Intelligent polarity reversal wiring method and wiring clamp for engine emergency ignition

Abstract

The present invention discloses an intelligent polarity reversal wiring method and a wiring clamp for emergency ignition of an engine, which are applied to an emergency starting power supply, and the emergency starting power supply at least includes an engine battery, a DC power supply, and a wiring clamp arranged between the engine battery and the DC power supply. When the engine battery is under an undervoltage emergency starting operation condition, the wiring clamp starts a polarity reversal detection of the wiring terminal; the reversal detection includes the steps of: the wiring clamp measures Vbus and Vb in an initial state, wherein Vbus is the voltage after rectification of the input voltage at the incoming terminal of the wiring clamp; setting a floating threshold Vth; and performing a reversal detection according to Vbus, Vb, and Vth to determine the ignition mode of the engine battery. The over- and under-voltage protection, non-polarity access at the incoming terminal, and polarity reversal at the outgoing terminal are realized, and the reliability of the DC power supply and the DC load during charging can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of wiring clamps, in particular to an intelligent polarity reversal wiring method for emergency ignition of an engine and a wiring clamp. Background Art

[0002] In recent years, long-term non-starting of car engines has led to battery undervoltage. Therefore, car engine battery undervoltage is an existing common problem. Engine battery undervoltage makes the car unable to start normally, insufficient voltage during ignition, abnormal power disconnection, and damage to the vehicle's electrical equipment.

[0003] At the same time, the common automobile engine ignition devices or wiring clamps currently on the market do not have the automatic flipping function when the polarity of the output terminal is connected incorrectly. They can only provide an alarm and ask the user to reconnect the wires according to the correct polarity. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an intelligent polarity reversal wiring method and wiring clamp for emergency ignition of an engine, so as to solve the problems raised by the above-mentioned background technology.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an intelligent polarity reversal wiring method for emergency ignition of an engine, which is applied to an emergency starting power supply, the emergency starting power supply at least includes an engine battery, a DC power supply and a wiring clamp arranged between the engine battery and the DC power supply. Under the emergency starting operation condition that the engine battery is under voltage, the wiring clamp starts the polarity reversal detection of the wiring terminal; the reversal detection includes the steps of:

[0006] The wiring clamp measures Vbus and Vb in the initial state, where Vbus is the voltage after rectification of the input voltage at the wiring clamp inlet. Vbus is divided by resistors R1 and R2 and then connected to the MCU pin of the main control chip through resistor R3. The pin is defined as Vb.

[0007] Set the floating threshold Vth to avoid unstable state caused by external interference or sampling accuracy fluctuation;

[0008] Based on Vbus, Vb and Vth, a flip detection is performed to determine the engine battery ignition mode.

[0009] As a further improvement of the present invention: the initial state of the connection clamp is that both the relay K1 and the relay K2 are connected to the contact "1", and the relay K3 is disconnected.

[0010] As a further improvement of the present invention: when Vb>Vbus+Vth, the wiring clamp enters a dual-state delayed ignition mode;

[0011] In this mode, the flip detection indicates that the terminal block is in the third state, where the third state is that both relay K1 and relay K2 are connected to contact "1", and at the same time, relay K3 is open;

[0012] Then, relays K1 and K2 are closed with a time delay and connected to contact "2", and the terminal block enters the fourth state;

[0013] Relay K3 is closed to achieve engine battery ignition.

[0014] As a further improvement of the present invention: when Vb < Vbus - Vth, the terminal block enters the single-state ignition mode;

[0015] In this mode, the flip detection indicates that the terminal block is in the first state, and the first state is the initial state;

[0016] Relay K3 is closed to achieve engine battery ignition.

[0017] As a further improvement of the present invention: when Vb > Vbus - Vth and Vb < Vbus + Vth;

[0018] It is judged whether to enter manual ignition. If so, enter the manual ignition mode, where both relay K1 and relay K2 of the terminal block are connected to contact "1", and relay K3 is closed to achieve engine battery ignition.

[0019] If not, initialize the process.

[0020] As a further improvement of the present invention: relays K1 and K2 are closed and connected to contact "2" with a time delay of 20 ms.

[0021] As a further improvement of the present invention: the floating threshold is 0.1 V.

[0022] An intelligent polarity inversion terminal block for engine emergency ignition, applying an engine emergency ignition intelligent polarity inversion wiring method described in any one of the above, includes an incoming line end and an outgoing line end. The DC power supply is connected to the incoming line end, and the engine battery is connected to the outgoing line end. It further includes a non-polarity access circuit, a DC current sampling circuit, a voltage sampling circuit, a polarity inversion circuit, and a main control chip MCU. The polarity inversion circuit is arranged at the outgoing line end, the non-polarity access circuit is arranged at the incoming line end, the DC current sampling circuit, the voltage sampling circuit, and the polarity inversion circuit are connected to the main control chip, and the DC current sampling circuit is connected to the non-polarity access circuit.

[0023] As a further improvement of the present invention: the polarity reversal circuit is mainly composed of three relays; the "+" end of the output voltage Vbus after rectification at the incoming line end is connected to the normally closed contact "1" of relay K1, and to the normally open contact "2" of K2; the "-" end of Vbus is connected to the normally open contact "2" of relay K1 and the normally closed contact "1" of K2 after passing through current sampling resistors Rs1, Rs2, Rs3, Rs4 and Rs5; the output contact "3" of relay K2 is connected to the contact "1" of relay K3, and the output contact "3" of K3 is connected to the reference contact "b" of the outgoing line end.

[0024] As a further improvement of the present invention: the voltage of the input voltage at the line end after rectification is Vbus, Vbus is divided by resistors R1 and R2 and then connected to the pin of the main control chip MCU through resistor R3, the pin network label is defined as Vb, and capacitor C1 is connected between Vb and the reference ground.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention can realize over-voltage and under-voltage protection, non-polarity access at the input terminal, and polarity reversal at the output terminal, and can improve the reliability of the DC power supply and the DC load during charging. The non-polarity access at the input terminal can facilitate the design of the input terminal interface, and there is no need to do a structural anti-reverse connection design, thereby improving the versatility of the wiring clamp. The polarity reversal function at the output terminal can improve the user's operating experience when charging the DC load, and there is no need to pay attention to the positive and negative polarity of the output terminal wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of polarity reversal wiring ignition of the present invention.

[0028] Figure 2 This is a state summary diagram of the polarity reversal circuit of the present invention.

[0029] Figure 3a Schematic diagram of the non-polarity access circuit of the present invention Figure 1 .

[0030] Figure 3b Schematic diagram of the non-polarity access circuit of the present invention Figure 2 .

[0031] Figure 4 It is a schematic diagram of a DC current sampling circuit of the present invention.

[0032] Figure 5 Schematic diagram of a voltage sampling circuit of the present invention.

[0033] Figure 6 Schematic diagram of the polarity reversal circuit of the present invention. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: An intelligent polarity inversion wiring method for emergency starting of an engine, which is applied to an emergency starting power supply. The emergency starting power supply at least includes an engine battery, a DC power supply, and a wiring clip disposed between the engine battery and the DC power supply. Under the emergency starting operation condition that the engine battery is under-voltage, the wiring clip enables the detection of the polarity inversion of the wiring terminal. The inversion detection includes the following steps:

[0036] The wiring clip measures Vbus and Vb in the initial state, where Vbus is the voltage after rectification of the input voltage at the incoming line end of the wiring clip. Vbus is divided by resistors R1 and R2 and then connected to the pin of the main control chip MCU through resistor R3. The net label of this pin is defined as Vb.

[0037] Set a floating threshold Vth to avoid unstable states caused by external interference or sampling accuracy fluctuations.

[0038] Based on Vbus, Vb, and Vth, perform inversion detection to determine the engine battery ignition mode.

[0039] The initial state of the wiring clip is that both relay K1 and relay K2 are connected to contact "1", and at the same time, relay K3 is disconnected.

[0040] When Vb > Vbus + Vth, the wiring clip enters the dual-state delay ignition mode;

[0041] In this mode, the inversion detection shows that the wiring clip is in the third state. The third state is that both relay K1 and relay K2 are connected to contact "1", and at the same time, relay K3 is disconnected;

[0042] Then relay K1 and relay K2 are delayed to close and connected to contact "2", and the wiring clip enters the fourth state;

[0043] Relay K3 closes to achieve ignition of the engine battery.

[0044] When Vb < Vbus - Vth, the wiring clip enters the single-state ignition mode;

[0045] In this mode, the inversion detection shows that the wiring clip is in the first state. The first state is the initial state;

[0046] Relay K3 closes to achieve engine battery ignition.

[0047] When Vb > Vbus - Vth and Vb < Vbus + Vth;

[0048] Determine whether to enter manual ignition. If so, enter the manual ignition mode. The wiring clip relay K1 and relay K2 are both connected to the contact "1", and relay K3 closes to achieve engine battery ignition.

[0049] If not, initialize the process.

[0050] Relay K1 and relay K2 close and are connected to the contact "2" after a 20ms delay.

[0051] The floating threshold is 0.1V.

[0052] An intelligent polarity-reversing wiring clip for engine emergency ignition applies an engine emergency ignition intelligent polarity-reversing wiring method described in any of the above items, including an inlet end and an outlet end. The DC power supply is connected to the inlet end, and the engine battery is connected to the outlet end. It further includes a non-polar access circuit, a DC current sampling circuit, a voltage sampling circuit, a polarity-reversing circuit, and a main control chip MCU. The polarity-reversing circuit is arranged at the outlet end, the non-polar access circuit is arranged at the inlet end, the DC current sampling circuit, the voltage sampling circuit, and the polarity-reversing circuit are connected to the main control chip, and the DC current sampling circuit is connected to the non-polar access circuit.

[0053] The polarity-reversing circuit is mainly composed of three relays; the "+" end of the rectified output voltage Vbus at the inlet end is connected to the normally closed contact "1" of relay K1 and the normally open contact "2" of relay K2; the "-" end of Vbus is connected to the normally open contact "2" of relay K1 and the normally closed contact "1" of relay K2 after passing through the current sampling resistors Rs1, Rs2, Rs3, Rs4, and Rs5; the output contact "3" of relay K2 is connected to the contact "1" of relay K3, and the outgoing contact "3" of K3 is connected to the contact "b" at the outlet end.

[0054] The voltage after rectifying the input voltage at the inlet end is Vbus. Vbus is divided by resistors R1 and R2 and then connected to the pin of the main control chip MCU through resistor R3. The net label of this pin is defined as Vb, and capacitor C1 is connected between Vb and the reference ground.

[0055] Implementation case:

[0056] To make the drawings of each embodiment clear, the same electrical component symbols are independent of each other, only showing an example of the current circuit drawing, rather than the overall drawing.

[0057] The present invention utilizes an embedded system based on GD32F330F4P6 as a main control chip to realize a series of intelligent functions, including over-voltage and under-voltage protection, overcurrent and short-circuit protection, non-polarity access at the incoming line end, and polarity reversal at the outgoing line end.

[0058] The wiring clamp of the present invention has an inlet terminal and an outlet terminal, wherein the outlet terminal is two clamps with cables for clamping and connecting the positive and negative electrodes of the automobile battery. The inlet terminal is connected to a DC power supply, and the outlet terminal clamps the positive and negative electrodes of the automobile battery.

[0059] according to Figure 2 , the polarity reversal circuit state is summarized into four states: BT is the battery, VBT is the battery wiring voltage.

[0060] 1. Before ignition, determine the connection between the car engine battery and the terminal clamp, and decide whether the flip circuit will work accordingly. There are two connection conditions: 1) The battery "+" is connected to the terminal clamp "a", and the "-" is connected to the terminal clamp "b", then the polarity connection is correct; then the flip circuit will not work. 2) The battery "+" is connected to the terminal clamp "b", and the "-" is connected to the terminal clamp "a", then the polarity connection is wrong, and the flip circuit will work.

[0061] 2. Before ignition, the initial state of the polarity reversal circuit is: relay K1 and relay K2 are both connected to contact "1", and relay K3 is disconnected.

[0062] 3. Before ignition, relays K1 and K2 of the polarity reversal circuit operate synchronously, either at contact "1" or at contact "2".

[0063] 4. Before ignition, relays K1 and K2 of the polarity reversal circuit act synchronously. However, in order to avoid inconsistent actions caused by components or other reasons, if polarity reversal is required, there will be a delay of a period of time (the delay is greater than the relay action time, which is 20ms) after driving relays K1 and K2 to act, and then K3 will be closed for ignition.

[0064] According to 1~4, we can conclude that Figure 2 The four states shown in the upper part include all the states in the working process of the terminal clamp, namely the first state to the fourth state. Each state has the polarity connection between the battery and the terminal clamp and the position of the relay K1 and the relay K2.

[0065] If you cannot accurately judge the polarity of the battery and the terminal clamp connection, you can enter the manual ignition mode through an external switch.

[0066] Figure 2 The block diagram of these four states is simplified in the middle, which is equivalent to the connection relationship between the battery and the DC power supply.

[0067] Figure 2 In the lower part, according to the above connection relationship, the expression of Vb is obtained. It can be seen that the expressions of Vb corresponding to the four states are different. Then, the connection situation between the automotive engine battery and the terminal clamp before ignition can be judged according to the value of Vb, and the polarity is reversed when the wiring is incorrect, and then ignition is carried out.

[0068] According to Figure 1 : First, power on the terminal clamp for initialization. At this time, both relay K1 and relay K2 are connected to contact "1", relay K3 is disconnected, and Vbus and Vb are measured.

[0069] Vth is a floating threshold value. Introducing this value can avoid the state instability caused by external interference or sampling accuracy fluctuations in actual applications. The floating threshold value is 0.1V.

[0070] If Vb < Vbus - Vth, it enters the first state, then relay K3 closes for ignition, and it ends;

[0071] If Vb > Vbus + Vth, it enters the third state, then both relay K1 and relay K2 are switched to contact "2" to achieve polarity reversal, enters the fourth state, then relay K3 closes for ignition, and it ends;

[0072] If Vb > Vbus - Vth and Vb < Vbus + Vth, the state cannot be accurately judged. If the manual button is pressed, it enters the manual ignition mode, otherwise it returns to the initialization process.

[0073] (1) Non-polar access circuit:

[0074] According to Figure 3a and Figure 3b

[0075] Circuit description: Two power lines of the external DC power supply are respectively connected to the incoming line terminals, and then respectively connected to the connection points of diode D2, diode D4 and diode D3, diode D5. Then, the rectified positive pole is led out from the common cathode connection point of diode D2 and diode D3, and the rectified negative pole is led out from the common anode connection point of diode D4 and diode D5. The rectified negative pole is used as the reference ground of the entire terminal clamp, and the rectified output voltage is defined as Vbus.

[0076] Circuit explanation: There are two cases for the polarity of the incoming line terminals, as shown in Figure 3a , Figure 3b shown.

[0077] When as shown in Figure 3aWhen the polarity is shown, the current flows in from the input terminal "+", then enters from the anode of diode D2 and exits from the cathode, connects to the Vbus post-stage load (car engine, wiring clamp, etc.) back to the anode of diode D5, and flows from the cathode of diode D5 back to the input terminal "-".

[0078] When Figure 3b When the polarity is shown, the current flows in from the input terminal "+", then enters from the anode of diode D3 and exits from the cathode, connects to the Vbus post-stage load (car engine, wiring clamp, etc.) back to the anode of diode D4, and flows from the cathode of diode D4 back to the input terminal "-".

[0079] regardless Figure 3a still Figure 3b As shown in the connection polarity, the positive electrodes after rectification are all the common cathode connection point of the diode D2 and the diode D3, and the negative electrodes after rectification are all the common anode connection point of the diode D4 and the diode D5.

[0080] (II) DC current sampling circuit

[0081] according to Figure 4

[0082] Circuit description: The current Ia output from the DC power supply passes through five parallel sampling resistors Rs1~Rs5 to generate a sampling signal VinI as the input signal of the operational amplifier OP. Resistor R3 is connected between the "+" input terminal and the reference ground of the operational amplifier OP, resistor R4 is connected between the "-" input terminal and the reference ground of the operational amplifier OP, resistor R5 is connected between the "-" input terminal and the output of the operational amplifier OP, and the output terminal of the operational amplifier is defined as VoI.

[0083] Resistor R6 is connected in series between VoI and the MCU pin of the main control chip. The pin is defined as Isample on the net label. Capacitor C1 is connected between Isample and the reference ground. The anode of diode D1 is connected to Isample, and the cathode is connected to the reference ground.

[0084] Resistor R7 is connected in series between VoI and the MCU pin of the main control chip, which is defined as Ioc on the net mark. Capacitor C2 is connected between Ioc and the reference ground. The anode of diode D2 is connected to Ioc, and the cathode is connected to the reference ground.

[0085] Circuit explanation: The maximum voltage of the sampling port of the main control chip MCU is 3.3V. A margin of about 10% is usually left during design. Then the maximum sampling signal voltage Isample and Ioc entering the main control chip MCU can be close to but not exceed 3V, but they cannot be too small, otherwise sampling distortion will occur.

[0086] When the car engine is ignited, the instantaneous high current can reach 600A, so the power of the sampling resistor needs to be considered. In addition, the waveform of the car engine ignition current is an irregular spike pulse wave. For this type of spike pulse wave, 0.2*I*I*R is usually used to estimate the power of the sampling resistor. If N sampling resistors with a rated power of 3W are selected in parallel for sampling, the power equation generated on the resistor when the rated nominal power of the sampling resistor is greater than or equal to the ignition current is listed, and there is: 3*N ≥ 0.2*I*I*R. According to I=600A, R=0.2mΩ can be obtained, and N=5 can meet the requirements. So 5 1 mΩ resistors are connected in parallel to get just 0.2mΩ.

[0087] Then calculate the sampling voltage VinI=600A*0.2 mΩ=0.12V obtained on the sampling resistor. It has been explained above that the maximum sampling signal entering the main control chip MCU is close to 3V, and at this time 600A is already the maximum ignition current. Then VinI needs to be amplified by 3V / 0.12V=25 times. According to the basic principle of operational amplifier OP, the resistor R4=10k and the resistor R5=240k just make the amplification factor 25 times. After VinI is amplified 25 times, VoI is obtained, and then it is sampled by two RC filters with different filtering time constants. The output signal of the larger filtering time constant is Isample, which is used for overcurrent analysis. The output signal of the smaller filtering time constant is Ioc, which is used for short circuit judgment. Before these two sampling signals enter the main control chip MCU, they are also clamped by diodes so that the sampling signal does not exceed 3.3V+VF, thereby protecting the ADC sampling port of the MCU main control chip from being damaged by external sudden large voltage.

[0088] (III) Voltage sampling circuit

[0089] According to the attached Figure 5

[0090] The sampling of the DC power supply at the incoming line end is taken as an example for explanation. The sampling of the Va and Vb voltages at the outgoing line end is similar.

[0091] Circuit description: The voltage of the input voltage at the line end after rectification is Vbus. Vbus is divided by resistors R1 and R2 and then connected to the MCU pin of the main control chip through R3. The pin is defined as Vb. Capacitor C1 is connected between Vb and the reference ground.

[0092] Circuit explanation: The maximum nominal voltage of Vbus is +24V. According to the 10% margin calculation, the maximum input voltage = 24V + 0.1 * 24V = 26.4V

[0093] The maximum sampling signal voltage Vb entering the main control chip can be close to but not more than 3V, but it cannot be too small, otherwise sampling distortion will occur; let the resistor R1=8.2k, the resistor R2=1k, then Vb1=2.87V, which meets the requirements; the post-stage uses the RC filter circuit to filter the signal and generate the sampling signal Vb that enters the main control chip MCU.

[0094] (IV) Polarity reversal circuit

[0095] According to the attached Figure 6

[0096] It is mainly composed of three relays. The "+" end of the output voltage Vbus after rectification at the incoming line is connected to the normally closed contact "1" of relay K1 and the normally open contact "2" of K2; the "-" end of Vbus is connected to the normally open contact "2" of relay K1 and the normally closed contact "1" of K2 after passing through the current sampling resistors Rs1~Rs5. The output contact "3" of relay K2 is connected to the contact "1" of relay K3, and the output contact "3" of K3 is connected to the reference contact "b" of the outgoing line.

[0097] Relay K3 driving circuit: The driving signal K3-DRV sent by the MCU main control chip is connected to one end of R1, and then connected to the base of the PNP transistor Q1 from the other end of R1, and C1 and R2 are connected between the base of Q1 and the reference ground; the emitter of the transistor Q1 is connected to +5V and connected to one end of the driving coil of the relay K3, and the other end of the driving coil is connected to the reference ground; the freewheeling diode D1 is connected in parallel at both ends of the K3 driving coil, with the anode connected to the reference ground and the cathode connected to the collector of Q1.

[0098] Relay K2 drive circuit: The drive signal K2-DRV sent by the MCU main control chip is connected to one end of R3, and then connected to the base of the PNP transistor Q2 from the other end of R3, and C2 and R4 are connected between the base of Q2 and the reference ground; the emitter of the transistor Q2 is connected to +5V and connected to one end of the drive coil of the relay K2, and the other end of the drive coil is connected to the reference ground; the freewheeling diode D2 is connected in parallel at both ends of the K2 drive coil, with the anode connected to the reference ground and the cathode connected to the collector of Q2.

[0099] Relay K1 drive circuit: The drive signal K1-DRV sent by the MCU main control chip is connected to one end of R5, and then connected to the base of the PNP transistor Q3 from the other end of R5, and C3 and R6 are connected between the base of Q3 and the reference ground; the emitter of the transistor Q3 is connected to +5V and connected to one end of the drive coil of the relay K1, and the other end of the drive coil is connected to the reference ground; the freewheeling diode D3 is connected in parallel at both ends of the K2 drive coil, with the anode connected to the reference ground and the cathode connected to the collector of Q3.

[0100] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. An intelligent polarity reversal wiring method for emergency engine ignition, applied to an emergency starting power supply, the emergency starting power supply at least comprising an engine battery, a DC power supply and a wiring clamp arranged between the engine battery and the DC power supply, characterized in that: Under the emergency start operation condition that the engine battery is under-voltage, the wiring clamp turns on the polarity inversion detection of the connection terminal; the inversion detection includes the steps: The wiring clamp measures Vbus and Vb in the initial state, where Vbus is the voltage after rectifying the input voltage at the incoming line end of the wiring clamp. Vbus is divided by resistors R1 and R2 and then connected to the pin of the main control chip MCU through resistor R3. The net label of this pin is defined as Vb; Set the floating threshold Vth to avoid unstable states caused by external interference or sampling accuracy fluctuations; According to Vbus, Vb and Vth, perform inversion detection to determine the engine battery ignition mode; The initial state of the wiring clamp is that both relay K1 and relay K2 are connected to contact "1", and at the same time relay K3 is disconnected; The "+" end of the rectified output voltage Vbus at the incoming line end is connected to the normally closed contact "1" of relay K1 and the normally open contact "2" of relay K2; the "-" end of Vbus is connected to the normally open contact "2" of relay K1 and the normally closed contact "1" of relay K2 after passing through current sampling resistors Rs1, Rs2, Rs3, Rs4 and Rs5; the output contact "3" of relay K2 is connected to contact "1" of relay K3, and the outgoing contact "3" of K3 is connected to the outgoing line end contact "b".

2. The method for intelligent polarity reversal wiring for emergency ignition of an engine according to claim 1, characterized in that: When Vb > Vbus + Vth, the wiring clamp enters the dual-state delay ignition mode; In this mode, the inversion detection is that the wiring clamp is in the third state, and the third state is that both relay K1 and relay K2 are connected to contact "1", and at the same time relay K3 is disconnected; Then relay K1 and relay K2 are delayed to close and connected to contact "2", and the wiring clamp enters the fourth state; Relay K3 closes to achieve engine battery ignition.

3. The method for intelligent polarity reversal wiring for emergency ignition of an engine according to claim 2, characterized in that: When Vb < Vbus - Vth, the wiring clamp enters the single-state ignition mode; In this mode, the inversion detection is that the wiring clamp is in the first state, and the first state is the initial state; Relay K3 closes to achieve engine battery ignition.

4. The method for intelligent polarity reversal wiring for emergency ignition of an engine according to claim 3, characterized in that: When Vb > Vbus - Vth and Vb < Vbus + Vth; Judge whether to enter manual ignition. If so, enter the manual ignition mode. Both relay K1 and relay K2 of the wiring clamp are connected to contact "1", and relay K3 closes to achieve engine battery ignition; If not, initialize the process.

5. The method for intelligent polarity reversal wiring for emergency ignition of an engine according to claim 2, characterized in that: Relay K1 and relay K2 are delayed to close and connected to contact "2" for 20 ms.

6. The method for intelligent polarity reversal wiring for emergency ignition of an engine according to claim 4, characterized in that: The floating threshold is 0.1V.

7. An engine emergency ignition intelligent polarity reversal wiring clamp, using an engine emergency ignition intelligent polarity reversal wiring method as claimed in any one of claims 1 to 6, characterized in that: It includes an incoming line end and an outgoing line end. The DC power supply is connected to the incoming line end, and the engine battery is connected to the outgoing line end. It also includes a non-polarity access circuit, a DC current sampling circuit, a voltage sampling circuit, a polarity inversion circuit and a main control chip MCU. The polarity inversion circuit is arranged at the outgoing line end, the non-polarity access circuit is arranged at the incoming line end, the DC current sampling circuit, the voltage sampling circuit and the polarity inversion circuit are connected to the main control chip, and the DC current sampling circuit is connected to the non-polarity access circuit.

8. The intelligent polarity reversal wiring clamp for emergency engine ignition according to claim 7, characterized in that: The polarity reversal circuit is composed of three relays; the "+" end of the output voltage Vbus after rectification at the incoming line end is connected to the normally closed contact "1" of relay K1 and the normally open contact "2" of K2; the "-" end of Vbus is connected to the normally open contact "2" of relay K1 and the normally closed contact "1" of K2 after passing through current sampling resistors Rs1, Rs2, Rs3, Rs4 and Rs5; the output contact "3" of relay K2 is connected to the contact "1" of relay K3, and the output contact "3" of K3 is connected to the reference contact "b" of the outgoing line end.

9. The intelligent polarity reversal wiring clamp for emergency engine ignition according to claim 7, characterized in that: The voltage of the input voltage at the incoming line end after rectification is Vbus. After being divided by resistors R1 and R2, Vbus is connected to the MCU pin of the main control chip through resistor R3. The pin is defined as Vb on the network label. Capacitor C1 is connected between Vb and the reference ground.

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