Control method and system of automobile intelligent chassis electric control system

Abstract

The invention relates to an electromagnetic valve fault diagnosis technology, and discloses a control method and system for an automobile intelligent chassis electric control system, and the method comprises the steps: an electromagnetic valve unit, a fault diagnosis circuit unit, a high-side switch unit and a commercial vehicle electric control MCU are electrically connected; voltage signal acquisition: the AD end of the commercial vehicle electric control MCU acquires the voltage signal Vad of the fault diagnosis circuit unit in real time; the driving state of the electromagnetic valve unit is determined, and the driving state of the electromagnetic valve unit is determined by controlling the input level of the IN end through an electric control MCU of the commercial vehicle; and determining the state of the electromagnetic valve, wherein the state of the electromagnetic valve is determined according to the driving state of the electromagnetic valve unit and the voltage signals collected in real time. According to the method, whether the electromagnetic valve breaks down or not is judged by driving the electromagnetic valve, only one port resource is needed for diagnosis of each electromagnetic valve unit, few port resources are used, 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 a control method and system for an electronic control system of an intelligent chassis of an automobile. 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] As in the prior art 1: CN201610740760.5, an electronic control dryer assembly with an ECU controller and a control method.

[0004] As in the prior art 2: CN105549578B, a patent for invention published on January 30, 2018 discloses a vehicle solenoid valve fault diagnosis and response circuit 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.

[0006] It is necessary to drive the solenoid valve through the integrated chip BTS7236W to find a fault, that is, a fault can only be found when the solenoid valve is working. However, in the electronic control APU, the solenoid valve does not work most of the time. The timeliness of the prior art solution is poor.

[0007] 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 gas paths 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.

[0008] The electronic control APU is mainly a 24V system, and there is also a 12V system. The solenoid valves used are divided into two categories: 24V solenoid valves and 12V solenoid valves. The resistance of a 24V solenoid valve is about 80Ω, and the resistance of a 12V solenoid valve is about 20Ω. During its installation, due to the negligence of workers, there may be a possibility of mixed installation. Summary of the Invention

[0009] In view of the problems in the prior art that 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 the specific fault state of the solenoid valve, the present invention provides a control method and system for an automotive intelligent chassis electronic control system.

[0010] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0011] A control method for an automotive intelligent chassis electronic control system includes a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and a commercial vehicle electronic control MCU.

[0012] The OUT terminal of the high-side switch unit is connected to the fault diagnosis circuit unit and the solenoid valve unit.

[0013] The voltage acquisition terminal AD of the fault diagnosis circuit unit is connected to the commercial vehicle electronic control MCU; the IN terminal of the high-side switch unit is connected to the commercial vehicle electronic control MCU.

[0014] The method for diagnosing solenoid valve faults includes: the solenoid valve unit, the fault diagnosis circuit unit, the high-side switch unit, and the commercial vehicle electronic control MCU are electrically connected.

[0015] The AD terminal of the commercial vehicle electronic control MCU collects the voltage signal Vad of the fault diagnosis circuit unit in real time.

[0016] The determination of the driving state of the solenoid valve unit is to determine the driving state of the solenoid valve unit by the commercial vehicle electronic control MCU controlling the input level of the IN terminal.

[0017] The determination of the solenoid valve state is to determine the state of the solenoid valve according to the driving state of the solenoid valve unit and the voltage signal collected in real time.

[0018] Preferably: the solenoid valve unit includes a unloading solenoid valve and a backwashing solenoid valve; the fault diagnosis circuit unit includes a unloading solenoid valve fault diagnosis circuit and a backwashing solenoid valve fault diagnosis circuit;

[0019] The unloading solenoid valve and the unloading solenoid valve fault diagnosis circuit are connected to the OUT1 terminal of the high-side switch unit, and the unloading fault diagnosis circuit unit collects the voltage signal Vad1 of the unloading solenoid valve unit at the AD1 terminal in real time.

[0020] The backwashing solenoid valve and the backwashing solenoid valve fault diagnosis circuit are connected to the OUT2 terminal of the high-side switch unit, and the backwashing fault diagnosis circuit unit collects the voltage signal Vad2 of the backwashing solenoid valve unit at the AD2 terminal in real time.

[0021] Preferably: the unloading fault diagnosis circuit unit includes a reverse cutoff diode D1A, a resistor R1A, a resistor R1B, and a resistor R1; the resistance of the unloading solenoid valve unit is R 卸荷One end of the reverse cut-off diode D1A is connected to the input voltage V0; the other end is connected to the resistor R1A, the other end of the resistor R1A is connected to the resistor R1B, the resistor R1 and the unloading solenoid valve, the other end of the resistor R1 is connected to the AD1 terminal of the commercial vehicle electronic control MCU, and the other end of the resistor R1B is grounded;

[0022] The backflush fault diagnosis circuit unit includes a reverse cut-off diode D2A, resistors R2A, R2B and R2; the resistance of the backflush solenoid valve unit is R 反吹 One end of the reverse cut-off diode D2A is connected to the input voltage V0; the other end is connected to the resistor R2A, the other end of the resistor R2A is connected to the resistor R2B, the resistor R2 and the backflush solenoid valve, the other end of the resistor R2 is connected to the AD2 terminal of the commercial vehicle electronic control MCU, and the other end of the resistor R2B is grounded.

[0023] Preferably: the resistance values of the resistors R1B and R1 are much larger than the resistance value of R 卸荷 The resistance value of is equal to the resistance value of the resistor R1A, and R 卸荷 The resistance value of is equal to the resistance value of the resistor R1A;

[0024] The resistance values of the resistors R2B and R2 are much larger than the resistance value of R 反吹 The resistance value of is equal to the resistance value of the resistor R2A, and R 反吹 The resistance value of is equal to the resistance value of the resistor R2A.

[0025] Preferably: to determine the driving state of the solenoid valve unit, the input level of the IN terminal is controlled by the commercial vehicle electronic control MCU to determine the driving state of the solenoid valve unit; when the input level of the IN terminal controlled by the commercial vehicle electronic control MCU is high, the solenoid valve driving state is the driving state, otherwise the state of the solenoid valve unit is the non-driving state.

[0026] Preferably: to determine the state of the solenoid valve, the state of the solenoid valve is determined according to the driving state of the solenoid valve unit and the voltage signal collected in real time;

[0027] When the solenoid valve unit is in the driving state, determine whether there is a fault in the solenoid valve unit:

[0028] When the voltage Vad1 collected by the solenoid valve unit in real time is V 正常 , the solenoid valve unit is in the normal state;

[0029] When the voltage Vad1 collected by the solenoid valve unit in real time is 0V, the solenoid valve unit is in the state of short circuit to ground;

[0030] When the voltage Vad1 collected by the solenoid valve unit in real time is V 开路 , the solenoid valve unit is in the open circuit state;

[0031] When the voltage Vad1 collected in real time by the solenoid valve unit is V0, the solenoid valve unit is in a short - circuit state to the power supply;

[0032] When the voltage Vad1 collected in real time by the solenoid valve unit is V0, the solenoid valve unit is in a mixed - installation state;

[0033] When the voltage Vad1 collected in real time by the solenoid valve unit is V 混装 When, the solenoid valve unit is in a mixed - installation state; When the solenoid valve unit is in the driving state, it is determined whether there is a fault in the solenoid valve unit. When the voltage Vad1 collected in real time by the solenoid valve unit is not V 正常 , the state of the IN terminal of the solenoid valve unit is reset to the low - level state, and it returns to the non - driving state of the solenoid valve unit for the fault - mode diagnosis of the solenoid valve unit.

[0034] In order to solve the above technical problems, the present invention also provides an electronic control system for an intelligent vehicle chassis, which is used to implement any one of the control methods for the electronic control system of the intelligent vehicle chassis.

[0035] Due to the adoption of the above technical solutions, the present invention has remarkable technical effects:

[0036] The present invention judges whether there is a fault in the solenoid valve by driving the solenoid valve. The diagnosis of each solenoid valve unit only requires 1 port resource, with less use of port resources, simple diagnosis method, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is the circuit schematic diagram of the present invention.

[0038] Figure 2 is the solenoid valve fault diagnosis response circuit of the relevant resistance values of the unloading solenoid valve of the present invention.

[0039] Figure 3 is the equivalent circuit diagram and simulation test diagram of the unloading solenoid valve when IN1 is at a low level of the present invention.

[0040] Figure 4 is the simulation test diagram of the cali state when IN1 is at a low level of the present invention.

[0041] Figure 5 is the simulation test diagram of the mixed - installation state of the solenoid valve unit when IN1 is at a low level of the present invention.

[0042] Figure 6 is the simulation test diagram of the normal state of the solenoid valve unit when IN1 is at a high level of the present invention.

[0043] Figure 7 is the flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0045] Embodiment 1

[0046] A control method for an intelligent chassis electronic control system of a vehicle includes a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and a commercial vehicle electronic control APU.

[0047] The OUT terminal of the high-side switch unit is connected to the fault diagnosis circuit unit and the solenoid valve unit.

[0048] The voltage acquisition terminal AD of the fault diagnosis circuit unit is connected to the commercial vehicle electronic control APU.

[0049] The IN terminal of the high-side switch unit is connected to the commercial vehicle electronic control APU.

[0050] The method for solenoid valve fault diagnosis includes:

[0051] The solenoid valve unit, the fault diagnosis circuit unit, the high-side switch unit, and the commercial vehicle electronic control APU are electrically connected.

[0052] The AD terminal of the commercial vehicle electronic control MCU collects the voltage signal Vad of the fault diagnosis circuit unit in real time.

[0053] The determination of the driving state of the solenoid valve unit is to determine the driving state of the solenoid valve unit by controlling the input level of the IN terminal through the commercial vehicle electronic control APU.

[0054] The determination of the solenoid valve state is based on the driving state of the solenoid valve unit and the voltage signal collected in real time to determine the state of the solenoid valve.

[0055] The solenoid valve unit includes a unloading solenoid valve and a backwashing solenoid valve; the fault diagnosis circuit unit includes a unloading solenoid valve fault diagnosis circuit and a backwashing solenoid valve fault diagnosis circuit.

[0056] The unloading solenoid valve and the unloading solenoid valve fault diagnosis circuit are connected to the OUT1 terminal of the high-side switch unit, and the unloading fault diagnosis circuit unit collects the voltage signal Vad1 of the unloading solenoid valve unit at the AD1 terminal in real time.

[0057] The backwashing solenoid valve and the backwashing solenoid valve fault diagnosis circuit are connected to the OUT2 terminal of the high-side switch unit, and the backwashing fault diagnosis circuit unit collects the voltage signal Vad2 of the backwashing solenoid valve unit at the AD2 terminal in real time.

[0058] The unloading fault diagnosis circuit unit includes a reverse cutoff diode D1A, resistors R1A, R1B, and R1; the resistance of the unloading solenoid valve unit is R 卸荷; One end of the reverse cut-off diode D1A is connected to the input voltage V0; the other end is connected to the resistor R1A, the other end of the resistor R1A is connected to the resistor R1B, the resistor R1 and the unloading solenoid valve, the other end of the resistor R1 is connected to the AD1 terminal of the commercial vehicle electronic control APU, and the other end of the resistor R1B is grounded;

[0059] The backflush fault diagnosis circuit unit includes a reverse cut-off diode D2A, resistors R2A, R2B and R2; the resistance of the backflush solenoid valve unit is R 反吹 ; One end of the reverse cut-off diode D2A is connected to the input voltage V0; the other end is connected to the resistor R2A, the other end of the resistor R2A is connected to the resistor R2B, the resistor R2 and the backflush solenoid valve, the other end of the resistor R2 is connected to the AD2 terminal of the commercial vehicle electronic control APU, and the other end of the resistor R2B is grounded.

[0060] The resistance values of the resistor R1B and the resistor R1 are much larger than the resistance value of R 卸荷 The resistance value of is equal to the resistance value of the resistor R1A, R 卸荷 The resistance value of is equal to the resistance value of the resistor R1A;

[0061] The resistance values of the resistor R2B and the resistor R2 are much larger than the resistance value of R 反吹 The resistance value of is equal to the resistance value of the resistor R2A, R 反吹 The resistance value of is equal to the resistance value of the resistor R2A.

[0062] The determination of the driving state of the solenoid valve unit is to determine the driving state of the solenoid valve unit by controlling the input level of the IN terminal by the commercial vehicle electronic control APU; when the input level of the IN terminal controlled by the commercial vehicle electronic control APU is high, the solenoid valve driving state is the driving state, otherwise the state of the solenoid valve unit is the non-driving state.

[0063] The determination of the solenoid valve state is to determine the state of the solenoid valve according to the driving state of the solenoid valve unit and the voltage signal collected in real time;

[0064] When the solenoid valve unit is in the driving state, it is determined whether there is a fault in the solenoid valve unit:

[0065] When the voltage Vad1 collected in real time by the solenoid valve unit is V 正常 , then the solenoid valve unit is in the normal state;

[0066] When the voltage Vad1 collected in real time by the solenoid valve unit is 0V, then the solenoid valve unit is in the ground short circuit state;

[0067] When the voltage Vad1 collected in real time by the solenoid valve unit is V 开路 , then the solenoid valve unit is in the open circuit state;

[0068] When the voltage Vad1 collected by the solenoid valve unit in real time is V0, the solenoid valve unit is in a short - circuit state to the power supply;

[0069] When the voltage Vad1 collected by the solenoid valve unit in real time is V 混装 , the solenoid valve unit is in a mixed - assembly state;

[0070] When the voltage Vad1 collected by the solenoid valve unit in real time is V 混装 , the solenoid valve unit is in a mixed - assembly state; When the solenoid valve unit is in the driving state, it is determined whether there is a fault in the solenoid valve unit. When the voltage Vad1 collected by the solenoid valve unit in real time is not V 正常 , the state of the IN terminal of the solenoid valve unit is reset to the low - level state, and it returns to the non - driving state of the solenoid valve unit for fault - mode diagnosis of the solenoid valve unit.

[0071] Embodiment 2

[0072] Based on Embodiment 1, this embodiment is an automotive intelligent chassis electronic control system, which is used to implement any one of the automotive intelligent chassis electronic control system control methods.

[0073] Embodiment 3

[0074] Based on Embodiment 1, since the diagnostic circuit units of the unloading solenoid valve and the back - blowing solenoid valve are the same, this embodiment takes the unloading solenoid valve as an example for relevant description.

[0075] In Figure 1 , V9 is a high - side switch unit, IN1 is a common output port of the APU for commercial vehicle electronic control. When IN1 = 1, the channel 1 of the high - side switch unit is turned on, and the OUT1 port of the high - side switch unit outputs 24V, which is also called the driving state of the unloading solenoid valve; when IN1 = 0, the channel 1 of the high - side switch unit is turned off, and the OUT1 port of the high - side switch unit outputs a high - impedance state.

[0076] Figure 2 In

[0077] , D1A is a reverse - cut - off diode. Its main function is to prevent the 24V voltage from acting on the input voltage V0 through the resistor R1A, and V0 is 5V, so as not to affect the stability of the 5V system. Another function of the reverse - cut - off diode is to divide the voltage.

[0078] In this embodiment, the resistance value of resistor R1A is 80 Ω, the resistance value of resistor R1B is 20 KΩ, the resistance value of resistor R1 is 51 KΩ, and the reverse cut-off diode D1A uses 1N4007G. The voltage of the working power supply for the commercial vehicle electronic control to control the APU is 5V. The real-time voltage value collected by the AD acquisition port AD1 is represented by the symbol Va; when calculating the voltage value, an approximate value is taken, and the subsequent software control logic will consider the calculation error and the error caused by temperature change. The voltage on OUT1 is represented by the symbol V1.

[0079] In the voltage dividing network composed of the unloading solenoid valve diagnostic circuit and the unloading solenoid valve, R1 is a current limiting resistor, and the voltages at both ends of it are approximately equal, so Va≈V1.

[0080] Figure 3 When IN1 = 0, it is the equivalent circuit and simulation test diagram related to the unloading solenoid valve, where V1 = 2.14V, so Va≈V1 = 2.14V.

[0081] The state of the solenoid valve shorted to ground means that the OUT1 port is shorted to ground. After being shorted to ground, V1 = 0V, and the voltages at both ends of R1 are approximately equal, so Va≈V1 = 0V.

[0082] The state of the solenoid valve open-circuited or shorted means that the connection between the OUT1 port and the solenoid valve is disconnected. From Figure 4 It can be seen that V1 = 4.5V, and the voltages at both ends of R1 are approximately equal, so Va≈V1 = 4.5V.

[0083] The state of the solenoid valve shorted to the power supply means that the OUT1 port is shorted to the system power supply. After being shorted to the power supply, V1 = 24V, and the voltages at both ends of R1 are approximately equal, so Va≈V1 = 24V. For the AD acquisition system of the MCU, if the port voltage is greater than 5V, it is recognized as 5V. So Va≈5V.

[0084] The state of the solenoid valve replacement means that a 24V solenoid valve with a resistance of 80 Ω is installed as a 12V solenoid valve with a resistance of 20 Ω.

[0085] From Figure 5 It can be seen that V1 = 853mV, and the voltages at both ends of R1 are approximately equal, so Va≈V1 = 0.85V.

[0086] Taking into account the calculation error and the error caused by temperature change at the same time, there is the following control logic:

[0087] Table 1 Control Logic Table for the State of the Unloading Solenoid Valve

[0088]

[0089]

[0090] Figure 6In the normal state, when the intelligent APU system meets certain conditions and needs to drive the unloading solenoid valve, the MCU sets IN to 1. When IN = 1, V1 = 24V, so Va ≈ V1 = 24V. For the AD acquisition system of the MCU, if the port voltage is greater than 5V, it is recognized as 5V. So Va ≈ 5V. If it does not hold, there is a fault, and the MCU sets IN to 0 to re-determine the fault state.

[0091] In the flowchart, when IN1 is 0, the voltage of AD1 port is collected to Va1; when the collected voltage Va1 is less than or equal to 0.1V, the unloading solenoid valve is in a short-circuit state to the ground; otherwise, it is judged whether the collected voltage Va1 is in the range of 0.5V to 1.2V. If it is in this range, the unloading solenoid valve is in a mixed installation state; otherwise, it is judged whether the collected voltage Va1 is in the range of 4.3V to 4.7V. If it is in this range, the unloading solenoid valve is in an open-circuit state; otherwise, it is judged whether the collected voltage Va1 is greater than or equal to 4.9V; if it is in this range, the unloading solenoid valve is in a short-circuit state to the power supply, otherwise it is judged whether the collected voltage Va1 is in the range of 1.8V to 2.5V; if it is in this range, the unloading solenoid valve is in a normal state; otherwise, it is judged whether the unloading solenoid valve meets the driving conditions. When the driving conditions are met, IN is set to 1; when IN is 1, the voltage of the acquisition end is judged. When it is judged whether the collected voltage Va1 is less than 4.9V, in this range, IN is set to 0 through the MCU to re-determine the fault state.

Claims

1. A control method for an electronic control system of an intelligent chassis of an automobile, including a solenoid valve unit, a fault diagnosis circuit unit, a high-side switch unit, and an electronic control MCU for commercial vehicles, The OUT terminal of the high-side switch unit is connected to the fault diagnosis circuit unit and the solenoid valve unit; The voltage acquisition terminal AD terminal of the fault diagnosis circuit unit is connected to the electronic control MCU for commercial vehicles; The IN terminal of the high-side switch unit is connected to the electronic control MCU for commercial vehicles; The method for solenoid valve fault diagnosis includes: The solenoid valve unit, the fault diagnosis circuit unit, the high-side switch unit, and the electronic control MCU for commercial vehicles are electrically connected; Acquisition of voltage signals, the AD terminal of the electronic control MCU for commercial vehicles collects the voltage signal Vad of the fault diagnosis circuit unit in real time; Determination of the driving state of the solenoid valve unit, the input level of the IN terminal is controlled by the electronic control MCU for commercial vehicles to determine the driving state of the solenoid valve unit; Determination of the solenoid valve state, the state of the solenoid valve is determined according to the driving state of the solenoid valve unit and the voltage signal collected in real time.

2. A control method for an automotive intelligent chassis electronic control system according to claim 1, characterized in that: The solenoid valve unit includes a unloading solenoid valve and a backflush solenoid valve; the fault diagnosis circuit unit includes a unloading solenoid valve fault diagnosis circuit and a backflush solenoid valve fault diagnosis circuit; The unloading solenoid valve and the unloading solenoid valve fault diagnosis circuit are connected to the OUT1 terminal of the high-side switch unit, and the unloading fault diagnosis circuit unit collects the voltage signal Vad1 of the unloading solenoid valve unit at the AD1 terminal in real time; The backflush solenoid valve and the backflush solenoid valve fault diagnosis circuit are connected to the OUT2 terminal of the high-side switch unit, and the backflush fault diagnosis circuit unit collects the voltage signal Vad2 of the backflush solenoid valve unit at the AD2 terminal in real time.

3. The control method of an intelligent chassis electronic control system for an automobile according to claim 1, characterized in that: The unloading fault diagnosis circuit unit includes a reverse cut-off diode D1A, resistors R1A, R1B, and R1; the resistance of the unloading solenoid valve unit is R 卸荷 ; one end of the reverse cut-off diode D1A is connected to the input voltage V0; the other end is connected to the resistor R1A, the other end of the resistor R1A is connected to the resistor R1B, the resistor R1, and the unloading solenoid valve, the other end of the resistor R1 is connected to the AD1 terminal of the commercial vehicle electronic control MCU, and the other end of the resistor R1B is grounded; The backflush fault diagnosis circuit unit includes a reverse cutoff diode D2A, resistors R2A, R2B and R2; the resistance of the backflush solenoid valve unit is R 反吹 ; One end of the reverse blocking diode D2A is connected to the input voltage V0; the other end is connected to the resistor R2A, the other end of the resistor R2A is connected to the resistor R2B, the resistor R2 and the back-blowing solenoid valve, the other end of the resistor R2 is connected to the AD2 end of the commercial vehicle electronic control MCU, and the other end of the resistor R2B is grounded.

4. A control method for an intelligent chassis electronic control system of an automobile according to claim 1, characterized in that: The resistance values of resistor R1B and resistor R1 are much greater than that of R 卸荷 The resistance value of 卸荷 is equal to the resistance value of resistor R1A; The resistance values of resistor R2B and resistor R2 are much greater than that of R 反吹 The resistance value of 反吹 is equal to the resistance value of resistor R2A.

5. A control method for an intelligent chassis electronic control system of an automobile according to claim 1, characterized in that: Determination of the driving state of the solenoid valve unit, the input level of the IN terminal is controlled by the electronic control MCU for commercial vehicles to determine the driving state of the solenoid valve unit; when the input level of the IN terminal controlled by the electronic control MCU for commercial vehicles is high, the driving state of the solenoid valve is the driving state, otherwise the state of the solenoid valve unit is the non-driving state.

6. A control method for an automotive intelligent chassis electronic control system according to claim 1, characterized in that: Determination of the solenoid valve state, the state of the solenoid valve is determined according to the driving state of the solenoid valve unit and the voltage signal collected in real time; when the solenoid valve unit is in the driving state, it is determined whether there is a fault in the solenoid valve unit, When the solenoid valve is in the non-driving state, the fault mode diagnosis of the solenoid valve unit is carried out, When the voltage Vad1 collected by the solenoid valve unit in real time is V 正常 the solenoid valve unit is in a normal state; When the voltage Vad1 collected by the solenoid valve unit in real time is 0V, the solenoid valve unit is in a short-circuit state to the ground; When the voltage Vad1 collected in real time by the solenoid valve unit is V 开路 the solenoid valve unit is in an open circuit state; When the voltage Vad1 collected by the solenoid valve unit in real time is V0, the solenoid valve unit is in a short-circuit state to the power supply; When the voltage Vad1 collected by the solenoid valve unit in real time is V 混装 , the solenoid valve unit is in a mixed state; when the solenoid valve unit is in the driving state, it is determined whether there is a fault in the solenoid valve unit. When the voltage Vad1 collected by the solenoid valve unit in real time is not V 正常 , the state of the IN terminal of the solenoid valve unit is reset to the low level state, and the fault mode diagnosis of the solenoid valve unit is returned to when the solenoid valve unit is in the non-driving state.

7. An electronic control system for an intelligent chassis of an automobile, characterized in that, It is used to implement the control method for an electronic control system of an intelligent chassis of an automobile according to any one of claims 1-6.

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