Commercial vehicle intelligent chassis electric control APU electromagnetic valve system and control method thereof

Abstract

The invention relates to a solenoid valve fault diagnosis technology, and discloses a commercial vehicle intelligent chassis electric control APU solenoid valve system and a control method thereof, and the commercial vehicle intelligent chassis electric control APU solenoid valve system comprises a first solenoid valve unit, a second solenoid valve unit, a third solenoid valve unit, a fourth solenoid valve unit, a fifth solenoid valve unit and a sixth solenoid valve unit. The first fault diagnosis circuit unit, the second fault diagnosis circuit unit, the high-side switch unit and the commercial vehicle electric control MCU are electrically connected; an electric control MCU of the commercial vehicle controls the levels of Contr0 and IN1, so that FB1 shows different changes in four states of the first electromagnetic valve unit, and the diagnosis of the first electromagnetic valve unit and the state of the first electromagnetic valve unit are recognized; the electric control MCU of the commercial vehicle controls the level of the Contr0 and the level of the IN2, so that the FB2 shows different changes in the four states of the second electromagnetic valve unit, and the diagnosis of the second electromagnetic valve unit and the state of the second electromagnetic valve unit are recognized. The method is simple in diagnosis mode and low in cost.

Description

Technical Field

[0001] The present invention relates to a solenoid valve fault diagnosis technology, and in particular to a commercial vehicle intelligent chassis electronically controlled APU solenoid valve system and a control method thereof. Background Art

[0002] The electronically controlled dryer assembly with an ECU controller has a protective function that greatly extends the dryer's service life. The electronically controlled dryer body is equipped with an unloading solenoid valve and a backflush solenoid valve. Electrical failures may occur in these solenoid valves during use, thus affecting the function of the electronically controlled dryer.

[0003] Prior art 1: CN201610740760.5, an electronically controlled dryer assembly with an ECU controller and a control method.

[0004] For example, prior art 2: CN105549578B, an invention patent published on January 30, 2018, discloses a vehicle solenoid valve fault diagnosis response circuit and its use 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 the prior art, the circuit is complex and the cost is high, and it can only determine whether the solenoid valve has a fault, but cannot determine the specific type of fault.

[0006] A fault can only be detected after the solenoid valve is driven by the integrated chip BTS7236W, that is, a fault can only be detected when the solenoid valve is working. However, the solenoid valve of the electronically controlled APU is not working most of the time, and the timeliness of the existing technical solution is poor.

[0007] Diagnosing each solenoid valve requires four ports: an information output port, a primary control signal output port, a secondary control signal output port, and a voltage input port. Diagnosing two solenoid valves requires eight ports. The electronically controlled APU (Air Processing Unit) adds management of different air paths to the electronically controlled dryer, achieving more precise and efficient air processing, significantly increasing the port resource requirements.

[0008] Electronically controlled APUs primarily use 24V systems, though 12V systems also exist. The solenoid valves used are categorized into two types: 24V and 12V. The resistance of a 24V solenoid valve is approximately 80Ω, while that of a 12V valve is approximately 20Ω. During installation, due to worker negligence, it's possible that these valves were mixed up. Summary of the Invention

[0009] The present invention addresses the problems in the prior art of poor diagnostic timeliness of solenoid valves, the large number of port resources required for diagnosis, and the inability to accurately judge the status of mixed solenoid valve units. A commercial vehicle intelligent chassis electronically controlled APU solenoid valve system and a control method thereof are provided.

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

[0011] A commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method includes a first solenoid valve unit, a second solenoid valve unit, a first fault diagnosis circuit unit, a second fault diagnosis circuit unit, a high-side switch unit and a commercial vehicle electronic control MCU.

[0012] The OUT1 end of the high-side switch unit is connected to the first fault diagnosis circuit unit and the first solenoid valve unit; the OUT2 end of the high-side switch unit is connected to the second fault diagnosis circuit unit and the second solenoid valve unit;

[0013] The FB1 terminal of the commercial vehicle electronic control MCU is connected to the FB1 terminal of the first fault diagnosis circuit unit, and the FB2 terminal of the commercial vehicle electronic control MCU is connected to the FB2 terminal of the second fault diagnosis circuit unit;

[0014] The first fault diagnosis circuit unit and the second fault diagnosis circuit unit are connected to the contr0 terminal of the commercial vehicle electronic control MCU;

[0015] The IN1 and IN2 terminals of the high-side switch unit are connected to the IN1 and IN2 terminals of the commercial vehicle electronic control MCU;

[0016] The control method of the APU solenoid valve of the intelligent chassis of commercial vehicles includes:

[0017] The first solenoid valve unit, the second solenoid valve unit, the first fault diagnosis circuit unit, the second fault diagnosis circuit unit, the high-side switch unit and the commercial vehicle electronic control MCU are electrically connected;

[0018] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 to make FB1 present different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit;

[0019] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 so that FB2 presents different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state.

[0020] As a preference,

[0021] The first fault diagnosis circuit unit includes a resistor R1A, a resistor R1B and a capacitor C1, one end of the resistor R1A is connected to the resistor R1B and the first solenoid valve unit, and is connected to the OUT1 end of the high-side switch unit;

[0022] The other end of the resistor R1B is connected to the capacitor C1 and the FB1 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C1 is grounded;

[0023] The second fault diagnosis circuit unit includes a resistor R2A, a resistor R2B and a capacitor C2, one end of the resistor R2A is connected to the resistor R2B, the second solenoid valve unit and the OUT2 end of the high-side switch unit;

[0024] The other end of the resistor R2B is connected to the capacitor C2 and the FB2 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C2 is grounded;

[0025] The other end of the resistor R1A is connected to the resistor R0A and the transistor Q0, and the connection point is A; the first end of the transistor Q0 is connected to the resistor R1A and the resistor R0A, the second end of the transistor Q0 is connected to the resistor R0B, and the third end of the transistor Q0 is grounded

[0026] The other end of the resistor R0A is connected to the 24V voltage, and the other end of the resistor R0B is connected to the Contr0 terminal of the commercial vehicle electronic control MCU.

[0027] Preferably, the commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 so that FB1 presents different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit;

[0028] When Contr0=0, IN1=0, and the first solenoid valve unit is in normal state, FB1 is low level,

[0029] When the voltage U FB1 When it is within the range of U11, the second solenoid valve unit is in normal state.

[0030] When the voltage U FB1 When it is within the range of U12, the second solenoid valve unit is in a short-circuit state to the ground.

[0031] When the voltage U FB1 When the voltage U13 is within the range of U13, the second solenoid valve unit is in the open circuit state. FB1 When it is within the range of U14, the second solenoid valve unit is in a short-circuit state to the power supply;

[0032] When IN1=0 and FB1 is high,

[0033] When the voltage U FB1 When it is within the range of U15, the second solenoid valve unit is in normal state.

[0034] When the voltage U FB1 When it is within the range of U16, the second solenoid valve unit is short-circuited to the ground.

[0035] When the voltage U FB1 When the voltage U17 is within the range of U17, the second solenoid valve unit is in the open circuit state. FB1 When it is within the range of U18, the second solenoid valve unit is in a short-circuit state to the power supply;

[0036] When Contr0=1,IN1=0,and FB1 is low level,

[0037] When the voltage U FB1 When it is within the range of U19, the second solenoid valve unit is in normal state, short circuit state to ground or open circuit state.

[0038] When the voltage U FB1 U1 10 When the second solenoid valve unit is within the range, the second solenoid valve unit is in a short-circuit state to the power supply;

[0039] When IN1=0 and FB1 is high,

[0040] When the voltage U FB1 U1 11 When the second solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state,

[0041] When the voltage U FB1 U1 12 When the voltage is within the range, the second solenoid valve unit is in a short-circuit state to the power supply.

[0042] As a preference,

[0043] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 to make FB2 show different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state;

[0044] When Contr0=0,IN2=0,and FB2 is low level,

[0045] When the voltage U FB2 When it is within the range of U21, the first solenoid valve unit is in normal state.

[0046] When the voltage U FB2When it is within the range of U22, the first solenoid valve unit is in a short-circuit state to the ground.

[0047] When the voltage U FB2 When the voltage U23 is within the range, the first solenoid valve unit is in the open circuit state. FB1 When it is within the range of U24, the first solenoid valve unit is in a short-circuit state to the power supply;

[0048] When IN2=0 and FB2 is high,

[0049] When the voltage U FB2 When it is within the range of U25, the first solenoid valve unit is in normal state.

[0050] When the voltage U FB2 When it is within the range of U26, the first solenoid valve unit is in a short-circuit state to the ground.

[0051] When the voltage U FB2 When the voltage U27 is within the range of U27, the first solenoid valve unit is in the open circuit state. FB2 When it is within the range of U28, the first solenoid valve unit is in a short-circuit state to the power supply;

[0052] When Contr0=1,IN2=0,and FB2 is low level,

[0053] When the voltage U FB2 When it is within the range of U29, the first solenoid valve unit is in normal state, short circuit state to ground or open circuit state.

[0054] When the voltage U FB2 for U2 10 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply;

[0055] When IN2=0 and FB2 is high,

[0056] When the voltage U FB2 for U2 11 When the first solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state,

[0057] When the voltage U FB2 for U2 12 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply.

[0058] Preferably, the resistance values of the resistors R0A, R1A, R1B, R2A, R0B, and R1B are much greater than the resistance values of the first solenoid valve unit and the second solenoid valve unit.

[0059] In order to solve the above technical problems, the present invention also provides a commercial vehicle intelligent chassis electronically controlled APU solenoid valve system, which is used to implement the commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method.

[0060] The present invention has significant technical effects due to the adoption of the above technical solutions:

[0061] The electromagnetic valve fault diagnosis system of the present invention requires few electromagnetic valve diagnosis port resources and is simple in design, and can determine the fault state of the electromagnetic valve in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a circuit diagram of the present invention.

[0063] Figure 2 This is a circuit diagram for diagnosing a solenoid valve fault with a clear resistance value according to the present invention.

[0064] Figure 3 This is the equivalent circuit diagram of the diagnostic part when Contr0 is 0 in the present invention.

[0065] Figure 4 This is a simulation test diagram of state mode 1 when Contr0 is 0 according to the present invention.

[0066] Figure 5 This is a simulation test diagram of state mode 2 when Contr0 is 0 according to the present invention.

[0067] Figure 6 This is a simulation test diagram of state mode 3 when Contr0 is 0 according to the present invention.

[0068] Figure 7 This is a simulation test diagram of state mode 4 when Contr0 is 0 according to the present invention.

[0069] Figure 8 This is a simulation test diagram of state mode 9 when Contr0 is 0 according to the present invention.

[0070] Figure 9 This is a simulation test diagram of state mode 10 when Contr0 is 0 according to the present invention.

[0071] Figure 10 This is a simulation test diagram of state mode 11 when Contr0 is 0 according to the present invention.

[0072] Figure 11 This is a simulation test diagram of state mode 12 when Contr0 is 0 according to the present invention.

[0073] Figure 12 This is a simulation test diagram of state mode 1 when Contr0 is 1 according to the present invention.

[0074] Figure 13 This is a simulation test diagram of state mode 2 when Contr0 is 1 according to the present invention.

[0075] Figure 14 This is a simulation test diagram of state mode 3 when Contr0 is 1 according to the present invention.

[0076] Figure 15 This is a simulation test diagram of state mode 4 when Contr0 is 1 according to the present invention.

[0077] Figure 16 This is a simulation test diagram of state mode 9 when Contr0 is 1 according to the present invention.

[0078] Figure 17 This is a simulation test diagram of state mode 10 when Contr0 is 1 according to the present invention.

[0079] Figure 18 This is a simulation test diagram of state mode 11 when Contr0 is 1 according to the present invention.

[0080] Figure 19 This is a simulation test diagram of state mode 12 when Contr0 is 1 according to the present invention.

[0081] Figure 20 This is the process of the present invention. DETAILED DESCRIPTION

[0082] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0083] Example 1

[0084] A commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method includes a first solenoid valve unit, a second solenoid valve unit, a first fault diagnosis circuit unit, a second fault diagnosis circuit unit, a high-side switch unit and a commercial vehicle electronic control MCU.

[0085] The OUT1 end of the high-side switch unit is connected to the first fault diagnosis circuit unit and the first solenoid valve unit; the OUT2 end of the high-side switch unit is connected to the second fault diagnosis circuit unit and the second solenoid valve unit;

[0086] The FB1 terminal of the commercial vehicle electronic control MCU is connected to the FB1 terminal of the first fault diagnosis circuit unit, and the FB2 terminal of the commercial vehicle electronic control MCU is connected to the FB2 terminal of the second fault diagnosis circuit unit;

[0087] The first fault diagnosis circuit unit and the second fault diagnosis circuit unit are connected to the contr0 terminal of the commercial vehicle electronic control MCU;

[0088] The IN1 and IN2 terminals of the high-side switch unit are connected to the IN1 and IN2 terminals of the commercial vehicle electronic control MCU;

[0089] The control method of the APU solenoid valve of the intelligent chassis of commercial vehicles includes:

[0090] The first solenoid valve unit, the second solenoid valve unit, the first fault diagnosis circuit unit, the second fault diagnosis circuit unit, the high-side switch unit and the commercial vehicle electronic control MCU are electrically connected;

[0091] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 to make FB1 present different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit;

[0092] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 so that FB2 presents different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state.

[0093] The first fault diagnosis circuit unit includes a resistor R1A, a resistor R1B and a capacitor C1, one end of the resistor R1A is connected to the resistor R1B and the first solenoid valve unit, and is connected to the OUT1 end of the high-side switch unit;

[0094] The other end of the resistor R1B is connected to the capacitor C1 and the FB1 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C1 is grounded;

[0095] The second fault diagnosis circuit unit includes a resistor R2A, a resistor R2B and a capacitor C2, one end of the resistor R2A is connected to the resistor R2B, the second solenoid valve unit and the OUT2 end of the high-side switch unit;

[0096] The other end of the resistor R2B is connected to the capacitor C2 and the FB2 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C2 is grounded;

[0097] The other end of the resistor R1A is connected to the resistor R0A and the transistor Q0, and the connection point is A; the first end of the transistor Q0 is connected to the resistor R1A and the resistor R0A, the second end of the transistor Q0 is connected to the resistor R0B, and the third end of the transistor Q0 is grounded;

[0098] The other end of the resistor R0A is connected to the 24V voltage, and the other end of the resistor R0B is connected to the Contr0 terminal of the commercial vehicle electronic control MCU.

[0099] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 so that FB1 presents different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit;

[0100] When Contr0=0,IN1=0,and FB1 is low level,

[0101] When the voltage U FB1 When it is within the range of U11, the second solenoid valve unit is in normal state.

[0102] When the voltage U FB1 When it is within the range of U12, the second solenoid valve unit is in a short-circuit state to the ground.

[0103] When the voltage U FB1 When the voltage U13 is within the range of U13, the second solenoid valve unit is in the open circuit state. FB1 When it is within the range of U14, the second solenoid valve unit is in a short-circuit state to the power supply;

[0104] When IN1=0 and FB1 is high,

[0105] When the voltage U FB1 When it is within the range of U15, the second solenoid valve unit is in normal state.

[0106] When the voltage U FB1 When it is within the range of U16, the second solenoid valve unit is short-circuited to the ground.

[0107] When the voltage U FB1 When the voltage U17 is within the range of U17, the second solenoid valve unit is in the open circuit state. FB1 When it is within the range of U18, the second solenoid valve unit is in a short-circuit state to the power supply;

[0108] When Contr0=1,IN1=0,and FB1 is low level,

[0109] When the voltage U FB1 When it is within the range of U19, the second solenoid valve unit is in normal state, short circuit state to ground or open circuit state.

[0110] When the voltage U FB1 U1 10 When the second solenoid valve unit is within the range, the second solenoid valve unit is in a short-circuit state to the power supply;

[0111] When IN1=0 and FB1 is high,

[0112] When the voltage UFB1 U1 11 When the second solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state,

[0113] When the voltage U FB1 U1 12 When the voltage is within the range, the second solenoid valve unit is in a short-circuit state to the power supply.

[0114] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 to make FB2 show different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state;

[0115] When Contr0=0,IN2=0,and FB2 is low level,

[0116] When the voltage U FB2 When it is within the range of U21, the first solenoid valve unit is in normal state.

[0117] When the voltage U FB2 When it is within the range of U22, the first solenoid valve unit is in a short-circuit state to the ground.

[0118] When the voltage U FB2 When the voltage U23 is within the range, the first solenoid valve unit is in the open circuit state. FB1 When it is within the range of U24, the first solenoid valve unit is in a short-circuit state to the power supply;

[0119] When IN2=0, and the second solenoid valve unit is in open circuit state, FB2 is high level,

[0120] When the voltage U FB2 When it is within the range of U25, the first solenoid valve unit is in normal state.

[0121] When the voltage U FB2 When it is within the range of U26, the first solenoid valve unit is in a short-circuit state to the ground.

[0122] When the voltage U FB2 When the voltage U27 is within the range of U27, the first solenoid valve unit is in the open circuit state. FB2 When it is within the range of U28, the first solenoid valve unit is in a short-circuit state to the power supply;

[0123] When Contr0=1,IN2=0,and FB2 is low level,

[0124] When the voltage U FB2When it is within the range of U29, the first solenoid valve unit is in normal state, short circuit state to ground or open circuit state.

[0125] When the voltage U FB2 for U2 10 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply;

[0126] When IN2=0 and FB2 is high,

[0127] When the voltage U FB2 for U2 11 When the first solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state,

[0128] When the voltage U FB2 for U2 12 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply.

[0129] The resistance values of the resistors R0A, R1A, R1B, R2A, R0B, and R1B are much greater than the resistance values of the first solenoid valve unit and the second solenoid valve unit.

[0130] Example 2

[0131] In this embodiment, resistors R0A, R1A, R1B, R2A, and R2B primarily serve to limit current. Resistor R0A and transistor Q0 form a switching circuit that controls the voltage at point A. Capacitors C1 and C2 serve as filter capacitors. U9 is a high-side switch, IN1 is the common output port of the MCU. When IN1=1, the high-side switch OUT1 port outputs 24V, which is also called the unloading solenoid valve driving state. When IN1=0, the high-side switch OUT1 port outputs a high-impedance state. IN2 is the common output port of the commercial vehicle electronic control MCU. When IN2=1, the high-side switch OUT1 port outputs 24V, which is also called the back-blowing solenoid valve driving state. When IN2=0, the high-side switch OUT1 port outputs a high-impedance state. Contr0 is the common output port of the commercial vehicle electronic control MCU. When Contr0=1, the transistor Q0 is turned on and grounded, and the power supply at point A is 0V. When Contr0=0, the transistor Q0 is cut off, and the transistor outputs a high-impedance state. FB1 is the common input port of the commercial vehicle electronic control MCU. When the FB1 input voltage is ≤1V, the commercial vehicle electronic control MCU recognizes it as logic level 0. When the FB1 input voltage is ≥4V, the commercial vehicle electronic control MCU recognizes it as logic level 1. FB2 is the common input port of the commercial vehicle electronic control MCU. When the FB2 input voltage is ≤1V, the commercial vehicle electronic control MCU recognizes it as logic level 0. When the FB2 input voltage is ≥4V, the commercial vehicle electronic control MCU recognizes it as logic level 1.

[0132] The high-side switch has short-circuit protection. When IN1 = 1, the high-side switch OUT1 outputs 24V. If OUT1 is short-circuited to ground at this time, the high-side switch's short-circuit protection function will be triggered, disconnecting the 24V output. Therefore, during a short circuit, the voltage on OUT1 remains at 0V. When IN1 = 2, the high-side switch OUT2 outputs 24V. If OUT2 is short-circuited to ground at this time, the high-side switch's short-circuit protection function will be triggered, disconnecting the 24V output. Therefore, during a short circuit, the voltage on OUT2 remains at 0V.

[0133] The solenoid valves used in electronically controlled APUs must have sufficient power to operate. A 24V solenoid valve has a resistance of approximately 80Ω, and a voltage of 16V or higher must be applied directly to the solenoid valve to activate and control the air path. In this solution, 24V is connected to the solenoid valve through a resistor. If the resistance is small enough, the solenoid valve will operate. Therefore, during the design, the resistors R0A, R1A, R1B, R2A, and R2B cannot be of different sizes. Assuming a 24V system, for a more intuitive understanding of this solution, the resistors R1A = R2A = R1A = R2B = 51KΩ, the resistor R0A = 33KΩ, and the resistor R0B = 10KΩ are set.

[0134] The diagnostic solenoid valve has four states: normal, short-circuited to ground, open-circuited, and short-circuited to power. The first solenoid valve unit is the unloading solenoid valve, and the second solenoid valve unit is the blowback solenoid valve. The unloading solenoid valve's short-circuited to ground state means the OUT1 port is short-circuited to ground, and the OUT1 port voltage is 0V. The unloading solenoid valve's open-circuited and short-circuited state means the connection between the OUT1 port and the unloading solenoid valve is disconnected. The unloading solenoid valve's short-circuited to power state means the OUT1 port is short-circuited to the system power supply, and the OUT1 port voltage is 24V. The blowback solenoid valve's short-circuited to ground state means the OUT2 port is short-circuited to ground, and the OUT2 port voltage is 0V. The blowback solenoid valve's open-circuited and short-circuited state means the connection between the OUT2 port and the unloading solenoid valve is disconnected. The blowback solenoid valve's short-circuited to power state means the OUT2 port is short-circuited to the system power supply, and the OUT2 port voltage is 24V.

[0135] The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 to make FB1 show different changes in the four states of the unloading solenoid valve, thereby identifying the diagnostic state of the unloading solenoid valve; the MCU controls the levels of Contr0 and IN2 to make FB2 show different changes in the four states of the unloading solenoid valve, thereby identifying the diagnostic state of the backflush solenoid valve.

[0136] The logic level change of FB1 is key to diagnosing the unloading solenoid valve's status. When identifying the unloading solenoid valve's status, do the four diagnostic states and actuation state of the blowback solenoid valve affect the unloading solenoid valve's diagnostic status? This can be determined through calculation or simulation.

[0137] When the unloading solenoid valve is in the short-circuit state or the driven state, the voltage at OUT1 is 24V. Therefore, they can be classified into the same category when determining whether they affect the logic level change of FB1. When the blowback solenoid valve is in the short-circuit state or the driven state, the voltage at OUT2 is 24V. Therefore, they can be classified into the same category when determining whether they affect the logic level change of FB1. Table 1 lists the impacts of the blowback solenoid valve state on the unloading solenoid valve.

[0138] Table 1 List of influences of unloading solenoid valve on back-blowing solenoid valve status

[0139]

[0140] Next, we will improve Table 1 by dividing it into two cases: Contr0=0 and Contr0=1.

[0141] Case 1: Contr0 = 0; Figure 3 In the figure, when the unloading solenoid valve is in the short-circuit state, the voltage on OUT1 is 0V. The voltage change on OUT2 will not affect the voltage on OUT1. The voltage on OUT1 is directly transmitted to FB1 through resistor R1B. FB1 is always 0V, and the FB1 logic level is always 0. Therefore, the "FB1 voltage" corresponding to state modes 5 to 8 in Table 1 are all filled with 0V, and the "FB1 logic level" is all filled with 0.

[0142] When the unloading solenoid valve is short-circuited to the power supply or IN1 = 1, the voltage on OUT1 is 24V. The voltage change on OUT2 will not affect the voltage on OUT1. The voltage on OUT1 is directly transmitted to FB1 through resistor R1B. FB1 is always 24V, and the FB1 logic level is always 1. Therefore, the "FB1 voltage" corresponding to status modes 13 to 16 in Table 1 are all filled with 24V, and the "FB1 logic level" is all filled with 1.

[0143] according to Figure 4 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 1 in Table 1 is filled with 16.4mV and the "FB1 logic level" is filled with 0.

[0144] according to Figure 5 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 2 in Table 1 is filled with 16.4mV and the "FB1 logic level" is filled with 0.

[0145] according to Figure 6Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 3 in Table 1 is filled with 22.8mV and the "FB1 logic level" is filled with 0.

[0146] according to Figure 7 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 2 in Table 1 is filled with 27.0mV and the "FB1 logic level" is filled with 0.

[0147] according to Figure 8 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 9 in Table 1 is filled with 14.6V and the "FB1 logic level" is filled with 1.

[0148] according to Figure 9 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 10 in Table 1 is filled with 14.6V and the "FB1 logic level" is filled with 1.

[0149] according to Figure 10 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 11 in Table 1 is filled with 24.0V and the "FB1 logic level" is filled with 1.

[0150] according to Figure 11 Through simulation tests, it can be determined that the "FB1 voltage" corresponding to state mode 12 in Table 1 is filled with 24.0V and the "FB1 logic level" is filled with 1. In summary, Table 2 is obtained.

[0151] Table 2: Status table of the unloading solenoid valve affected by the back-blowing solenoid valve when Contr0=0

[0152]

[0153] As can be seen from Table 2,

[0154] When Contr0=0, IN1=0, the unloading solenoid valve is in normal state, and the blowback solenoid valve is in any state, the FB1 logic level is equal to 0;

[0155] When Contr0=0, IN1=0, the unloading solenoid valve is in a short-circuit state to the ground, and the blowback solenoid valve is in any state, the FB1 logic level is equal to 0;

[0156] When Contr0=0, IN1=0, the unloading solenoid valve is in the open circuit state, and the blowback solenoid valve is in any state, the FB1 logic level is equal to 1;

[0157] When Contr0=0, IN1=0, the unloading solenoid valve is in the short-circuit state to the power supply, and the blowback solenoid valve is in any state, the FB1 logic level is equal to 1;

[0158] When Contr0=0, IN1=1, the unloading solenoid valve is in the driving state, and the blowback solenoid valve is in any state, the FB1 logic level is equal to 1;

[0159] In summary, we get Table 3, see the table below

[0160] Table 3 Unloading solenoid valve status table when Contr0=0

[0161] State Pattern Unloading solenoid valve status FB1 logic level Remark 1 normal 0 IN1=0 2 Short circuit to ground 0 IN1=0 3 open circuit 1 IN1=0 4 Short circuit to power supply 1 IN1=0 5 drive 1 IN1=1

[0162] Case 2: Contr0 = 1

[0163] When the unloading solenoid valve is short-circuited to ground, the voltage on OUT1 is 0V. Changes in the voltage on OUT2 will not affect the voltage on OUT1. The voltage on OUT1 is directly transmitted to FB1 through resistor R1B. FB1 is always 0V, and the FB1 logic level is always 0. Therefore, the "FB1 voltage" corresponding to status modes 5 to 8 in Table 1 are all filled with 0V, and the "FB1 logic level" is all filled with 0.

[0164] When the unloading solenoid valve is short-circuited to the power supply or IN1 = 1, the voltage on OUT1 is 24V. The voltage change on OUT2 will not affect the voltage on OUT1. The voltage on OUT1 is directly transmitted to FB1 through resistor R1B. FB1 is always 24V, and the FB1 logic level is always 1. Therefore, the "FB1 voltage" corresponding to status modes 13 to 16 in Table 1 are all filled with 24V, and the "FB1 logic level" is all filled with 1.

[0165] Table 4: Status table of the unloading solenoid valve affected by the back-blowing solenoid valve when Contr0=1

[0166]

[0167]

[0168] It can be seen from Table 4 that when Contr0=1, IN1=0, the unloading solenoid valve is in the normal state, and the back-blowing solenoid valve is in any state, the FB1 logic level is equal to 0; when Contr0=1, IN1=0, the unloading solenoid valve is in the short-circuit state to the ground, and the back-blowing solenoid valve is in any state, the FB1 logic level is equal to 0; when Contr0=1, IN1=0, the unloading solenoid valve is in the open-circuit state, and the back-blowing solenoid valve is in any state, the FB1 logic level is equal to 0; when Contr0=1, IN1=0, the unloading solenoid valve is in the short-circuit state to the power supply, and the back-blowing solenoid valve is in any state, the FB1 logic level is equal to 1; when Contr0=1, IN1=1, the unloading solenoid valve is in the driving state, and the back-blowing solenoid valve is in any state, the FB1 logic level is equal to 1; Based on the above, Table 5 is obtained, see the table below

[0169] Table 5 Unloading solenoid valve status table when Contr0=1

[0170]

[0171]

[0172] 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 high-side switch's short-circuit protection function will be triggered, disconnecting the 24V output. Therefore, during a short circuit, the voltage on OUT1 is always 0V. Based on the above (mainly Table 3 and Table 5), the following control logic is proposed, as shown in Table 6:

[0173] Table 6 Unloading solenoid valve control logic table

[0174]

[0175] Example 3

[0176] Based on the above embodiment, this embodiment is a commercial vehicle intelligent chassis electronically controlled APU solenoid valve system, which is used to implement the commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method.

Claims

1. A commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method, comprising a first solenoid valve unit, a second solenoid valve unit, a first fault diagnosis circuit unit, a second fault diagnosis circuit unit, a high-side switch unit, and a commercial vehicle electronic control MCU. The OUT1 end of the high-side switch unit is connected to the first fault diagnosis circuit unit and the first solenoid valve unit; the OUT2 end of the high-side switch unit is connected to the second fault diagnosis circuit unit and the second solenoid valve unit; The FB1 terminal of the commercial vehicle electronic control MCU is connected to the FB1 terminal of the first fault diagnosis circuit unit, and the FB2 terminal of the commercial vehicle electronic control MCU is connected to the FB2 terminal of the second fault diagnosis circuit unit; The first fault diagnosis circuit unit and the second fault diagnosis circuit unit are connected to the contr0 terminal of the commercial vehicle electronic control MCU; The IN1 and IN2 terminals of the high-side switch unit are connected to the IN1 and IN2 terminals of the commercial vehicle electronic control MCU; The control method of the solenoid valve of the electronically controlled APU of the intelligent chassis of commercial vehicles includes: The first solenoid valve unit, the second solenoid valve unit, the first fault diagnosis circuit unit, the second fault diagnosis circuit unit, the high-side switch unit and the commercial vehicle electronic control MCU are electrically connected; The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 to make FB1 present different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit; The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 so that FB2 presents different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state.

2. The method for controlling the solenoid valve of the electronically controlled APU of a commercial vehicle intelligent chassis according to claim 1, characterized in that: The first fault diagnosis circuit unit includes a resistor R1A, a resistor R1B and a capacitor C1, one end of the resistor R1A is connected to the resistor R1B and the first solenoid valve unit, and is connected to the OUT1 end of the high-side switch unit; The other end of the resistor R1B is connected to the capacitor C1 and the FB1 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C1 is grounded; The second fault diagnosis circuit unit includes a resistor R2A, a resistor R2B and a capacitor C2, one end of the resistor R2A is connected to the resistor R2B, the second solenoid valve unit and the OUT2 end of the high-side switch unit; The other end of the resistor R2B is connected to the capacitor C2 and the FB2 terminal of the commercial vehicle electronic control MCU; the other end of the capacitor C2 is grounded; The other end of the resistor R1A is connected to the resistor R0A and the transistor Q0, and the connection point is A; the first end of the transistor Q0 is connected to the resistor R1A and the resistor R0A, the second end of the transistor Q0 is connected to the resistor R0B, and the third end of the transistor Q0 is grounded The other end of the resistor R0A is connected to the 24V voltage, and the other end of the resistor R0B is connected to the Contr0 terminal of the commercial vehicle electronic control MCU.

3. The method for controlling the solenoid valve of the electronically controlled APU of a commercial vehicle intelligent chassis according to claim 1, characterized in that: The commercial vehicle electronic control MCU controls the levels of Contr0 and IN1 so that FB1 presents different changes in the four states of the first solenoid valve unit, thereby identifying the diagnosis of the first solenoid valve unit and the state of the first solenoid valve unit; When Contr0=0,IN1=0,and FB1 is low level, When the voltage U FB1 When it is within the range of U11, the second solenoid valve unit is in normal state. When the voltage U FB1 When it is within the range of U12, the second solenoid valve unit is in a short-circuit state to the ground. When the voltage U FB1 When it is within the range of U13, the second solenoid valve unit is in open circuit state. When the voltage U FB1 When it is within the range of U14, the second solenoid valve unit is in a short-circuit state to the power supply; When IN1=0 and FB1 is high, When the voltage U FB1 When it is within the range of U15, the second solenoid valve unit is in normal state. When the voltage U FB1 When it is within the range of U16, the second solenoid valve unit is short-circuited to the ground. When the voltage U FB1 When it is within the range of U17, the second solenoid valve unit is in open circuit state. When the voltage U FB1 When it is within the range of U18, the second solenoid valve unit is in a short-circuit state to the power supply; When Contr0=1,IN1=0,and FB1 is low level, When the voltage U FB1 When it is within the range of U19, the second solenoid valve unit is in normal state, short circuit state to ground or open circuit state. When the voltage U FB1 U1 10 When the second solenoid valve unit is within the range, the second solenoid valve unit is in a short-circuit state to the power supply; When IN1=0, and the first solenoid valve unit is in a short-circuit state to the power supply, FB1 is high level, When the voltage U FB1 U1 11 When the second solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state, When the voltage U FB1 U1 12 When the voltage is within the range, the second solenoid valve unit is in a short-circuit state to the power supply.

4. The method for controlling the solenoid valve of the electronically controlled APU of a commercial vehicle intelligent chassis according to claim 1, characterized in that: The commercial vehicle electronic control MCU controls the levels of Contr0 and IN2 to make FB2 show different changes in the four states of the second solenoid valve unit, thereby identifying the second solenoid valve unit diagnosis and the second solenoid valve unit state; When Contr0=0,IN2=0,and FB2 is low level, When the voltage U FB2 When it is within the range of U21, the first solenoid valve unit is in normal state. When the voltage U FB2 When it is within the range of U22, the first solenoid valve unit is in a short-circuit state to the ground. When the voltage U FB2 When it is within the range of U23, the first solenoid valve unit is in open circuit state. When the voltage U FB1 When it is within the range of U24, the first solenoid valve unit is in a short-circuit state to the power supply; When IN2=0 and FB2 is high, When the voltage U FB2 When it is within the range of U25, the first solenoid valve unit is in normal state. When the voltage U FB2 When it is within the range of U26, the first solenoid valve unit is in a short-circuit state to the ground. When the voltage U FB2 When it is within the range of U27, the first solenoid valve unit is in open circuit state. When the voltage U FB2 When it is within the range of U28, the first solenoid valve unit is in a short-circuit state to the power supply; When Contr0=1,IN2=0,and FB2 is low level, When the voltage U FB2 When it is within the range of U29, the first solenoid valve unit is in normal state, short circuit state to ground or open circuit state. When the voltage U FB2 for U2 10 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply; When IN2=0 and FB2 is high, When the voltage U FB2 for U2 11 When the first solenoid valve unit is in a normal state, a short circuit state to ground or an open circuit state, When the voltage U FB2 for U2 12 When the voltage is within the range, the first solenoid valve unit is in a short-circuit state to the power supply.

5. The method for controlling the solenoid valve of the electronically controlled APU of a commercial vehicle intelligent chassis according to claim 1, characterized in that: The resistance values of the resistors R0A, R1A, R1B, R2A, R0B, and R1B are much greater than the resistance values of the first solenoid valve unit and the second solenoid valve unit.

6. A commercial vehicle intelligent chassis electronically controlled APU solenoid valve system, characterized in that: Used to implement a commercial vehicle intelligent chassis electronically controlled APU solenoid valve control method as described in any one of claims 1-5.

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