1, one end of resistance R4 is connected to throttle output, and the other end is connected to 15V power supply, one end of resistance R2 is connected to the positive input terminal of operational amplifier U1, and the other end is grounded, and capacitor C1 is connected in parallel to resistance R2;The positive input terminal of operational amplifier U1 receives throttle signal, the reverse input terminal is connected to the output terminal, one end of the output terminal of operational amplifier U1 is connected to resistance R3, and the other end of resistance R3 is connected to MCU;The anode of diode D1 is connected to MCU signal input pin, and the cathode is connected to 3V3 power supply.

[0006] As one kind of accelerator broken line detection anti-flying car circuit preferred technical scheme of the utility model, accelerator output voltage is divided by resistance R1 and resistance R2 and is sent into the positive input end of operational amplifier U1, accelerator signal is followed by operational amplifier U1 output, and then is inputted to MCU through resistance R3 for detection processing.

[0007] As one kind of accelerator broken line detection anti-flying car circuit preferred technical scheme of the utility model, accelerator signal line is disconnected, and the input MCU voltage is the voltage of resistance R4 and the voltage of resistance R1 and resistance R2, and the software judges the voltage out of range alarm.

[0008] As one kind of accelerator broken line detection anti-flying car circuit preferred technical scheme of the utility model, accelerator power line is disconnected, and the Hall type accelerator is not powered and is in high resistance state, and the accelerator value input is followed by the voltage of resistance R4 and the voltage of resistance R1 and resistance R2, and is higher than the normal working range of accelerator output signal, and in the case of accelerator broken line, the MCU can detect that the accelerator opening signal is higher than the full value of accelerator, so that the accelerator fault is judged and alarm is given.

[0009] Compared with the prior art, the utility model has the beneficial effects that: in use, through the cooperation of signal voltage detection and filter circuit, voltage follower circuit and clamping circuit, the accelerator broken line detection anti-flying car circuit of the utility model will not cause the vehicle to fly in response to the abnormal level signal when the accelerator ground wire is disconnected, and the accelerator broken line can be judged, the accelerator broken line detection function is increased, and the danger of vehicle flying can be prevented.

[0010] And the accelerator fault can be quickly located and alarm processing is given by the controller, so that maintenance personnel can quickly handle. DRAWINGS

[0011] The drawings are used to provide further understanding of the utility model, and constitute part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute limitation to the utility model. In the drawings:

[0012] Figure 1 It is existing technology accelerator sampling circuit schematic diagram;

[0013] Figure 2 It is the accelerator detection circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of the utility model protection. Embodiments

[0015] The utility model provides the following technical scheme: a kind of accelerator wire break detection anti-flying car circuit as shown in Figure 2 It includes signal voltage detection and filter circuit, voltage follower circuit and clamping circuit;In this embodiment scheme:

[0016] Signal voltage detection and filter circuit include resistance R1, resistance R2, resistance R4 and capacitor C1;

[0017] Voltage follower circuit includes operational amplifier U1 and resistance R3;

[0018] Clamping circuit includes diode D1.

[0019] Wherein the accelerator output connects one end of resistance R1, the other end of resistance R1 is connected to the positive input end of operational amplifier U1, one end of resistance R4 is connected to accelerator output, and the other end is connected to 15V power supply, one end of resistance R2 is connected to the positive input end of operational amplifier U1, and the other end is connected to ground, and capacitor C1 is connected in parallel to resistance R2;

[0020] The positive input end of operational amplifier U1 receives accelerator signal, and the reverse input end is connected to the output end, one end of resistance R3 is connected to the output end of operational amplifier U1, and the other end of resistance R3 is connected to MCU;

[0021] The anode of diode D1 is connected to MCU signal input pin, and the cathode is connected to 3V3 power supply.

[0022] 15V, 5V and 3V3 are system power supply;

[0023] When accelerator is operated, accelerator output voltage is divided by resistance R1 and resistance R2 and sent to the positive input end of operational amplifier U1, accelerator signal is followed by operational amplifier U1 and output, and then input MCU for detection and processing by resistance R3;

[0024] When accelerator signal line is disconnected, the input voltage of MCU is the voltage of resistance R4 and the voltage of resistance R1 and resistance R2 (set to be higher than the full value voltage of accelerator), and the software judges that the voltage is out of range and alarms;

[0025] When accelerator ground wire is disconnected, the accelerator output voltage will be raised due to the connection of resistance R4 to 15V and exceed the full value of accelerator (the accelerator output voltage is low impedance during normal operation, and will not be affected by pull-up resistance R4).

[0026] When the accelerator power supply line is disconnected, the Hall type accelerator has no power supply in a high resistance state, and the accelerator value input follows the voltage division value of the resistor R4, the resistor R1 and the resistor R2, which is higher than the normal working range of the accelerator output signal, so in the case of accelerator disconnection (the circuit of the utility model is compared with the prior art circuit of Figure 1 The accelerator disconnection detection function is added, and the danger of vehicle flying is prevented, the MCU can detect that the accelerator opening signal is higher than the accelerator full value, so that the accelerator failure is judged and an alarm is given, and maintenance personnel can quickly handle.

[0027] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and not for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A runaway prevention circuit for detecting a throttle cable break, characterized by comprising: The signal voltage detection and filtering circuit, the voltage follower circuit and the clamping circuit are included. The signal voltage detection and filtering circuit includes resistance R1, resistance R2, resistance R4 and capacitor C1, the voltage follower circuit includes operational amplifier U1 and resistance R3, and the clamping circuit includes diode D1. The throttle output is connected to one end of resistance R1, the other end of resistance R1 is connected to the positive input end of operational amplifier U1, one end of resistance R4 is connected to the throttle output, and the other end is connected to a 15V power supply, one end of resistance R2 is connected to the positive input end of operational amplifier U1, and the other end is connected to the ground, and capacitor C1 is connected in parallel to resistance R2; the positive input end of operational amplifier U1 receives the throttle signal, the reverse input end is connected to the output end, one end of resistance R3 is connected to the output end of operational amplifier U1, and the other end is connected to MCU; the anode of diode D1 is connected to the signal input pin of MCU, and the cathode is connected to a 3V3 power supply.

2. The anti-wheelie circuit of claim 1, wherein: The throttle output voltage is divided by resistance R1 and resistance R2 and sent to the positive input end of operational amplifier U1, the throttle signal is followed by the output of operational amplifier U1, and then input to MCU for detection and processing through resistance R3.

3. The anti-wheelie circuit of claim 1, wherein: When the throttle signal line is disconnected, the input voltage of MCU is the voltage of resistance R4 and the voltage of resistance R1 and resistance R2, and the software judges the alarm when the voltage exceeds the range.

4. The anti-wheelie circuit of claim 1, wherein: When the throttle power line is disconnected, the Hall throttle is in a high resistance state without power supply, the throttle value input is followed by the voltage of resistance R4 and the voltage of resistance R1 and resistance R2, which is higher than the normal working range of the throttle output signal, and the MCU can detect that the throttle opening signal is higher than the full throttle value in the case of throttle disconnection, so as to judge the throttle fault and alarm.

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