A self-diagnosis control system for internal combustion forklift

Abstract

The present invention relates to a self-diagnosis control system for an internal combustion forklift, comprising a battery B, the battery B supplies power to an engine controller ECU, an electronically controlled transmission controller TCU, a self-diagnosis intelligent instrument, a direction gear unit, and a fingertip operation unit respectively, and the engine controller ECU, the electronically controlled transmission controller TCU, the self-diagnosis intelligent instrument, the direction gear unit, and the fingertip operation unit communicate with each other through a CAN bus. The engine controller ECU and the self-diagnosis intelligent instrument of the present invention can easily determine whether the bus connection is smooth or not, and even if the on-site personnel are not familiar with the bus, they can easily solve the problem; the on-site personnel can directly determine the correct connection or fault point of the direction switch through the direction switch self-diagnosis chart in the self-diagnosis intelligent instrument, without the need for maintenance tools for detection, thereby reducing maintenance time.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion forklifts, in particular to a self-diagnosis control system for internal combustion forklifts. Background Art

[0002] With the development of the internal combustion forklift industry and the upgrade of emissions, the number of electrical components used in forklifts has also increased, and the control has become increasingly complex. Real-time data exchange is required between the electronic control units. At the same time, customers have put forward new requirements for vehicle safety and comfort. Traditional connections mostly use a single point-to-point communication method with little contact between each other. Therefore, in order to meet the needs, traditional connections will cause a huge wiring system. At the same time, in order to improve the communication speed and information exchange between the electronic control units and reduce the failure rate, more and more bus technologies are used on internal combustion forklifts. At the same time, the CAN bus network is the most widely used high-speed vehicle communication network due to its stable communication and low cost. At present, the commonly used CAN bus communications for internal combustion forklifts are mainly: between the engine controller ECU and the instrument, between the engine controller ECU and the post-processing controller DCU, between the engine controller ECU and the electronic transmission controller TCU, etc.

[0003] A large number of CAN buses are used in internal combustion forklifts, which facilitates the control of components or the entire machine. However, when a fault occurs during application or the status of a component needs to be understood, it is impossible to do so due to the lack of professional bus diagnostic tools or personnel who do not understand bus technology. Users spend a lot of time at their site but cannot find the fault. They can only eliminate the fault by replacing components one by one. Summary of the invention

[0004] The object of the present invention is to provide a self-diagnosis control system for an internal combustion forklift that can help on-site personnel solve problems, reduce forklift maintenance time, and improve the work efficiency of maintenance personnel.

[0005] To achieve the above object, the present invention adopts the following technical solution: a self-diagnosis control system for an internal combustion forklift, comprising:

[0006] Battery B is used to start the forklift power supply, to supply power to the whole machine parts before the forklift is started, and to supply power to the electrical components when the generator cannot supply power after the whole machine is started;

[0007] The start switch is divided into ON position and start position. The ON position cuts off or connects the power supply of electrical components, and the start position starts the forklift;

[0008] The engine controller ECU is used to control the engine. When the engine is running, the engine controller ECU collects water temperature sensor parameters, fuel sensor parameters, start-on gear parameters, oil pressure sensor signals and camshaft speed signals for calculation, and converts the calculation results into control signals to control the engine. At the same time, the engine controller ECU also has information transmission, fault diagnosis and protection functions;

[0009] The electronically controlled transmission controller TCU is used for forklift transmission control. It collects transmission oil temperature sensor parameters, start-up ON gear parameters, pump wheel speed signal and transmission output shaft speed signal for calculation, and then automatically controls transmission reversing and automatic shifting. At the same time, the electronically controlled transmission controller TCU also has information transmission, fault diagnosis and protection functions;

[0010] Self-diagnostic intelligent instrument collects the oil level and CAN bus data signals of the forklift, and displays and alarms according to the collected data to remind the driver to drive the forklift safely;

[0011] The direction and gear unit is used for the forklift's reversing and gear shifting operations, and uploads the direction and gear position signals to the vehicle bus;

[0012] Fingertip operating unit, used to operate the lifting system of the forklift to complete the cargo loading and unloading of the forklift;

[0013] Battery B supplies power to the engine controller ECU, the electronic transmission controller TCU, the self-diagnosis intelligent instrument, the steering gear unit, and the fingertip operation unit respectively. The engine controller ECU, the electronic transmission controller TCU, the self-diagnosis intelligent instrument, the steering gear unit, and the fingertip operation unit communicate with each other through the CAN bus;

[0014] The engine controller ECU includes a first single-chip microcomputer, a first bus module and a first step-down module, the electronically controlled transmission controller TCU includes a second single-chip microcomputer, a second bus module and a second step-down module, the self-diagnosis intelligent instrument includes a third single-chip microcomputer, a third bus module, a third step-down module, a buzzer, a fault indicator light and a liquid crystal display screen, the direction gear unit includes a fourth single-chip microcomputer, a fourth bus module, a fourth step-down module and a direction gear, the direction gear includes a forward gear F for controlling the forklift to move forward, a neutral gear N for starting the forklift in neutral, a reverse gear R for controlling the forklift to move backward, a 1st gear, a 2nd gear and a 3rd gear; the fingertip operation unit includes a fifth bus module, a fifth step-down module and a fingertip switch.

[0015] The positive electrode of the battery B is connected to the power input end of the first step-down module through the third fuse F3, the positive electrode of the battery B is connected to the signal input detection control port of the first single-chip microcomputer through the start switch ON gear and the second fuse F2 in sequence, the positive electrode of the battery B is connected to the start signal detection port of the first single-chip microcomputer through the start switch start gear, the first single-chip microcomputer communicates with the first bus module in a two-way manner, the power output end of the first step-down module is respectively connected to the power input end of the first single-chip microcomputer and the first bus module; the signal input end of the first single-chip microcomputer collects the start signal, water temperature parameter, start switch signal and oil pressure signal;

[0016] The positive electrode of the battery B is connected to the power input end of the second step-down module through the fifth fuse F5, and the positive electrode of the battery B is connected to the signal input detection port of the second single-chip microcomputer through the start switch ON gear and the fourth fuse F4 in sequence. The second single-chip microcomputer communicates with the second bus module in a two-way manner, and the power output end of the second step-down module is respectively connected to the power input end of the second single-chip microcomputer and the second bus module; the signal input end of the second single-chip microcomputer collects the gearbox oil temperature signal, the gearbox resistance switch signal, the pump wheel and the vehicle speed signal;

[0017] The positive electrode of the battery B is connected to the power input end of the third step-down module through the start switch ON gear and the seventh fuse F7 in sequence, the power output end of the second step-down module is connected to the power input end of the third single-chip microcomputer and the third bus module respectively, the third single-chip microcomputer communicates with the third bus module bidirectionally, and the output end of the third single-chip microcomputer is connected to the input end of the buzzer Q, the fault indicator light L1, and the liquid crystal display screen respectively;

[0018] The positive electrode of the battery B is connected to the power input end of the fourth step-down module through the start switch ON gear and the first fuse F1 in sequence, the power output end of the fourth step-down module is connected to the power input end of the fourth single-chip computer and the fourth bus module respectively, the fourth single-chip computer and the fourth bus module communicate bidirectionally, the direction gear is connected between the fourth step-down module and the fourth single-chip computer, one end of each gear switch of the direction gear is connected to the power input end of the fourth step-down module, and the other end of the direction gear is connected to the signal input detection port of the fourth single-chip computer;

[0019] The positive electrode of the battery B is connected to the power input end of the fifth step-down module through the start switch ON gear and the sixth fuse F6 in sequence. The power output end of the fifth step-down module is respectively connected to the fifth bus module and the power input end of the fingertip switch. The fingertip switch signal is connected to the fifth bus module. The fingertip switch inputs the fingertip analog signal to the fifth bus module. The fifth bus module converts the fingertip analog signal into a bus signal and uploads the converted bus signal to the vehicle bus.

[0020] The first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module communicate with each other via the CAN bus; the first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module all use the TAJ1050 chip.

[0021] The first single-chip microcomputer and the second single-chip microcomputer both use MC9S12XS128MAL chips; the third single-chip microcomputer and the fourth single-chip microcomputer both use STM32F105R8T6 chips.

[0022] The first step-down module, the second step-down module, the third step-down module, the fourth step-down module and the fifth step-down module all adopt the LM2576 power conversion circuit.

[0023] It can be seen from the above technical scheme that the beneficial effects of the present invention are: first, the engine controller ECU and the self-diagnosis intelligent instrument can easily determine whether the bus connection is smooth or not, and even if the on-site personnel are not familiar with the bus, they can easily solve the problem; second, the on-site personnel can directly determine the correct connection or fault point of the directional switch through the directional switch self-diagnosis chart in the self-diagnosis intelligent instrument, without the need for maintenance tools for detection, thereby reducing maintenance time; third, the present invention can intuitively and conveniently detect the fingertip position, easily understand the position status of the fingertip switch, better control the lifting system, and especially better serve the on-site maintenance personnel, who can directly see from the chart whether the fingertip switch is connected correctly or not; fourth, even if there are no professional maintenance personnel, they can assist personnel in understanding the entire forklift system, and at the same time, maintenance personnel no longer need to prepare special maintenance tools, thereby reducing the weight of the tool kit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a circuit diagram of the control system of the present invention. DETAILED DESCRIPTION

[0025] like Figure 1 As shown, a self-diagnosis control system for an internal combustion forklift includes:

[0026] Battery B is used to start the forklift power supply, to supply power to the whole machine parts before the forklift is started, and to supply power to the electrical components when the generator cannot supply power after the whole machine is started;

[0027] The start switch is divided into ON position and start position. The ON position cuts off or connects the power supply of electrical components, and the start position starts the forklift;

[0028] The engine controller ECU 1 is used to control the engine. When the engine is running, the engine controller ECU 1 collects water temperature sensor parameters, fuel sensor parameters, start-on gear parameters, oil pressure sensor signals and camshaft speed signals for calculation, and converts the calculation results into control signals to control the engine. At the same time, the engine controller ECU 1 also has information transmission, fault diagnosis and protection functions;

[0029] Electronically controlled transmission controller TCU 2 is used for forklift transmission control. It collects transmission oil temperature sensor parameters, start-up ON gear parameters, pump wheel speed signal and transmission output shaft speed signal for calculation, and then automatically controls transmission reversing and automatic shifting. At the same time, electronically controlled transmission controller TCU 2 also has information transmission, fault diagnosis and protection functions;

[0030] Self-diagnosis intelligent instrument 3, collects the oil level and CAN bus data signals of the forklift, and displays and alarms according to the collected data to remind the driver to drive the forklift safely;

[0031] The direction and gear unit 4 is used for the forklift's reversing and gear shifting operations, and uploads the direction and gear position signals to the vehicle bus;

[0032] The fingertip operation unit 5 is used to operate the lifting system of the forklift to complete the cargo loading and unloading of the forklift;

[0033] The battery B supplies power to the engine controller ECU 1, the electronic transmission controller TCU 2, the self-diagnosis intelligent meter 3, the direction gear unit 4, and the fingertip operation unit 5 respectively. The engine controller ECU 1, the electronic transmission controller TCU 2, the self-diagnosis intelligent meter 3, the direction gear unit 4, and the fingertip operation unit 5 communicate with each other through the CAN bus;

[0034] The engine controller ECU 1 includes a first single-chip microcomputer, a first bus module and a first step-down module, the electronically controlled transmission controller TCU 2 includes a second single-chip microcomputer, a second bus module and a second step-down module, the self-diagnosis intelligent instrument 3 includes a third single-chip microcomputer, a third bus module, a third step-down module, a buzzer, a fault indicator light and a liquid crystal display screen, the direction gear unit 4 includes a fourth single-chip microcomputer, a fourth bus module, a fourth step-down module and a direction gear, the direction gear includes a forward gear F for controlling the forklift to move forward, a neutral gear N for starting the forklift in neutral, a reverse gear R for controlling the forklift to move backward, a 1st gear, a 2nd gear and a 3rd gear; the fingertip operation unit 5 includes a fifth bus module, a fifth step-down module and a fingertip switch.

[0035] The positive electrode of the battery B is connected to the power input end of the first step-down module through the third fuse F3, the positive electrode of the battery B is connected to the signal input detection control port of the first single-chip microcomputer through the start switch ON gear and the second fuse F2 in sequence, the positive electrode of the battery B is connected to the start signal detection port of the first single-chip microcomputer through the start switch start gear, the first single-chip microcomputer communicates with the first bus module in a two-way manner, the power output end of the first step-down module is respectively connected to the power input end of the first single-chip microcomputer and the first bus module; the signal input end of the first single-chip microcomputer collects the start signal, water temperature parameter, start switch signal and oil pressure signal;

[0036] The positive electrode of the battery B is connected to the power input end of the second step-down module through the fifth fuse F5, and the positive electrode of the battery B is connected to the signal input detection port of the second single-chip microcomputer through the start switch ON gear and the fourth fuse F4 in sequence. The second single-chip microcomputer communicates with the second bus module in a two-way manner, and the power output end of the second step-down module is respectively connected to the power input end of the second single-chip microcomputer and the second bus module; the signal input end of the second single-chip microcomputer collects the gearbox oil temperature signal, the gearbox resistance switch signal, the pump wheel and the vehicle speed signal;

[0037] The positive electrode of the battery B is connected to the power input end of the third step-down module through the start switch ON gear and the seventh fuse F7 in sequence, the power output end of the second step-down module is connected to the power input end of the third single-chip microcomputer and the third bus module respectively, the third single-chip microcomputer communicates with the third bus module bidirectionally, and the output end of the third single-chip microcomputer is connected to the input end of the buzzer Q, the fault indicator light L1, and the liquid crystal display screen respectively;

[0038] The positive electrode of the battery B is connected to the power input end of the fourth step-down module through the start switch ON gear and the first fuse F1 in sequence, the power output end of the fourth step-down module is connected to the power input end of the fourth single-chip computer and the fourth bus module respectively, the fourth single-chip computer and the fourth bus module communicate bidirectionally, the direction gear is connected between the fourth step-down module and the fourth single-chip computer, one end of each gear switch of the direction gear is connected to the power input end of the fourth step-down module, and the other end of the direction gear is connected to the signal input detection port of the fourth single-chip computer;

[0039] The positive electrode of the battery B is connected to the power input end of the fifth step-down module through the start switch ON gear and the sixth fuse F6 in sequence. The power output end of the fifth step-down module is respectively connected to the fifth bus module and the power input end of the fingertip switch. The fingertip switch signal is connected to the fifth bus module. The fingertip switch inputs the fingertip analog signal to the fifth bus module. The fifth bus module converts the fingertip analog signal into a bus signal and uploads the converted bus signal to the vehicle bus.

[0040] The first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module communicate with each other via the CAN bus; the first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module all use the TAJ1050 chip.

[0041] The first single-chip microcomputer and the second single-chip microcomputer both use MC9S12XS128MAL chips; the third single-chip microcomputer and the fourth single-chip microcomputer both use STM32F105R8T6 chips.

[0042] The first step-down module, the second step-down module, the third step-down module, the fourth step-down module and the fifth step-down module all adopt the LM2576 power conversion circuit.

[0043] The following combination Figure 1 The present invention is further described.

[0044] CAN bus self-diagnosis: When the start switch is in the ON position, the self-diagnosis intelligent instrument 3 is powered through the seventh fuse F7, and the engine controller ECU 1 is powered through the second fuse F2 and the third fuse F3, and then the first bus module and the third bus module are working. The engine controller ECU 1 detects the input engine coolant temperature signal, and then the first single-chip microcomputer performs logic operation and A / D signal processing on the signal, and then converts it into a CAN bus signal, and then uploads the bus signal to the bus through the first bus module data input Rx and output Tx, that is, the water temperature bus data packet 18FEEE00. At this time, when the third single-chip microcomputer detects the water temperature data message 18FEEE00, the LCD screen displays "working normally". If the third single-chip microcomputer cannot detect the water temperature data message, the LCD screen displays "CAN bus abnormality", the third single-chip microcomputer outputs a negative signal, and the fault indicator light L1 is lit; at the same time, the third single-chip microcomputer outputs a positive signal to drive the buzzer Q to alarm and remind the driver.

[0045] Self-diagnosis of direction switch: When the start switch is ON and closed, the direction gear unit 4 is energized through the first fuse F1 and the self-diagnosis intelligent instrument 3 is energized through the seventh fuse F7. At the same time, the fourth bus module and the third bus module are energized. When the driver operates the direction gear unit 4, for example, when the direction gear unit 4 is in neutral gear 1, here, neutral gear 1 refers to N1 gear, the direction gear unit 4 performs signal detection and processing on the detected neutral gear 1 signal, and at the same time the fourth single-chip microcomputer converts the neutral gear 1 signal into a bus signal 0x18FF5305 00 0F C1 06 00, and uploads the bus signal to the bus at the same time. When the self-diagnosis intelligent instrument 3 detects that there is a 0x18FF5305 00 0F C1 06 00 signal on the bus, the "N" and "1" positions of the direction and control system interface on the LCD screen are lit in green, and other gears are unlit in gray.

[0046] Self-diagnosis of vehicle driving gear signal: the start switch is closed, the direction gear unit 4 is powered through the first fuse F1, the engine controller ECU 1 is powered through the second fuse F2 and the third fuse F3, the electronic transmission controller TCU2 is powered through the fourth fuse F4, the self-diagnosis intelligent instrument 3 is powered through the seventh fuse F7, and then the start switch is powered, the vehicle starts, and then when the direction switch is turned to the required driving direction gear, such as forward 2nd gear, the direction gear unit 4 detects and processes the detected forward 2nd gear signal, and at the same time the fourth single-chip microcomputer converts the forward 2nd gear signal into a bus signal 0x18FF5305 0F F0 C1 06 00, and uploads the bus signal to the bus at the same time, the second single-chip microcomputer of the electronic transmission controller TCU 2 detects the direction gear information, and according to the collected engine controller ECU 1 The engine speed signal and transmission speed signal uploaded through the bus are used to execute the vehicle's driving gear according to the established logic operation program, and then the executed driving gear is uploaded to the bus through the second bus module 0x18F00503 7D 00 00 7D 20 4E FF FF, the self-diagnosis smart meter 3 detects the 0x18F00503 data, and then the self-diagnosis smart meter 3 performs data analysis according to SAE J1939, and finds that the vehicle is executing the 2F gear, then "2F" is displayed on the main interface of the LCD screen.

[0047] Fingertip operation self-diagnosis: When the start switch is closed, battery B supplies power to the fingertip switch through the start switch and the sixth fuse F6. At the same time, the self-diagnosis smart meter 3 also gets power through the seventh fuse F7. When the fingertip switch is operated, the fingertip switch converts the analog signal of the operation into a bus signal and uploads the converted bus signal 0x18FF01DC to the vehicle bus. For example, the data is 0x18FF01DC31 00 31 00 32 00 31 00. According to SAE J1939, the data is analyzed and the trajectory of the entire fingertip movement is defined as 100%. The fingertip operation moves back and forth. When not operated, the fingertip position is in the middle position, that is, 50%. According to the above data analysis, the four fingertips are all in the middle position at this time, FTC1, FTC2, FTC3, FTC4.

[0048] In summary, the engine controller ECU 1 and the self-diagnosis intelligent instrument 3 in the present invention can easily determine whether the bus connection is smooth or not, and even if the on-site personnel are not familiar with the bus, they can easily solve the problem; the on-site personnel can directly determine the correct connection or fault point of the direction switch through the direction switch self-diagnosis chart in the self-diagnosis intelligent instrument 3, without the need for maintenance tools for detection, thereby reducing maintenance time; the present invention can intuitively and conveniently detect the fingertip position, easily understand the fingertip switch position status, better control the lifting system, and especially better serve the on-site maintenance personnel, who can directly see from the chart whether the fingertip switch is connected correctly or not.

Claims

1. A self-diagnosis control system for an internal combustion forklift, characterized in that: include: Battery B is used to start the forklift power supply, to supply power to the whole machine parts before the forklift is started, and to supply power to the electrical components when the generator cannot supply power after the whole machine is started; The start switch is divided into ON position and start position. The ON position cuts off or connects the power supply of electrical components, and the start position starts the forklift; The engine controller ECU (1) is used to control the engine. When the engine is running, the engine controller ECU (1) collects water temperature sensor parameters, fuel sensor parameters, start-on gear parameters, oil pressure sensor signals and camshaft speed signals for calculation, and converts the calculation results into control signals to control the engine. At the same time, the engine controller ECU (1) also has information transmission, fault diagnosis and protection functions; The electronically controlled transmission controller TCU (2) is used for forklift transmission control. It collects transmission oil temperature sensor parameters, start-up ON gear parameters, pump wheel speed signal and transmission output shaft speed signal for calculation, and then automatically controls transmission reversing and automatic shifting. The electronically controlled transmission controller TCU (2) also has information transmission, fault diagnosis and protection functions. A self-diagnostic intelligent instrument (3) collects the oil level on the forklift and CAN bus data signals, and displays and alarms according to the collected data to remind the driver to drive the forklift safely; The direction and gear unit (4) is used for the direction and gear shifting operations of the forklift and uploads the direction and gear signals to the vehicle bus; A fingertip operating unit (5) is used to operate the lifting system of the forklift to complete the loading and unloading of goods by the forklift; The battery B supplies power to the engine controller ECU (1), the electronic transmission controller TCU (2), the self-diagnosis intelligent meter (3), the direction gear unit (4), and the fingertip operation unit (5), respectively. The engine controller ECU (1), the electronic transmission controller TCU (2), the self-diagnosis intelligent meter (3), the direction gear unit (4), and the fingertip operation unit (5) communicate with each other via a CAN bus. The positive electrode of the battery B is connected to the power input end of the first step-down module through the third fuse F3, the positive electrode of the battery B is connected to the signal input detection control port of the first single-chip microcomputer through the start switch ON gear and the second fuse F2 in sequence, the positive electrode of the battery B is connected to the start signal detection port of the first single-chip microcomputer through the start switch start gear, the first single-chip microcomputer communicates with the first bus module in a two-way manner, the power output end of the first step-down module is respectively connected to the power input end of the first single-chip microcomputer and the first bus module; the signal input end of the first single-chip microcomputer collects the start signal, water temperature parameter, start switch signal and oil pressure signal; The positive electrode of the battery B is connected to the power input end of the second step-down module through the fifth fuse F5, and the positive electrode of the battery B is connected to the signal input detection port of the second single-chip microcomputer through the start switch ON gear and the fourth fuse F4 in sequence. The second single-chip microcomputer communicates with the second bus module in a two-way manner, and the power output end of the second step-down module is respectively connected to the power input end of the second single-chip microcomputer and the second bus module; the signal input end of the second single-chip microcomputer collects the gearbox oil temperature signal, the gearbox resistance switch signal, the pump wheel and the vehicle speed signal; The positive electrode of the battery B is connected to the power input end of the third step-down module through the start switch ON gear and the seventh fuse F7 in sequence, the power output end of the second step-down module is connected to the power input end of the third single-chip microcomputer and the third bus module respectively, the third single-chip microcomputer communicates with the third bus module bidirectionally, and the output end of the third single-chip microcomputer is connected to the input end of the buzzer Q, the fault indicator light L1, and the liquid crystal display screen respectively; The positive electrode of the battery B is connected to the power input end of the fourth step-down module through the start switch ON gear and the first fuse F1 in sequence, the power output end of the fourth step-down module is connected to the power input end of the fourth single-chip computer and the fourth bus module respectively, the fourth single-chip computer and the fourth bus module communicate bidirectionally, the direction gear is connected between the fourth step-down module and the fourth single-chip computer, one end of each gear switch of the direction gear is connected to the power input end of the fourth step-down module, and the other end of the direction gear is connected to the signal input detection port of the fourth single-chip computer; The positive electrode of the battery B is connected to the power input end of the fifth step-down module through the start switch ON gear and the sixth fuse F6 in sequence, the power output end of the fifth step-down module is connected to the fifth bus module and the power input end of the fingertip switch respectively, the fingertip switch signal is connected to the fifth bus module, the fingertip switch inputs the fingertip analog signal to the fifth bus module, the fifth bus module converts the fingertip analog signal into a bus signal, and uploads the converted bus signal to the vehicle bus; The engine controller ECU (1) comprises a first single-chip microcomputer, a first bus module and a first step-down module; the electronically controlled transmission controller TCU (2) comprises a second single-chip microcomputer, a second bus module and a second step-down module; the self-diagnostic intelligent instrument (3) comprises a third single-chip microcomputer, a third bus module, a third step-down module, a buzzer, a fault indicator light and a liquid crystal display; the direction gear unit (4) comprises a fourth single-chip microcomputer, a fourth bus module, a fourth step-down module and a direction gear, the direction gear comprising a forward gear F for controlling the forklift to move forward, a neutral gear N for starting the forklift in neutral, a reverse gear R for controlling the forklift to move backward, a 1st gear, a 2nd gear and a 3rd gear; the fingertip operation unit (5) comprises a fifth bus module, a fifth step-down module and a fingertip switch; The first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module communicate with each other via the CAN bus; the first bus module, the second bus module, the third bus module, the fourth bus module and the fifth bus module all use the TAJ1050 chip.

2. The internal combustion forklift self-diagnosis control system according to claim 1, characterized in that: The first single-chip microcomputer and the second single-chip microcomputer both use MC9S12XS128MAL chips; the third single-chip microcomputer and the fourth single-chip microcomputer both use STM32F105R8T6 chips.

3. The internal combustion forklift self-diagnosis control system according to claim 1, characterized in that: The first step-down module, the second step-down module, the third step-down module, the fourth step-down module and the fifth step-down module all adopt the LM2576 power conversion circuit.

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