Electronic control system based on intelligent chassis of automobile and circuit control system thereof

Abstract

The application relates to an electromagnetic valve fault diagnosis technology and discloses an electric control system based on an automobile intelligent chassis and a circuit control system thereof, which comprises the following steps: setting a control end state, setting the control end state according to a commercial vehicle electric control control MCU; determining a diagnosis mode, setting the control end state and a high-side switch unit state, thereby determining the diagnosis mode; determining an electromagnetic valve state of an electromagnetic valve unit, determining the diagnosis mode, and determining the electromagnetic valve state of the electromagnetic valve unit according to a logic level of an FB end. The circuit control system designed by the application 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] This invention relates to solenoid valve fault diagnosis technology, and more particularly to an electronic control system and its circuit control system based on an automotive intelligent chassis. Background Technology

[0002] The electronically controlled dryer assembly with an ECU controller has protective functions, greatly extending the dryer's service life. Its main body contains an unloading solenoid valve and a backflush solenoid valve. Electrical malfunctions in the solenoid valves during use may affect the dryer's functionality.

[0003] For example, in prior art 1: CN201610740760.5, there is an electronically controlled dryer assembly with an ECU controller and a control method thereof.

[0004] For example, prior art 2: CN105549578B, an invention patent published on January 30, 2018, discloses a fault diagnosis and response circuit for automotive 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] Existing technologies suffer from complex circuitry, high costs, and the inability to pinpoint the specific type of solenoid valve malfunction, only allowing detection of faults. They require the BTS7236W integrated chip to drive the solenoid valve before a fault can be detected, meaning the fault can only be detected when the solenoid valve is operational. However, the solenoid valve remains inactive most of the time due to the limitations of existing electronically controlled APUs, resulting in poor timeliness.

[0006] Diagnosing each solenoid valve requires four port resources: an information output port, a main control signal output port, a secondary control signal output port, and a voltage input port. Diagnosing two solenoid valves requires eight port resources. The electronically controlled APU (Air Processing Unit), building upon the electronically controlled dryer, adds management of different air paths, achieving more precise and efficient air handling, significantly increasing the port resource requirements. Summary of the Invention

[0007] This invention addresses the problem of complex and costly diagnostic operations for solenoid valves on automotive intelligent chassis in the prior art by providing an electronic control system and its circuit control system based on an automotive intelligent chassis.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

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

[0010] The state of the high-side switch unit is determined based on the logic level of the IN terminal.

[0011] The control terminal status is set according to the commercial vehicle electronic control MCU settings.

[0012] The diagnostic mode is determined by setting the state of the control terminal and the state of the high-side switch unit.

[0013] The solenoid valve state of the solenoid valve unit is determined, the diagnostic mode is determined, and the solenoid valve state of the solenoid valve unit is determined based on the logic level of the FB terminal.

[0014] Preferably, the solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, and the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit, with the first solenoid valve unit connected to the first fault diagnosis circuit unit and the second solenoid valve unit connected to the second fault diagnosis circuit unit. Preferably, the first fault diagnosis circuit unit includes a transistor Q1; a resistor R1B is connected to the first terminal of transistor Q1, resistors R1A and R1C are connected to the second terminal of transistor Q1, and the third terminal of transistor Q1 is grounded; the other terminal of resistor R1B is connected to the Control1 terminal of the commercial vehicle electronic control MCU; the other terminal of resistor R1A is connected to a 24V voltage; the other terminal of resistor R1C is connected to resistor R1D and is connected to the OUT1 terminal of the first solenoid valve unit; the other terminal of resistor R1D is connected to the FB1 terminal of the commercial vehicle electronic control MCU; and a capacitor C1, with the other terminal of capacitor C1 grounded.

[0015] The second fault diagnosis circuit unit includes a transistor Q2; the first terminal of the transistor Q2 is connected to a resistor R2B, the second terminal of the transistor Q2 is connected to resistors R2A and R2C, and the third terminal of the transistor Q2 is grounded; the other terminal of the resistor R2B is connected to the Control2 terminal of the commercial vehicle electronic control MCU; the other terminal of the resistor R2A is connected to a 24V voltage, the other terminal 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 terminal of the resistor R2D is connected to the FB2 terminal of the commercial vehicle electronic control MCU and a capacitor C2, and the other terminal of the capacitor C2 is grounded.

[0016] Preferably, the state of the high-side switch unit is determined based on the logic level of the IN terminal; when the logic level of the IN terminal is high, the high-side switch unit is in a driving state, and when the logic level of the IN terminal is low, the high-side switch unit is in a high-impedance state.

[0017] Preferably, the diagnostic mode is determined by setting the control terminal state and the high-side switch unit state, thereby determining the diagnostic mode as follows:

[0018] The diagnostic mode is determined based on the control mode and the logic level of the IN terminal.

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

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

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

[0022] Preferably, 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-circuited state, and the solenoid valve short-circuited to the power supply state.

[0023] Preferably, the solenoid valve state of the solenoid valve unit is determined by the logic level of the FB terminal. When the voltage at the FB terminal is less than a set minimum threshold, the logic level of the FB terminal is low; when the voltage at the FB terminal is greater than a 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.

[0024] In the first diagnostic mode:

[0025] When the FB terminal is high, the electromagnetic unit is in a short-circuit state to the power supply.

[0026] Second diagnostic mode:

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

[0028] In the third diagnostic mode:

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

[0030] To address the aforementioned technical problems, the present invention also provides an electronic control system based on an intelligent automotive chassis, which includes a circuit control system based on the intelligent automotive chassis.

[0031] This invention, by adopting the above technical solutions, has significant technical effects:

[0032] The circuit control system designed in this invention provides a simple and low-cost diagnostic method for electromagnetic valves in automotive intelligent chassis. Attached Figure Description

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

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

[0035] Figure 3 This is the equivalent circuit diagram of the solenoid valve state mode 2 under the first diagnostic mode of the present invention.

[0036] Figure 4 This is the equivalent circuit diagram of the solenoid valve state mode 3 under the first diagnostic mode of the present invention.

[0037] Figure 5 This is the equivalent circuit diagram of the solenoid valve state mode 4 under the first diagnostic mode of the present invention.

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

[0039] Figure 7 This is the equivalent circuit diagram of the solenoid valve state mode 6 under the second diagnostic mode of the present invention.

[0040] Figure 8 This is the equivalent circuit diagram of the solenoid valve state mode 7 under the second diagnostic mode of the present invention.

[0041] Figure 9 This is the equivalent circuit diagram of the solenoid valve state mode 9 under the third diagnostic mode of the present invention.

[0042] Figure 10This is a flowchart of the unloading solenoid valve of the present invention.

[0043] Figure 11 This is a flowchart of the backflush solenoid valve of the present invention. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0045] Example 1

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

[0047] Fault diagnosis of APU solenoid valve in commercial vehicle electronic control system:

[0048] The state of the high-side switch unit is determined based on the logic level of the IN terminal.

[0049] The setting of the control terminal state determines the state of the high-side switch unit, and then the state of the control terminal is set according to the commercial vehicle electronic control MCU.

[0050] The diagnostic mode is determined by setting the state of the control terminal and determining the diagnostic mode based on the logic level of the FB terminal.

[0051] The solenoid valve state of the solenoid valve unit is determined, the diagnostic mode is determined, and the solenoid valve state of the solenoid valve unit is determined based on the logic level of the FB terminal.

[0052] The solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, and the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit. 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 first fault diagnosis circuit unit includes a transistor Q1; the first terminal of the transistor Q1 is connected to a resistor R1B, the second terminal of the transistor Q1 is connected to resistors R1A and R1C, and the third terminal of the transistor Q1 is grounded; the other terminal of the resistor R1B is connected to the Control1 terminal of the commercial vehicle electronic control MCU; the other terminal of the resistor R1A is connected to a 24V voltage; the other terminal 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 terminal of the resistor R1D is connected to the FB1 terminal of the commercial vehicle electronic control MCU, and a capacitor C1, the other terminal of which is grounded.

[0054] The second fault diagnosis circuit unit includes a transistor Q2; the first terminal of the transistor Q2 is connected to a resistor R2B, the second terminal of the transistor Q2 is connected to resistors R2A and R2C, and the third terminal of the transistor Q2 is grounded; the other terminal of the resistor R2B is connected to the Control2 terminal of the commercial vehicle electronic control MCU; the other terminal of the resistor R2A is connected to a 24V voltage, the other terminal 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 terminal of the resistor R2D is connected to the FB2 terminal of the commercial vehicle electronic control MCU and a capacitor C2, and the other terminal of the capacitor C2 is grounded.

[0055] The diagnostic mode is determined by setting the control terminal state and the high-side switch unit state, thereby determining the diagnostic mode as follows:

[0056] The diagnostic mode is determined based on the control mode and the logic level of the IN terminal.

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

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

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

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

[0061] The solenoid valve state of the solenoid valve unit is determined by the logic level of the FB terminal. When the voltage at the FB terminal is less than the set minimum threshold, the logic level of the FB terminal is low; when the voltage at 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 high, the electromagnetic unit is in a short-circuit state to the power supply.

[0064] Second diagnostic mode:

[0065] When the FB terminal is high, the electromagnetic unit is in an open circuit state;

[0066] In the third diagnostic mode:

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

[0068] Example 2

[0069] Based on Example 1, in this example, the first solenoid valve unit is an unloading solenoid valve and the second solenoid valve unit is a backflush solenoid valve. In this example, since the diagnostic circuits of the unloading solenoid valve unit and the backflush solenoid valve unit are the same, this example will be described using the unloading solenoid valve.

[0070] exist Figure 1 In this circuit, resistors R1A, R1C, and R1D are primarily used for current limiting. Resistor R1B and transistor Q1 form a switching circuit to control the voltage at point A1. Capacitor C1 is a filter capacitor. U9 is a high-side switch. IN1 is the MCU's general-purpose output port. When IN1 = 1, the high-side switch OUT1 outputs 24V, also known as the unloading solenoid valve drive state. When IN1 = 0, the high-side switch OUT1 outputs a high-impedance state. Contr1 is the MCU's general-purpose output port. When Contr1 = 1, transistor Q1 is conducting and grounded, and the power supply at point A is 0V. When Contr1 = 0, transistor Q1 is cut off, and the transistor outputs a high-impedance state. FB1 is the MCU's general-purpose input port. When the FB1 input voltage is ≤ 1V, the MCU recognizes it as logic level 0. When the FB1 input voltage is ≥ 4V, the MCU recognizes it as logic level 1.

[0071] For solenoid valves used in electronically controlled APUs, sufficient power is required to drive them. A 24V solenoid valve, with a resistance of approximately 80Ω, requires a voltage of ≥16V directly applied to it to actuate and control the pneumatic circuit. In this embodiment, the 24V is connected to the solenoid valve through a resistor. If the resistor is sufficiently small, it will drive the solenoid valve. Therefore, the current-limiting resistors must be carefully designed. Assuming a 24V system, resistor R1A is set to 33KΩ, resistor R1B to 10KΩ, and resistors R1C and R1D to 51KΩ each.

[0072] The unloading solenoid valve is in a short-circuit state to ground when the OUT1 port is short-circuited to ground and the voltage at the OUT1 port is 0V; the unloading solenoid valve is in an open-circuit short-circuit state when the connection between the OUT1 port and the unloading solenoid valve is disconnected; the unloading solenoid valve is in a short-circuit state to the power supply when the OUT1 port is short-circuited to the system power supply and the voltage at the OUT1 port is 24V.

[0073] The MCU controls the levels of Control1 and IN1 to make FB1 exhibit different changes 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; then, diagnostic control mode 2; and finally, diagnostic control mode 3. The status of the unloading solenoid valve is identified by the different logic levels of FB1, thereby diagnosing the fault status of the unloading solenoid valve in real time. A list of diagnostic items for the unloading solenoid valve is shown in Table 1.

[0075] Table 1. List of Diagnostic Items for Unloading Solenoid Valves

[0076]

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

[0078] When the state mode is 2, the solenoid valve is in a short-circuit state to ground.

[0079] When the state mode is 3, the solenoid valve is in the open circuit state;

[0080] When the state mode is 4, the solenoid valve is in a short-circuit state to the power supply.

[0081] Second diagnostic mode:

[0082] When the status mode is 5, the solenoid valve is in the normal state;

[0083] When the state mode is 6, the solenoid valve is in a short-circuit state to ground.

[0084] When the status mode is 7, the solenoid valve is in the open circuit state;

[0085] When the state mode is 8, the solenoid valve is in a short-circuit state to the power supply.

[0086] Third diagnostic mode:

[0087] When the status mode is 9, the solenoid valve is in the normal state;

[0088] When the state mode is 10, the solenoid valve is in a short-circuit state to ground.

[0089] When the status mode is 11, the solenoid valve is in the open circuit state;

[0090] When the state mode is 12, the solenoid valve is in a short-circuit state to the power supply.

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

[0092] Figure 3 This is the simulation test diagram of the equivalent circuit in state mode 2 under the first diagnostic mode.

[0093] Figure 4 This is the simulation test diagram of the equivalent circuit in state mode 3 under the first diagnostic mode.

[0094] Figure 5 The equivalent circuit simulation test diagram for state mode 4 in the first diagnostic mode is shown in Table 2: State Table 1 for Diagnostic Related Items of the Unloading Solenoid Valve.

[0095]

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

[0097] In the second diagnostic mode, Figure 6 This is the simulation test diagram of the equivalent circuit in state mode 5 under the second diagnostic mode. Figure 7 This is the simulation test diagram of the equivalent circuit for state mode 6 in the second diagnostic mode. Figure 8 The equivalent circuit simulation test diagram for state mode 7 in the second diagnostic mode is shown in Table 3. Table 2 shows the diagnostic-related state items for the unloading solenoid valve.

[0098]

[0099]

[0100] In the third diagnostic mode Figure 9The equivalent circuit simulation test diagram is shown for state mode 9 in the second diagnostic mode. The high-side switch has a short-circuit protection function. When IN1=1, the high-side switch OUT1 outputs 24V. If OUT1 is short-circuited to 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 Diagnostic Items for Unloading Solenoid Valves

[0102]

[0103]

[0104] Otherwise, in the second diagnostic mode, i.e., Control1=0, IN1=0, the logic level of the FB1 terminal is collected. When the collected logic level of the FB1 terminal is high, the unloading solenoid valve is in the open circuit state.

[0105] Otherwise, in the third diagnostic mode, i.e., Control1=0 and IN1=1, the logic level of the FB1 terminal is collected. When the collected logic level of the FB1 terminal is high, the unloading solenoid valve is in normal state; otherwise, the unloading solenoid valve is in short-circuit state to ground.

[0106] exist Figure 11 In the first diagnostic mode, i.e., Control2=1 and IN2=0, the logic level of the FB2 terminal is collected. When the collected logic level of the FB2 terminal is high, the backflush solenoid valve is in a short-circuit state to the power supply. Otherwise, in the second diagnostic mode, i.e., Control2=0 and IN2=0, the logic level of the FB2 terminal is collected. When the collected logic level of the FB2 terminal is high, the backflush solenoid valve is in an open-circuit state.

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

[0108] Example 3

[0109] Based on the above embodiments, this embodiment provides a fault diagnosis system for a commercial vehicle electronically controlled APU solenoid valve, which is used to implement the aforementioned method for fault diagnosis of a commercial vehicle electronically controlled APU solenoid valve.

Claims

1. A circuit control system based on an automotive intelligent 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 terminal of the solenoid valve unit is electrically connected to the fault diagnosis circuit unit, and the fault diagnosis circuit unit is connected to the IN terminal of the commercial vehicle electronic control MCU through the high-side switch unit; the fault diagnosis circuit unit is connected to the control terminal and the FB terminal of the commercial vehicle electronic control MCU. Diagnostic of faults in the solenoid valves of the electronically controlled APU in commercial vehicles using the aforementioned circuit control system: The state of the high-side switch unit is determined based on the logic level of the IN terminal. The control terminal status is set according to the commercial vehicle electronic control MCU settings. The diagnostic mode is determined by setting the state of the control terminal and the state of the high-side switch unit. The solenoid valve state of the solenoid valve unit is determined, the diagnostic mode is determined, and the solenoid valve state of the solenoid valve unit is determined based on the logic level of the FB terminal.

2. The circuit control system based on an automotive intelligent chassis according to claim 1, characterized in that, The solenoid valve unit includes a first solenoid valve unit and a second solenoid valve unit, and the fault diagnosis circuit unit includes a first fault diagnosis circuit unit and a second fault diagnosis circuit unit. 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 an automotive intelligent chassis according to claim 2, characterized in that, The first fault diagnosis circuit unit includes a transistor Q1; the first terminal of the transistor Q1 is connected to a resistor R1B, the second terminal of the transistor Q1 is connected to resistors R1A and R1C, and the third terminal of the transistor Q1 is grounded; the other terminal of the resistor R1B is connected to the Control1 terminal of the commercial vehicle electronic control MCU; the other terminal of the resistor R1A is connected to a 24V voltage; the other terminal 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 terminal of the resistor R1D is connected to the FB1 terminal of the commercial vehicle electronic control MCU and a capacitor C1, and the other terminal of the capacitor C1 is grounded. The second fault diagnosis circuit unit includes a transistor Q2; the first terminal of the transistor Q2 is connected to a resistor R2B, the second terminal of the transistor Q2 is connected to resistors R2A and R2C, and the third terminal of the transistor Q2 is grounded; the other terminal of the resistor R2B is connected to the Control2 terminal of the commercial vehicle electronic control MCU; the other terminal of the resistor R2A is connected to a 24V voltage, the other terminal of the resistor R2C is connected to a resistor R2D, and is also connected to the OUT2 terminal of the first solenoid valve unit; the other terminal of the resistor R2D is connected to the FB2 terminal of the commercial vehicle electronic control MCU and a capacitor C2, and the other terminal of the capacitor C2 is grounded.

4. The circuit control system based on an automotive intelligent chassis according to claim 1, characterized in that, The state of the high-side switch unit is determined based on the logic level of the IN terminal; when the logic level of the IN terminal is high, the high-side switch unit is in a driving state, and when the logic level of the IN terminal is low, the high-side switch unit is in a high-impedance state.

5. The circuit control system based on an automotive intelligent chassis according to claim 1, characterized in that, The diagnostic mode is determined by setting the control terminal state and the high-side switch unit state, thereby determining the diagnostic mode as follows: The diagnostic mode is determined based on the control mode of the MCU control terminal and the logic level of the IN terminal in the commercial vehicle's electronic control unit. When the control mode is high and the logic level of the IN terminal is low, it is the first diagnostic mode; When the control mode is low and the logic level of the IN terminal is low, it is in the second diagnostic mode; When the control mode is low and the logic level of the IN terminal is high, it is the third diagnostic mode.

6. The circuit control system based on an automotive intelligent chassis according to claim 1, characterized in that, The solenoid valve status of the solenoid valve unit includes the normal solenoid valve status, the solenoid valve short-circuited to ground status, the solenoid valve open-circuited status, and the solenoid valve short-circuited to the power supply status.

7. The circuit control system based on an automotive intelligent chassis according to claim 5, characterized in that, The solenoid valve state of the solenoid valve unit is determined by the logic level of the FB terminal. When the voltage at the FB terminal is less than the set minimum threshold, the logic level of the FB terminal is low; when the voltage at 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, the electromagnetic unit is in a short-circuit state to the power supply. Second diagnostic mode: When the FB terminal is high, the electromagnetic unit is in an open circuit state; In the third diagnostic mode: When the level at the FB terminal is high, the electromagnetic unit is in normal state; otherwise, the electromagnetic unit is in a short-circuit state to ground.

8. An electronic control system based on an intelligent automotive chassis, characterized in that, Includes the circuit control system based on an automotive intelligent chassis as described in any one of claims 1-7.

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