Electric control system based on automobile intelligent chassis and circuit control system thereof

Abstract

The invention relates to a solenoid valve fault diagnosis technology, and discloses an electric control system based on an automobile intelligent chassis and a circuit control system thereof, and the circuit control system comprises the following steps: setting the state of a control end: setting the state of the control end according to an electric control MCU (Microprogrammed Control Unit) of a commercial vehicle; determining a diagnosis mode: setting the state of the control end and the state of the high-side switch unit so as to determine the diagnosis mode; and determining the electromagnetic valve state of the electromagnetic valve unit, determining the diagnosis mode, and determining the electromagnetic valve state of the electromagnetic valve unit according to the logic level of the FB end. The circuit control system designed by the invention is used for diagnosing the electromagnetic valve of the automobile intelligent chassis, the diagnosis mode is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technology of solenoid valve fault diagnosis, and particularly to an electronic control system and its circuit control system based on an intelligent automotive chassis. Background Art

[0002] The electronic control dryer assembly with an ECU controller has a protection function, which greatly improves the service life of the dryer. An unloading solenoid valve and a backwashing solenoid valve are provided inside the electronic control dryer body. Electrical faults may occur in the solenoid valve during use, thus affecting the realization of the functions of the electronic control dryer.

[0003] Such as the prior art 1: CN201610740760.5, an electronic control dryer assembly with an ECU controller and a control method.

[0004] Such as the prior art 2: CN105549578B, a patent for invention with a publication date of January 30, 2018, discloses a fault diagnosis and response circuit for vehicle solenoid valves and its usage method, which includes a CPU, a solenoid valve, a logic operation processing circuit, an integrated chip, and a display device. The logic operation processing circuit includes a NAND gate chip, a NOR gate chip, and a comparator.

[0005] In view of the prior art, its circuit is complex, the cost is high, and it can only judge that there is a fault in the solenoid valve, but cannot judge which specific fault it is. It is necessary to drive the solenoid valve through the integrated chip BTS7236W to find that there is a fault, that is, it is necessary for the solenoid valve to work to find that there is a fault. However, in the electronic control APU, the solenoid valve does not work most of the time, and the timeliness of the prior art solution is poor.

[0006] The diagnosis of each solenoid valve requires 4 port resources, an information output port, a main control signal output port, a secondary control signal output port, and a voltage input port. The diagnosis of two solenoid valves requires 8 port resources. The electronic control APU (AIR PROCESSING UNIT) adds the management of different air circuits on the basis of the electronic control dryer to achieve more accurate and efficient air processing, and the demand for port resources increases a lot. Summary of the Invention

[0007] Aiming at the problems of complex diagnosis operation and high cost of the solenoid valve on the intelligent automotive chassis in the prior art, the present invention provides an electronic control system and its circuit control system based on an intelligent automotive chassis.

[0008] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0009] A circuit control system based on an intelligent vehicle chassis, which includes a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and a commercial vehicle electronic control MCU; the output end of the solenoid valve unit is electrically connected to the fault diagnosis circuit unit, and the fault diagnosis unit is connected to the IN end of the commercial vehicle electronic control MCU through the high-side switch unit; the fault diagnosis circuit unit is connected to the control end and the FB end of the commercial vehicle electronic control MCU;

[0010] Determination of the high-side switch unit state, determining the state of the high-side switch unit according to the logic level of the IN end;

[0011] Setting of the control end state, setting the state of the control end according to the commercial vehicle electronic control MCU;

[0012] Determination of the diagnostic mode, setting the state of the control end and the high-side switch unit, thereby determining the diagnostic mode;

[0013] Determination of the solenoid valve state of the solenoid valve unit, determining the diagnostic mode, and determining the solenoid valve state of the solenoid valve unit according to the logic level of the FB end.

[0014] Preferably, the solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit, and the first solenoid valve unit is connected to the first fault diagnosis circuit unit, and the second solenoid valve unit is connected to the second fault diagnosis circuit unit. Preferably, the first fault diagnosis circuit unit includes a triode Q1; a resistor R1B is connected to the first end of the triode Q1, a resistor R1A and a resistor R1C are connected to the second end of the triode Q1, and the third end of the triode Q1 is grounded; the other end of the resistor R1B is connected to the Contr1 end of the commercial vehicle electronic control MCU; the other end of the resistor R1A is connected to a 24V voltage, the other end of the resistor R1C is connected to a resistor R1D and is connected to the OUT1 end of the first solenoid valve unit; the other end of the resistor R1D is connected to the FB1 end of the commercial vehicle electronic control MCU, and a capacitor C1, and the other end of the capacitor C1 is grounded;

[0015] The second fault diagnosis circuit unit includes a triode Q2; a resistor R2B is connected to the first end of the triode Q2, a resistor R2A and a resistor R2C are connected to the second end of the triode Q2, and the third end of the triode Q2 is grounded; the other end of the resistor R2B is connected to the Contr2 end of the commercial vehicle electronic control MCU; the other end of the resistor R2A is connected to a 24V voltage, the other end of the resistor R2C is connected to a resistor R2D and is connected to the OUT2 end of the first solenoid valve unit; the other end of the resistor R2D is connected to the FB2 end of the commercial vehicle electronic control MCU and a capacitor C2, and the other end of the capacitor C2 is grounded.

[0016] Preferably, to determine the state of the high-side switch unit, the state of the high-side switch unit is determined according to the logic level of the IN end; when the logic level of the IN end is high, the state of the high-side switch unit is the driving state, and when the logic level of the IN end is low, the state of the high-side switch unit is the high-impedance state.

[0017] Preferably, to determine the diagnostic mode, the state of the control end and the state of the high-side switch unit are set, so as to determine that the diagnostic mode includes:

[0018] To determine the diagnostic mode, the diagnostic mode is determined according to the control mode and the logic level of the IN end.

[0019] When the control mode is high level and the logic level of the IN end is low, it is the first diagnostic mode;

[0020] When the control mode is low level and the logic level of the IN end is low, it is the second diagnostic mode;

[0021] When the control mode is low level and the logic level of the IN end is high, it is the third diagnostic mode.

[0022] Preferably, the solenoid valve states of the solenoid valve unit include the normal state of the solenoid valve, the state of the solenoid valve shorted to ground, the state of the solenoid valve open circuit, and the state of the solenoid valve shorted to the power supply.

[0023] Preferably, to determine the solenoid valve state of the solenoid valve unit, when determining the logic level of the FB end, when the voltage of the FB end is less than the set minimum threshold, the logic level of the FB end is low, and when the voltage of the FB end is greater than the set maximum threshold, the logic level of the FB end is high; the solenoid valve state of the solenoid valve unit is determined according to the logic level of the FB end.

[0024] In the first diagnostic mode:

[0025] When the FB end is at a high level, the electromagnetic unit is in a state of being shorted to the power supply;

[0026] In the second diagnostic mode:

[0027] When the FB terminal is at a high level, the electromagnetic unit is in an open circuit state;

[0028] In the third diagnostic mode:

[0029] When the level of the FB terminal is high, the electromagnetic unit is in a normal state; otherwise, the electromagnetic unit is in a short-circuit state to the ground.

[0030] In order to solve the above technical problems, the present invention also provides an electric control system based on an automobile intelligent chassis, which includes a circuit control system based on the automobile intelligent chassis.

[0031] The present invention has significant technical effects due to the adoption of the above technical solutions:

[0032] The circuit control system designed by the present invention is simple and low-cost for diagnosing the solenoid valve of the automobile intelligent chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a circuit diagram of the present invention.

[0034] Figure 2 It is an equivalent circuit diagram of the solenoid valve state mode 1 in the first diagnostic mode of the present invention.

[0035] Figure 3 1 is an equivalent circuit diagram of the solenoid valve state mode 2 in the first diagnosis mode of the present invention.

[0036] Figure 4 1 is an equivalent circuit diagram of the solenoid valve state mode 3 in the first diagnosis mode of the present invention.

[0037] Figure 5 4 is an equivalent circuit diagram of the solenoid valve state mode 4 in the first diagnosis mode of the present invention.

[0038] Figure 6 1 is an equivalent circuit diagram of the solenoid valve state mode 5 in the second diagnostic mode of the present invention.

[0039] Figure 7 1 is an equivalent circuit diagram of the solenoid valve state mode 6 in the second diagnosis mode of the present invention.

[0040] Figure 8 1 is an equivalent circuit diagram of the solenoid valve state mode 7 in the second diagnosis mode of the present invention.

[0041] Figure 9 1 is an equivalent circuit diagram of the solenoid valve state mode 9 in the third diagnosis mode of the present invention.

[0042] Figure 10It is the flow chart of the unloading solenoid valve of the present invention.

[0043] Figure 11 It is the flow chart of the backflush solenoid valve of the present invention. Detailed implementation manners

[0044] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0045] Embodiment 1

[0046] A circuit control system based on an intelligent chassis of a commercial vehicle, which includes a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and an electronic control MCU of a commercial vehicle; the output end of the solenoid valve unit is electrically connected to the fault diagnosis circuit unit, and the fault diagnosis unit is connected to the IN end of the electronic control MCU of the commercial vehicle through the high-side switch unit; the fault diagnosis circuit unit is connected to the control end and the FB end of the electronic control MCU of the commercial vehicle;

[0047] Fault diagnosis of the electronic control APU solenoid valve of a commercial vehicle is carried out through the circuit control system:

[0048] Determination of the state of the high-side switch unit, determining the state of the high-side switch unit according to the logic level of the IN end;

[0049] Setting of the control end state, after determining the state of the high-side switch unit, then setting the state of the control end according to the electronic control MCU of the commercial vehicle;

[0050] Determination of the diagnostic mode, after setting the state of the control end, determining the diagnostic mode according to the logic level and logic level of the FB end;

[0051] Determination of the solenoid valve state of the solenoid valve unit, after determining the diagnostic mode, determining the solenoid valve state of the solenoid valve unit according to the logic level of the FB end.

[0052] The solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit, and the first solenoid valve unit is connected to the first fault diagnosis circuit unit, and the second solenoid valve unit is connected to the second fault diagnosis circuit unit.

[0053] The described first fault diagnosis circuit unit includes a triode Q1; a resistor R1B is connected to the first end of the triode Q1, a resistor R1A and a resistor R1C are connected to the second end of the triode Q1, and the third end of the triode Q1 is grounded; the other end of the resistor R1B is connected to the Contr1 terminal of the commercial vehicle electronic control MCU; the other end of the resistor R1A is connected to a 24V voltage, the other end of the resistor R1C is connected to a resistor R1D and is connected to the OUT1 terminal of the first solenoid valve unit; the other end of the resistor R1D is connected to the FB1 terminal of the commercial vehicle electronic control MCU, and a capacitor C1, and the other end of the capacitor C1 is grounded;

[0054] The second fault diagnosis circuit unit includes a triode Q2; a resistor R2B is connected to the first end of the triode Q2, a resistor R2A and a resistor R2C are connected to the second end of the triode Q2, and the third end of the triode Q2 is grounded; the other end of the resistor R2B is connected to the Contr2 terminal of the commercial vehicle electronic control MCU; the other end of the resistor R2A is connected to a 24V voltage, the other end of the resistor R2C is connected to a resistor R2D and is connected to the OUT2 terminal of the first solenoid valve unit; the other end of the resistor R2D is connected to the FB2 terminal of the commercial vehicle electronic control MCU and a capacitor C2, and the other end of the capacitor C2 is grounded.

[0055] The determination of the diagnostic mode sets the states of the control terminal and the high-side switch unit, thereby determining that the diagnostic mode includes:

[0056] The determination of the diagnostic mode determines the diagnostic mode based on the control mode and the logic level of the IN terminal,

[0057] When the control mode is high level and the logic level of the IN terminal is low level, it is the first diagnostic mode;

[0058] When the control mode is low level and the logic level of the IN terminal is low level, it is the second diagnostic mode;

[0059] When the control mode is low level and the logic level of the IN terminal is high level, it is the third diagnostic mode.

[0060] The solenoid valve states of the solenoid valve unit include the solenoid valve normal state, the solenoid valve short-circuited to ground state, the solenoid valve open state, and the solenoid valve short-circuited to the power supply state.

[0061] Determination of the solenoid valve state of the solenoid valve unit. When determining the logic level of the FB terminal, if the voltage of the FB terminal is less than the set minimum threshold, the logic level of the FB terminal is low; if the voltage of the FB terminal is greater than the set maximum threshold, the logic level of the FB terminal is high. The solenoid valve state of the solenoid valve unit is determined based on the logic level of the FB terminal.

[0062] In the first diagnostic mode:

[0063] When the FB terminal is at a high level, the electromagnetic unit is in a short - circuit state to the power supply.

[0064] In the second diagnostic mode:

[0065] When the FB terminal is at a high level, the electromagnetic unit is in an open - circuit state.

[0066] In the third diagnostic mode:

[0067] When the level of the FB terminal is at a high level, the electromagnetic unit is in a normal state; otherwise, the electromagnetic unit is in a short - circuit state to the ground.

[0068] Embodiment 2

[0069] Based on Embodiment 1, in this embodiment, the first solenoid valve unit is a unloading solenoid valve, and the second solenoid valve unit is a back - blowing solenoid valve. In this embodiment, since the diagnostic circuits of the unloading solenoid valve unit and the back - blowing solenoid valve unit are the same, the unloading solenoid valve is used for illustration in this embodiment.

[0070] In Figure 1 The functions of resistor R1A, resistor R1C, and resistor R1D are mainly for current limiting. Resistor R1B and triode Q1 form a switching circuit to control the voltage at point A1. Capacitor C1 is a filtering capacitor. U9 is a high - side switch, IN1 is a general output port of the MCU. When IN1 = 1, the OUT1 port of the high - side switch outputs 24V, which is also called the driving state of the unloading solenoid valve. When IN1 = 0, the OUT1 port of the high - side switch outputs a high - impedance state; Contr1 is a general output port of the MCU. When Contr1 = 1, triode Q1 conducts to the ground, and the power supply at point A is 0V. When Contr1 = 0, triode Q1 is cut off, and the triode outputs a high - impedance state. FB1 is a general input port of the MCU. When the input voltage of FB1 ≤ 1V, the MCU recognizes it as logic level 0. When the input voltage of FB1 ≥ 4V, the MCU recognizes it as logic level 1.

[0071] For the solenoid valve used in the electric control APU, sufficient power must be available to drive it. For a 24V solenoid valve with a resistance of approximately 80Ω, a voltage of ≥16V must be directly applied to the solenoid valve to drive it to control the air circuit. In this embodiment, 24V is connected to the solenoid valve through a resistor. If the resistor is small enough, it will drive the solenoid valve to operate. Therefore, when designing, the relevant current-limiting resistor cannot be too small. Assuming a 24V system, the resistance value of resistor R1A is set to 33KΩ, the resistance value of resistor R1B is 10KΩ, and the resistance values of resistor R1C and resistor R1D are both 51KΩ.

[0072] The ground short state of the unloading solenoid valve means that the OUT1 port is shorted to the ground and the voltage of the OUT1 port is 0V; the open circuit short state of the unloading solenoid valve means that the connection between the OUT1 port and the unloading solenoid valve is disconnected; the power short state of the unloading solenoid valve means that the OUT1 port is shorted to the system power supply and the voltage of the OUT1 port is 24V.

[0073] The MCU controls the levels of Contr1 and IN1, causing FB1 to change differently in the four states of the unloading solenoid valve, thereby identifying the state of the unloading solenoid valve.

[0074] Three diagnostic control modes are executed periodically. First, diagnostic control mode 1 is executed, then diagnostic control mode 2, and finally diagnostic control mode 3. By the different logic levels of FB1, the state of the unloading solenoid valve is identified, thereby diagnosing the fault state of the unloading solenoid valve in real time. The list of items related to the diagnosis of the unloading solenoid valve is shown in Table 1.

[0075] Table 1 List of items related to the diagnosis of the unloading solenoid valve

[0076]

[0077] In Table 1, in the first diagnostic mode: when the state mode is 1, the state of the solenoid valve is the normal state;

[0078] when the state mode is 2, the state of the solenoid valve is the ground short state;

[0079] when the state mode is 3, the state of the solenoid valve is the open circuit state;

[0080] when the state mode is 4, the state of the solenoid valve is the power short state;

[0081] In the second diagnostic mode:

[0082] when the state mode is 5, the state of the solenoid valve is the normal state;

[0083] when the state mode is 6, the state of the solenoid valve is the ground short state;

[0084] when the state mode is 7, the state of the solenoid valve is the open circuit state;

[0085] When the status mode is 8, the status of the solenoid valve is a short circuit to the power supply.

[0086] In the third diagnostic mode:

[0087] When the status mode is 9, the status of the solenoid valve is normal.

[0088] When the status mode is 10, the status of the solenoid valve is a short circuit to the ground.

[0089] When the status mode is 11, the status of the solenoid valve is open circuit.

[0090] When the status mode is 12, the status of the solenoid valve is a short circuit to the power supply.

[0091] Figure 2 It is the equivalent circuit simulation test diagram for status mode 1 in the first diagnostic mode.

[0092] Figure 3 [[ID=2,5]]It is the equivalent circuit simulation test diagram for status mode 2 in the first diagnostic mode.

[0093] Figure 4 It is the equivalent circuit simulation test diagram for status mode 3 in the first diagnostic mode.

[0094] Figure 5 It is the equivalent circuit simulation test diagram for status mode 4 in the first diagnostic mode. Table 2: Status table of items related to unloading solenoid valve diagnosis - 1

[0095]

[0096] When Contr1 = 1 and IN1 = 0, if FB1 = 1, it indicates that the status of the unloading solenoid valve is a short circuit to the power supply circuit.

[0097] In the second diagnostic mode, Figure 6 It is the equivalent circuit simulation test diagram for status mode 5 in the second diagnostic mode. Figure 7 It is the equivalent circuit simulation test diagram for status mode 6 in the second diagnostic mode. Figure 8 It is the equivalent circuit simulation test diagram for status mode 7 in the second diagnostic mode. Table 3: Status table of items related to unloading solenoid valve diagnosis - 2

[0098]

[0099]

[0100] In the third diagnostic mode, Figure 9It is an equivalent circuit simulation test diagram for the state mode of 9 in the second diagnostic mode. The high-side switch has a short-circuit protection function. When IN1 = 1, the OUT1 port of the high-side switch outputs 24V. If the OUT1 port is short-circuited to the ground at this time, the short-circuit protection function of the high-side switch will be triggered, thereby disconnecting the 24V output. Therefore, when short-circuited, the voltage on OUT1 is always 0V.

[0101] Table 4 Summary of the Status Table of Items Related to the Diagnosis of the Unloading Solenoid Valve

[0102]

[0103]

[0104] Otherwise, in the second diagnostic mode, that is, Contr1 = 0, IN1 = 0; collect the logic level of the FB1 terminal. When the collected logic level of the FB1 terminal is high, the unloading solenoid valve is in an open state;

[0105] Otherwise, in the third diagnostic mode, that is, Contr1 = 0, IN1 = 1; collect the logic level of the FB1 terminal. When the collected logic level of the FB1 terminal is high, the unloading solenoid valve is in a normal state; otherwise, the unloading solenoid valve is in a short-circuit state to the ground.

[0106] In Figure 11 In the first diagnostic mode, that is, Contr2 = 1, IN2 = 0; collect the logic level of the FB2 terminal. When the collected logic level of the FB2 terminal is high, the back-blowing solenoid valve is in a short-circuit state to the power supply; otherwise, in the second diagnostic mode, that is, Contr2 = 0, IN2 = 0; collect the logic level of the FB2 terminal. When the collected logic level of the FB2 terminal is high, the back-blowing solenoid valve is in an open state;

[0107] Otherwise, in the third diagnostic mode, that is, Contr2 = 0, IN2 = 1; collect the logic level of the FB2 terminal. When the collected logic level of the FB2 terminal is high, the back-blowing solenoid valve is in a normal state; otherwise, the back-blowing solenoid valve is in a short-circuit state to the ground.

[0108] Embodiment 3

[0109] Based on the above embodiments, an electronic control APU solenoid valve fault diagnosis system for commercial vehicles in this embodiment is a system for implementing the method of diagnosing faults of the electronic control APU solenoid valve for commercial vehicles.

Claims

1. A circuit control system based on an intelligent automotive chassis, characterized in that, It includes a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and a commercial vehicle electronic control MCU; the output end of the solenoid valve unit is electrically connected to the fault diagnosis circuit unit, and the fault diagnosis unit is connected to the IN end of the commercial vehicle electronic control MCU through the high-side switch unit; the fault diagnosis circuit unit is connected to the control end and the FB end of the commercial vehicle electronic control MCU; Fault diagnosis of the solenoid valve of the commercial vehicle electronic control APU is carried out through the circuit control system: Determination of the state of the high-side switch unit, determining the state of the high-side switch unit according to the logic level of the IN end; Setting of the control end state, setting the state of the control end according to the commercial vehicle electronic control MCU; Determination of the diagnostic mode, setting the state of the control end and the high-side switch unit, thereby determining the diagnostic mode; Determination of the solenoid valve state of the solenoid valve unit, determining the diagnostic mode, and determining the solenoid valve state of the solenoid valve unit according to the logic level of the FB end.

2. The circuit control system based on the intelligent chassis of an automobile according to claim 1, wherein The solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit, and the first solenoid valve unit is connected to the first fault diagnosis circuit unit, and the second solenoid valve unit is connected to the second fault diagnosis circuit unit.

3. The circuit control system based on the intelligent chassis of an automobile according to claim 2, wherein The first fault diagnosis circuit unit includes a triode Q1; a resistor R1B is connected to the first end of the triode Q1, a resistor R1A and a resistor R1C are connected to the second end of the triode Q1, and the third end of the triode Q1 is grounded; the other end of the resistor R1B is connected to the Contr1 end of the commercial vehicle electronic control MCU; the other end of the resistor R1A is connected to a 24V voltage, the other end of the resistor R1C is connected to a resistor R1D and is connected to the OUT1 end of the first solenoid valve unit; the other end of the resistor R1D is connected to the FB1 end of the commercial vehicle electronic control MCU and a capacitor C1, and the other end of the capacitor C1 is grounded; The second fault diagnosis circuit unit includes a triode Q2; a resistor R2B is connected to the first end of the triode Q2, a resistor R2A and a resistor R2C are connected to the second end of the triode Q2, and the third end of the triode Q2 is grounded; the other end of the resistor R2B is connected to the Contr2 end of the commercial vehicle electronic control MCU; the other end of the resistor R2A is connected to a 24V voltage, the other end of the resistor R2C is connected to a resistor R2D and is connected to the OUT2 end of the first solenoid valve unit; the other end of the resistor R2D is connected to the FB2 end of the commercial vehicle electronic control MCU and a capacitor C2, and the other end of the capacitor C2 is grounded.

4. The circuit control system based on the intelligent chassis of an automobile according to claim 1, wherein The determination of the high-side switch unit state is based on the logic level of the IN terminal to determine the state of the high-side switch unit; when the logic level of the IN terminal is high, the high-side switch unit state is the driving state, and when the logic level of the IN terminal is low, the high-side switch unit state is the high-impedance state.

5. The circuit control system based on the intelligent chassis of an automobile according to claim 1, characterized in that, The determination of the diagnostic mode sets the state of the control terminal and the high-side switch unit state, thereby determining that the diagnostic mode includes: The determination of the diagnostic mode is based on the control mode and the IN terminal logic level to determine the diagnostic mode. When the control mode is high level and the logic level of the IN terminal is low, it is the first diagnostic mode. When the control mode is low level and the logic level of the IN terminal is low, it is the second diagnostic mode. When the control mode is low level and the logic level of the IN terminal is high, it is the third diagnostic mode.

6. The circuit control system based on the intelligent chassis of an automobile according to claim 1, wherein The solenoid valve state of the solenoid valve unit includes the solenoid valve normal state, the solenoid valve short-circuited to ground state, the solenoid valve open state, and the solenoid valve short-circuited to the power supply state.

7. The circuit control system based on the intelligent chassis of an automobile according to claim 1, characterized in that, The determination of the solenoid valve state of the solenoid valve unit: when the voltage of the FB terminal is less than the set minimum threshold, the logic level of the FB terminal is low; when the voltage of the FB terminal is greater than the set maximum threshold, the logic level of the FB terminal is high; the solenoid valve state of the solenoid valve unit is determined based on the logic level of the FB terminal. In the first diagnostic mode: When the FB terminal is high level, the electromagnetic unit is in the short-circuited to the power supply state. In the second diagnostic mode: When the FB terminal is high level, the electromagnetic unit is in the open state. In the third diagnostic mode: When the level of the FB terminal is high, the electromagnetic unit is in the normal state; otherwise, the electromagnetic unit is in the short-circuited to ground state.

8. The electronic control system based on the intelligent chassis of an automobile is characterized in that Including the circuit control system based on the automotive intelligent chassis according to any one of claims 1-7.

Images