Engine starting protection system

Abstract

The invention discloses an engine starting protection system which comprises an engine assembly, a whole vehicle control system and a starting motor, the engine assembly comprises a crankcase assembly, and the crankcase assembly is connected with the whole vehicle control system according to the power transmission direction. The crankcase assembly is sequentially provided with an engine starting protection device, a duplicate gear shaft assembly, a driven gear assembly, an overrun clutch assembly, a magneto rotor assembly and a crankshaft assembly, the starting motor drives the engine starting protection device, and the whole vehicle control system comprises a whole vehicle controller and a protection relay. One end of the protection relay is electrically connected with the vehicle control unit, the other end of the protection relay is electrically connected with the starting motor, and the vehicle control system monitors the starting torque of the crankshaft assembly. According to the engine starting protection system, the carbon fiber gaskets are arranged on the two sides of the starting driven gear, when the rotating torque of an engine crankshaft exceeds a set threshold value, the starting driven gear and the intermediate gear slip relative to the carbon fiber gaskets, and the effect of protecting the starting motor is achieved.

Description

Technical Field

[0001] The invention relates to an engine, and more particularly to an engine starting protection system. Background Art

[0002] For an engine without starting protection, when the engine starts abnormally, causing the engine crankshaft rotation torque to exceed the safe value, it is very easy to cause abnormal wear of the friction pair, thereby damaging the starter motor and reducing the reliability and life of the engine. Therefore, in order to avoid abnormal wear caused by abnormal engine starting, it is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] Based on this, it is necessary to provide an engine starting protection system to address the above technical issues.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: An engine starting protection system, characterized in that the engine starting protection system comprises an engine assembly, a vehicle control system and a starter motor, The engine assembly includes a crankcase assembly. According to the direction of power transmission, the crankcase assembly is provided with an engine starting protection device, a double gear shaft assembly, a driven gear assembly, an overrunning clutch assembly, a magneto rotor assembly and a crankshaft assembly in sequence. The starter motor drives the engine starting protection device. The vehicle control system includes a vehicle controller and a protection relay, one end of the protection relay is electrically connected to the vehicle controller, and the other end of the protection relay is electrically connected to the starter motor. Wherein, the vehicle control system monitors the starting torque of the crankshaft assembly, When the starting torque of the crankshaft assembly is lower than the first threshold value set by the system, the protection relay remains energized and the engine starting protection device is in a normal working state. When the starting torque of the crankshaft assembly is between the first threshold value set by the system and the second threshold value set by the system, the protection relay remains energized, and the engine starting protection device is in an unstable state. When the starting torque of the crankshaft assembly exceeds the second threshold value set by the system or the current passing through the starter motor exceeds its set safety current, the protection relay is de-energized, and the starter motor and the engine starting protection device stop working.

[0005] As a preferred embodiment of the present invention, a crankshaft torque sensor is provided on the crankshaft assembly.

[0006] As a preferred embodiment of the present invention, the engine starting protection device includes a starting driven gear and an intermediate gear, the starting driven gear is meshed with the motor driving gear shaft of the starter motor, the intermediate gear includes an intermediate gear body and a hollow intermediate gear column, the intermediate gear column sequentially penetrates the first wear-resistant washer, the center hole of the starting driven gear, the second wear-resistant washer, the first washer, a pair of disc springs, the second washer and the locking nut, a double gear shaft and a needle bearing are arranged in the intermediate gear column, the double gear shaft penetrates the center hole of the starting driven gear and is connected to the crankcase assembly, and flat washers are arranged at both ends of the double gear shaft.

[0007] As a preferred embodiment of the present invention, the first wear-resistant washer and the second wear-resistant washer are both carbon fiber washers.

[0008] As a preferred embodiment of the present invention, the double gear shaft assembly comprises a double driving gear and a double driven gear, and the driven gear assembly comprises a driven gear. Wherein, the double driving gear is meshed with the intermediate gear, and the double driven gear is meshed with the driven gear. The overrunning clutch assembly is arranged on the moving gear assembly, and the magnetic motor rotor assembly is installed on the overrunning clutch assembly and is fixedly connected to the crankshaft assembly.

[0009] As a preferred embodiment of the present invention, the crankcase assembly comprises an upper crankcase and a lower crankcase. The rotation axis of the motor drive gear shaft is the first axis, the rotation axis of the starting driven gear and the intermediate gear is the second axis, the rotation axis of the double driving gear and the double driven gear is the third axis, and the rotation axis of the driven gear is the fourth axis. Among them, the first axis, the second axis and the third axis are all arranged on the upper crankcase, the fourth axis is the common rotation axis of the upper crankcase and the lower crankcase, and the fourth axis is colinear with the rotation axis of the crankshaft assembly 107.

[0010] As a preferred embodiment of the present invention, the vehicle control system further includes a torque overload alarm signal device. When the starting torque of the crankshaft assembly exceeds the first threshold set by the system, the torque overload alarm signal device emits a sound or light signal prompt.

[0011] As a preferred embodiment of the present invention, the vehicle control system further comprises a single start timeout counter, a time pool timer and a start failure reminder signal device. When the starting torque of the crankshaft assembly is between the first threshold value set by the system and the second threshold value set by the system, the single start timeout counter monitors the total time of multiple consecutive attempts to start the engine, the time pool timer monitors the number of frequent unsuccessful starts of the engine in a short period of time, and the start failure reminder signal device emits a sound or light signal prompt.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an engine starting protection system, which is provided with carbon fiber washers on both sides of the starting driven gear. When the engine crankshaft starting torque is within the design range, the starting driven gear and the intermediate gear form a whole under the action of the friction force of the locking device and the carbon fiber washers, so that the starting motor realizes power transmission through the starting reduction component to drive the crankshaft to rotate after the control circuit is connected; when the engine crankshaft rotation torque exceeds the set threshold, the starting driven gear and the intermediate gear slip relative to the carbon fiber washers, and the crankshaft rotation torque is not transmitted to the starting motor. The control system monitors relevant data and responds, thereby protecting the starting motor and related parts. The present application solves the technical problems existing in the prior art, has a simple structure, is easy to use, has reliable performance, avoids overheating and burning of the starting motor, improves the safety reliability and service life of the engine, shortens the product maintenance cycle, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 is a schematic diagram of an engine starting protection system of the present invention; Figure 2 yes Figure 1 A three-dimensional structural diagram of the engine starting protection device mechanism; Figure 3 yes Figure 2 A side view of the engine starting protection device mechanism in FIG. Figure 4 yes Figure 3 A cross-sectional view of the engine starting protection device mechanism in FIG. Figure 5 yes Figure 4 A partial enlarged view of Figure 6 yes Figure 5 The structural explosion diagram of the engine starting protection device in FIG. Figure 7It is a working principle diagram of the engine starting protection system of the present invention; The markings in the figure are as follows: 100-engine assembly; 101 - crankcase assembly; 1011 - upper crankcase; 1012 - lower crankcase; 102-engine starting protection device; 1021 - starting driven gear; 1022 - intermediate gear; 1023-needle roller bearing; 1024 - first wear-resistant washer; 1025 - second wear-resistant washer; 1026 - first gasket; 1027 - disc spring; 1028 - second gasket; 1029 - locking nut; 102A- flat washer; 102B-Double gear shaft; 103-Double gear shaft assembly; 1031-Double driving gear; 1032-Double driven gear; 104 - driven gear assembly; 1041 - driven gear; 105 - Overrunning clutch assembly; 106-magneto rotor assembly; 107 - crankshaft assembly; 108-magneto stator assembly; 109 - left cover assembly; 110 - crankshaft position sensor; 111-crankshaft torque sensor; 200-Vehicle control system; 201-Vehicle controller; 202-Torque overload alarm signal device; 203-protection relay; 204 - Single start timeout counter; 205-Time Pool Timer; 206 - ignition switch; 207-failure start warning signal device; 300 - start the motor; 3001-motor drive gear shaft; 400 - Battery. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] like Figure 1 As shown, the engine starting protection system includes an engine assembly 100 , a vehicle control system 200 and a starter motor 300 .

[0017] The engine assembly 100 includes a crankcase assembly 101, an engine starting protection device 102, a double gear shaft assembly 103, a driven gear assembly 104, an overrunning clutch assembly 105, a magneto rotor assembly 106, a crankshaft assembly 107, a magneto stator assembly 108, a left cover assembly 109, a crankshaft position sensor 110, and a crankshaft torque sensor 111.

[0018] The vehicle control system 200 includes a vehicle controller 201, a torque overload alarm signal device 202, a protection relay 203, a single start timeout counter 204, a time pool timer 205, an ignition switch 206, and a start failure reminder signal device 207.

[0019] In addition, the engine starting protection system further includes a battery 400 .

[0020] A crankshaft torque sensor 111 is provided on the crankshaft assembly 107. The magnetic motor rotor assembly 106 is provided at the end of the crankshaft assembly 107 and is fastened by a conical surface and bolts.

[0021] The overrunning clutch assembly 105 is disposed on the magneto rotor assembly 106 . The driven gear assembly 104 is disposed on the overrunning clutch assembly 105 and is coaxial with the crankshaft assembly 107 .

[0022] In addition, the double gear shaft assembly 103, the engine starting protection device 102 and the starter motor 300 are arranged parallel to the axis of the crankshaft assembly 107 and are disposed on the crankcase assembly 101, and transmit power through the meshing of gears.

[0023] The magneto stator assembly 108 and the crankshaft position sensor 110 are arranged on the left cover assembly 109, and the left cover assembly 109 is arranged on the crankcase assembly 101. The magneto stator assembly 108 is arranged inside the magneto rotor assembly 106 and is coaxial therewith, and the crankshaft position sensor 110 is aligned with the scale line on the magneto rotor assembly 106.

[0024] In addition, an engine starting protection device 102 is provided between the starter motor 300 and the crankshaft assembly 107. A protection relay 203 is provided between the starter motor 300 and the vehicle controller 201.

[0025] In addition, the vehicle controller 201 is provided with a torque overload alarm signal device 202 , a single start timeout counter 204 , a time pool timer 205 and a start failure reminder signal device 207 .

[0026] like Figures 2 to 5 As shown, the starter motor 300 is provided with a motor driving gear shaft 3001. The engine starting protection device 102 is provided with a starting driven gear 1021 and an intermediate gear 1022. The double gear shaft assembly 103 is provided with a double driving gear 1031 and a double driven gear 1032, and the driven gear assembly 104 is provided with a driven gear 1041.

[0027] The starter motor 300, the engine starting protection device 102 and the double gear shaft assembly 103 are all arranged on the upper crankcase 1011, and all the rotation axes are arranged parallel to the crankshaft assembly 107. The motor driving gear shaft 3001 is gear-engaged with the starting driven gear 1021, the intermediate gear 1022 is gear-engaged with the double driving gear 1031, the double driven gear 1032 is gear-engaged with the driven gear 1041, the overrunning clutch assembly 105 is arranged on the driven gear assembly 104, the magnetic motor rotor assembly 106 is installed on the overrunning clutch assembly 105 and is fixedly connected to the crankshaft assembly 107 through bolts and splines, and finally the starter motor 300 transmits the starting torque to the crankshaft assembly 107 through gears to provide initial power for engine starting.

[0028] It should be noted that the rotation axis of the motor drive gear shaft 3001 is P1, the rotation axis of the starter driven gear 1021 and the intermediate gear 1022 is P2, the rotation axis of the double driving gear 1031 and the double driven gear 1032 is P3, and the rotation axis of the driven gear 1041 is P4. Among them, the axes P1, P2 and P3 are all arranged on the upper crankcase 1011, and the axis P4 is the common rotation axis of the upper crankcase 1011 and the lower crankcase 1012 (i.e., the rotation axis of the crankshaft assembly 107). Such an arrangement can improve the parallelism of each rotating axis, ensure the gear meshing accuracy, reduce wear and vibration, and increase the service life of the engine. The rotation direction of the gears of each component is shown by the arrows in the figure, thereby driving the crankshaft assembly 107 to work.

[0029] The starter motor 300 and the crankshaft assembly 107 are arranged in parallel on the crankcase assembly 101, the engine starting protection device 102 and the double gear shaft assembly 103 are arranged on the crankcase assembly 101 through the double gear shaft 102B and are arranged in parallel with the crankcase assembly 101, the double gear shaft assembly 103 is meshed with the driven gear assembly 104, and then connected to the magneto rotor assembly 106 through the overrunning clutch assembly 105, and the magneto rotor assembly 106 is fixedly connected to the crankshaft assembly 107 through a cone surface and bolts. Thus, the starter motor 300 transmits power to the crankshaft assembly 107 to start the engine.

[0030] like Figure 5 and Figure 6 As shown, the engine starting protection device 102 is installed on the crankcase assembly 101 through the double gear shaft 102B, and is arranged between the starter motor 300 and the double gear shaft assembly 103. The engine starting protection device 102 comprises a starting driven gear 1021, an intermediate gear 1022, a needle bearing 1023, a first wear-resistant washer 1024, a second wear-resistant washer 1025, a first washer 1026, a disc spring 1027, a second washer 1028, a locking nut 1029, a flat washer 102A and a double gear shaft 102B.

[0031] It should be noted that the first wear-resistant washer 1024 and the second wear-resistant washer 1025 can be carbon fiber washers or made of other wear-resistant materials.

[0032] After the engine starting protection device 102 is assembled as required, the tightening torque of the locking nut 1029 is preferably set to 70 N.m. Under the compression and friction of the first wear-resistant washer 1024 and the second wear-resistant washer 1025, the slip torque of the starting driven gear 1021 relative to the intermediate gear 1022 is 80 to 100 N.m.

[0033] The working mode of the engine starting protection system is described below.

[0034] like Figure 7 As shown, the system first detects whether the engine is in a shutdown state. After the ignition switch is turned on, the vehicle controller 201 monitors whether the starting torque of the crankshaft assembly 107 exceeds the second threshold value set by the system. If the starting torque exceeds the second threshold value set by the system, the protection relay 203 will be disconnected immediately to protect the starter motor 300 from working, and the torque overload alarm signal device 202 will be started at the same time; if the starting torque does not exceed the second threshold value set by the system, the protection relay 203 will be closed, and the starter motor 300 will be powered on to drive the crankshaft to rotate. When the protection relay 203 is closed and the starter motor 300 is powered on, the system will make different judgments based on whether the detected crankshaft starting torque is lower than the first threshold value set by the system and the start failure signal.

[0035] If the crankshaft starting torque is lower than the first threshold set by the system, the system will monitor the single starting time of the engine. If the single starting time exceeds the system setting value (Ti>T0), the instrument light signal will continue to remind for 5 seconds and the time pool timer 205 will record the number of starting timeouts. When the total number of starting timeouts reaches more than 10 times, the protection relay 203 will also be triggered to disconnect.

[0036] If the crankshaft starting torque is between the first threshold and the second threshold set by the system, in addition to monitoring the single engine starting time, the system will also monitor the number of consecutive unsuccessful engine starts in a short period of time. If the engine fails to start successfully for more than three consecutive times, the protection relay will be triggered to disconnect.

[0037] After all starting conditions are met, the starter motor 300 drives the crankshaft to rotate, and the crankshaft position sensor starts to ignite when it detects the crankshaft position signal, driving the piston connecting rod crankshaft to work normally. When the crankshaft speed is greater than the speed of the starting driven gear 1021, the overrunning clutch 105 does not work in the reverse direction, and the starter motor 300 ends its task. After that, the engine relies on the combustion in the cylinder to convert chemical energy into the rotational kinetic energy of the crankshaft connecting rod piston mechanism, and continuously provides mechanical energy.

[0038] The working principle of the engine starting protection system is further explained below.

[0039] When the vehicle control system 200 detects that the starting torque of the crankshaft assembly 107 is lower than the first threshold value set by the system (preferably 80 N.m in this example), the torque overload alarm signal device 202 does not work, and the protection relay 203 remains energized. At this time, the engine starting protection device 102 is in a normal working state. The starter motor 300 drives the driven gear assembly 104 to rotate forward through the engine starting protection device 102 and the double gear shaft assembly 103. At this time, the driven gear assembly 104 drives the overrunning clutch assembly 105 to rotate in the same direction. The magneto rotor assembly 106 set on the overrunning clutch assembly 105 also rotates forward, thereby driving the crankshaft assembly 107 to rotate forward. When the crankshaft position sensor 110 detects the crankshaft position signal, it starts to ignite and drives the piston connecting rod crankshaft to work normally. When the speed of the fast-rotating crankshaft assembly 107 exceeds the speed of the driven gear assembly 104, the overrunning clutch stops working in the reverse direction. Thereafter, the driven gear assembly 104, the double gear shaft assembly 103, the engine starting protection device 102 and the starter motor 300 no longer work, and only rely on the combustion in the engine cylinder to convert chemical energy into a continuous mechanical energy of the crankshaft assembly 107.

[0040] When the vehicle control system 200 monitors that the starting torque of the crankshaft assembly 107 is between the first threshold value set by the system (80N.m) and the second threshold value set by the system (preferably 100N.m in this example), the torque overload alarm signal device 202 emits a sound or light signal prompt, and the protection relay 203 remains energized. At this time, the engine starting protection device 102 is in an unstable state (normal operation or slip failure). When the vehicle control system 200 detects an abnormal engine start, and the total time of the engine's multiple consecutive attempts to start exceeds the system-set start time threshold, the time pool timer 205 will count the number of frequent unsuccessful starts of the engine in a short period of time. If the engine start fails for more than 3 times, the protection relay 203 will immediately cut off the power to reduce the performance degradation of the engine starting protection device 102 caused by the frequent abnormal engine start in a short period of time.

[0041] When the vehicle control system 200 detects that the starting torque of the crankshaft assembly 107 exceeds the second threshold value (100 N.m) set by the system or the current passing through the starter motor 300 exceeds its set safety current, the protection relay 203 is immediately de-energized, and the torque overload alarm signal device 202 emits a sound or light signal prompt. At this time, the starter motor 300 and the engine starting protection device 102 will stop working to prevent the engine from overloading and causing the engine starting protection device 102 to wear and fail and the starter motor 300 to overheat and burn.

[0042] It should be noted that when the crankshaft assembly 107 causes the starting torque to exceed the first threshold value (80N.m) set by the system and be lower than the second threshold value (100N.m) set by the system for some reason, the engine starting protection device 102 is in an unstable state but can still work. The time pool timer 205 will count the number of starting failures after the engine fails to start successfully. At the same time, the system's torque overload alarm signal device 202 will emit a sound or light signal prompt. If the engine fails to start continuously for more than 3 times, the protection relay 203 will immediately cut off the power to prevent the engine from frequently starting abnormally in a short period of time, causing the first wear-resistant gasket 1024 and the second wear-resistant gasket 1025 to fail due to excessive wear, thereby reducing maintenance costs.

[0043] When the vehicle control system 200 detects that the starting torque of the crankshaft assembly 107 exceeds the second threshold value (100 N.m) set by the system, or the current passing through the starter motor 300 exceeds its set safety current, the protection relay 203 is immediately de-energized, and the torque overload alarm signal device 202 emits a sound or light signal prompt. At this time, the starter motor 300 will stop working to prevent overload from causing abnormal wear and failure of the engine starting protection device 102 and overheating and burning of the starter motor 300.

[0044] The engine starting protection system is provided with carbon fiber washers on both sides of the starting driven gear. When the engine crankshaft starting torque is within the design range, the starting driven gear and the intermediate gear form a whole under the action of the locking device and the friction of the carbon fiber washers, so that the starting motor can realize power transmission through the starting reduction component to drive the crankshaft to rotate after the control circuit is connected; when the engine crankshaft rotation torque exceeds the set threshold, the starting driven gear and the intermediate gear slip relative to the carbon fiber washers, and the crankshaft rotation torque is not transmitted to the starting motor. The control system monitors the relevant data and responds to the action, which plays a role in protecting the starting motor and related parts. The present application solves the technical problems existing in the prior art, has a simple structure, is easy to use, has reliable performance, avoids overheating and burning of the starting motor, improves the safety reliability and service life of the engine, shortens the product maintenance cycle, and reduces maintenance costs.

[0045] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. An engine starting protection system, characterized in that: The engine starting protection system comprises an engine assembly (100), a vehicle control system (200) and a starter motor (300). The engine assembly (100) comprises a crankcase assembly (101). According to the direction of power transmission, the crankcase assembly (101) is provided with an engine starting protection device (102), a double gear shaft assembly (103), a driven gear assembly (104), an overrunning clutch assembly (105), a magneto rotor assembly (106) and a crankshaft assembly (107) in sequence. The starter motor (300) drives the engine starting protection device (102). The vehicle control system (200) comprises a vehicle controller (201) and a protection relay (203), one end of the protection relay (203) being electrically connected to the vehicle controller (201), and the other end of the protection relay (203) being electrically connected to the starter motor (300). Wherein, the vehicle control system (200) monitors the starting torque of the crankshaft assembly (107). When the starting torque of the crankshaft assembly (107) is lower than a first threshold value set by the system, the protection relay (203) remains energized, and the engine starting protection device (102) is in a normal working state. When the starting torque of the crankshaft assembly (107) is between a first threshold value set by the system and a second threshold value set by the system, the protection relay (203) remains energized, and the engine starting protection device (102) is in an unstable state. When the starting torque of the crankshaft assembly (107) exceeds a second threshold value set by the system or the current passing through the starter motor (300) exceeds its set safety current, the protection relay (203) is de-energized, and the starter motor (300) and the engine starting protection device (102) stop working.

2. The engine starting protection system according to claim 1, characterized in that: The crankshaft assembly (107) is provided with a crankshaft torque sensor (111).

3. The engine starting protection system according to claim 1, characterized in that: The engine starting protection device (102) comprises a starting driven gear (1021) and an intermediate gear (1022), wherein the starting driven gear (1021) is meshed with a motor driving gear shaft (3001) of a starting motor (300), and the intermediate gear (1022) comprises an intermediate gear body (10221) and a hollow intermediate gear column (10222), wherein the intermediate gear column (10222) sequentially passes through a first wear-resistant washer (1024), a center hole (10211) of the starting driven gear (1021), and a first wear-resistant washer (1024). Two wear-resistant washers (1025), a first washer (1026), a pair of disc springs (1027), a second washer (1028) and a locking nut (1029); a double gear shaft (102B) and a needle bearing (1023) are arranged in the intermediate gear column (10222); the double gear shaft (102B) passes through the center hole (10211) of the starting driven gear (1021) and is connected to the crankcase assembly (101); flat washers (102A) are arranged at both ends of the double gear shaft (102B).

4. The engine starting protection system according to claim 3, characterized in that: The first wear-resistant washer (1024) and the second wear-resistant washer (1025) are both carbon fiber washers.

5. The engine starting protection system according to claim 3, characterized in that: The double gear shaft assembly (103) comprises a double driving gear (1031) and a double driven gear (1032), and the driven gear assembly (104) comprises a driven gear (1041). in, The double driving gear (1031) is meshed with the intermediate gear (1022), and the double driven gear (1032) is meshed with the driven gear (1041). The overrunning clutch assembly (105) is arranged on the driven gear assembly (104), and the magnetic motor rotor assembly (106) is mounted on the overrunning clutch assembly (105) and fixedly connected to the crankshaft assembly (107).

6. The engine starting protection system according to claim 5, characterized in that: The crankcase assembly (101) comprises an upper crankcase (1011) and a lower crankcase (1012). The rotation axis of the motor drive gear shaft (3001) is the first axis (P1), the rotation axis of the starting driven gear (1021) and the intermediate gear (1022) is the second axis (P2), the rotation axis of the double driving gear (1031) and the double driven gear (1032) is the third axis (P3), and the rotation axis of the driven gear (1041) is the fourth axis (P4). The first axis (P1), the second axis (P2) and the third axis (P3) are all arranged on the upper crankcase (1011), the fourth axis (P4) is the common rotation axis of the upper crankcase (1011) and the lower crankcase (1012), and the fourth axis (P4) is colinear with the rotation axis of the crankshaft assembly 107.

7. The engine starting protection system according to claim 1, characterized in that: The vehicle control system (200) further comprises a torque overload alarm signal device (202), and when the starting torque of the crankshaft assembly (107) exceeds the first threshold value set by the system, the torque overload alarm signal device (202) emits a sound or light signal prompt.

8. The engine starting protection system according to claim 1, characterized in that: The vehicle control system (200) further comprises a single start timeout counter (204), a time pool timer (205) and a start failure reminder signal device (207). When the starting torque of the crankshaft assembly (107) is between a first threshold value set by the system and a second threshold value set by the system, the single start timeout counter (204) monitors the total time of multiple consecutive attempts to start the engine, the time pool timer (205) monitors the number of frequent unsuccessful starts of the engine in a short period of time, and the start failure reminder signal device (207) emits a sound or light signal prompt.

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