An engine start protection method

Abstract

The application discloses an engine starting protection system, which comprises an engine assembly, a vehicle control system and a starting motor. The engine assembly comprises a crankcase assembly, which is sequentially provided with an engine starting protection device, a double gear shaft assembly, a driven gear assembly, a freewheel assembly, a magneto rotor assembly and a crankshaft assembly in the direction of power transmission. The starting motor drives the engine starting protection device. The vehicle control system comprises a vehicle controller and a protection relay. One end of the protection relay is electrically connected with the vehicle controller, and the other end of the protection relay is electrically connected with the starting motor. The vehicle control system monitors the starting torque of the crankshaft assembly. The engine starting protection system sets carbon fiber gaskets on both sides of the starting driven gear. When the rotating torque of the engine crankshaft exceeds a set threshold, the starting driven gear and the intermediate gear slide relative to the carbon fiber gaskets, thereby protecting the starting motor.

Description

TECHNICAL FIELD

[0001] The present application relates to an engine, more particularly, to an engine starting protection method. BACKGROUND

[0002] For the engine without starting protection, when the engine starting is abnormal, the crankshaft rotation torque of the engine exceeds the safety value, which easily causes abnormal wear of the friction pair, and further damages the starting motor, and reduces the reliability and service life of the engine. Therefore, in order to avoid abnormal wear caused by abnormal starting of the engine, it is a technical problem to be solved by those skilled in the art. SUMMARY

[0003] Therefore, it is necessary to provide an engine starting protection system aiming at the above technical problems.

[0004] In order to solve the above technical problems, the present application adopts the technical scheme as follows:

[0005] An engine starting protection system, characterized in that the engine starting protection system comprises an engine assembly, a vehicle control system and a starting motor,

[0006] The engine assembly comprises a crankcase assembly, and according to the direction of power transmission, the crankcase assembly is sequentially 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, and the starting motor drives the engine starting protection device,

[0007] The vehicle control system comprises a vehicle controller and a protection relay, one end of the protection relay is electrically connected with the vehicle controller, and the other end of the protection relay is electrically connected with the starting motor,

[0008] The vehicle control system monitors the starting torque of the crankshaft assembly,

[0009] When the starting torque of the crankshaft assembly is lower than the system set first threshold value, the protection relay keeps the power-on state, and the engine starting protection device is in the normal working state,

[0010] When the starting torque of the crankshaft assembly is between the system set first threshold value and the system set second threshold value, the protection relay keeps the power-on state, and the engine starting protection device is in the unstable state,

[0011] When the starting torque of the crankshaft assembly exceeds the system set second threshold value or the current through the starting motor exceeds the safety current set thereby, the protection relay is powered off, and the starting motor and the engine starting protection device stop working.

[0012] As a preferred embodiment of the present application, the crankshaft assembly is provided with a crankshaft torque sensor.

[0013] As a preferred embodiment of the present application, the engine starting protection device comprises a starting driven gear and an intermediate gear, the starting driven gear is engaged with the motor drive gear shaft of the starting motor, the intermediate gear comprises an intermediate gear body and a hollow intermediate gear column, the intermediate gear column sequentially penetrates a first wear-resistant washer, a central hole of the starting driven gear, a second wear-resistant washer, a first washer, a pair of disc springs, a second washer and a lock nut, the intermediate gear column is provided with a double gear shaft and a needle bearing, the double gear shaft penetrates the central hole of the starting driven gear and is connected with the crankcase assembly, and both ends of the double gear shaft are provided with flat washers.

[0014] As a preferred embodiment of the present application, the first wear-resistant washer and the second wear-resistant washer are both carbon fiber washers.

[0015] As a preferred embodiment of the present application, the double gear shaft assembly comprises a double driving gear and a double driven gear, the driven gear assembly comprises a driven gear,

[0016] wherein the double driving gear is engaged with the intermediate gear, the double driven gear is engaged with the driven gear,

[0017] the overrunning clutch assembly is arranged on the driven gear assembly, the magneto rotor assembly is mounted on the overrunning clutch assembly and is fixedly connected with the crankshaft assembly.

[0018] As a preferred embodiment of the present application, the crankcase assembly comprises an upper crankcase and a lower crankcase,

[0019] the rotation axis of the motor drive gear shaft is a first axis, the rotation axes of the starting driven gear and the intermediate gear are a second axis, the rotation axes of the double driving gear and the double driven gear are a third axis, and the rotation axis of the driven gear is a fourth axis,

[0020] wherein the first axis, the second axis and the third axis are arranged on the upper crankcase, the fourth axis is a common rotation axis of the upper crankcase and the lower crankcase, and the fourth axis is collinear with the rotation axis of the crankshaft assembly 107.

[0021] As a preferred embodiment of the present application, the vehicle control system further comprises a torque overload alarm signal device, when the starting torque of the crankshaft assembly exceeds the first threshold value set by the system, the torque overload alarm signal device sends an audible or light signal prompt.

[0022] As a preferred embodiment of the present application, the whole vehicle control system further comprises a single start timeout counter, a time pool timer and a start failure warning signal device,

[0023] When the starting torque of the crankshaft assembly is between the system set first threshold value and the system set second threshold value, the single start timeout counter monitors the total time of the continuous multiple attempts to start the engine, the time pool timer monitors the number of unsuccessful frequent starts of the engine in a short time, and the start failure warning signal device sends an audible or light signal prompt.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application provides an engine starting protection system, which sets carbon fiber washers on both sides of the starting driven gear. When the starting torque of the engine crankshaft is within the design range, the starting driven gear and the intermediate gear form an integral whole under the action of the locking device and the friction of the carbon fiber washers, so that the starting motor realizes power transmission to drive the crankshaft to rotate through the starting reduction component after the control circuit is turned on. When the starting torque of the engine crankshaft exceeds the set threshold value, the starting driven gear and the intermediate gear slip relative to the carbon fiber washers, and the starting torque of the crankshaft is not transmitted to the starting motor. The control system monitors the relevant data and takes a reaction action, thereby playing 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 convenient to use, and is reliable in performance. The starting motor is prevented from overheating and burning out, the safety and reliability of the engine are improved, the service life of the engine is prolonged, the product maintenance cycle is shortened, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the schemes in the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a schematic diagram of the engine starting protection system of the present application;

[0028] Figure 2 is Figure 1 a schematic diagram of the engine starting protection device mechanism in the present application;

[0029] Figure 3 is Figure 2 a side view of the engine starting protection device mechanism in the present application;

[0030] Figure 4 is Figure 3a sectional view of the engine start protection device mechanism in the

[0031] Figure 5 is Figure 4 a partial enlarged view of the engine start protection device in the

[0032] Figure 6 is Figure 5 an exploded view of the engine start protection device in the

[0033] Figure 7 is a working principle diagram of the engine start protection system of the present application

[0034] The figure mark description is as follows:

[0035] 100-engine assembly

[0036] 101-crankcase assembly

[0037] 1011-upper crankcase

[0038] 1012-lower crankcase

[0039] 102-engine start protection device

[0040] 1021-start driven gear

[0041] 1022-intermediate gear

[0042] 1023-needle bearing

[0043] 1024-first wear-resistant washer

[0044] 1025-second wear-resistant washer

[0045] 1026-first washer

[0046] 1027-disc spring

[0047] 1028-second washer

[0048] 1029-lock nut

[0049] 102A-flat washer

[0050] 102B-double gear shaft

[0051] 103-double gear shaft assembly

[0052] 1031-double driving gear

[0053] 1032-double driven gear

[0054] 104-driven gear assembly

[0055] 1041-driven gear;

[0056] 105-overrunning clutch assembly;

[0057] 106-magneto rotor assembly;

[0058] 107-crankshaft assembly;

[0059] 108-magneto stator assembly;

[0060] 109-left cover assembly;

[0061] 110-crankshaft position sensor;

[0062] 111- crankshaft torque sensor;

[0063] 200-vehicle control system;

[0064] 201-vehicle controller;

[0065] 202-torque overload warning signal device;

[0066] 203-protection relay;

[0067] 204-single start timeout counter;

[0068] 205- time pool timer;

[0069] 206-ignition switch;

[0070] 207-start failure reminder signal device;

[0071] 300-starter motor;

[0072] 3001-motor drive gear shaft;

[0073] 400-battery. DETAILED DESCRIPTION

[0074] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application.

[0075] As shown in the figure, the engine starting protection system comprises an engine assembly 100, a vehicle control system 200 and a starter motor 300. Figure 1

[0076] ​The engine assembly 100 comprises a crankcase assembly 101, an engine start 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.

[0077] The vehicle control system 200 comprises 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 warning signal device 207.

[0078] In addition, the engine start protection system further comprises a battery 400.

[0079] The crankshaft torque sensor 111 is arranged on the crankshaft assembly 107. The magneto rotor assembly 106 is arranged at the end of the crankshaft assembly 107 and is fastened by a taper surface and a bolt.

[0080] The overrunning clutch assembly 105 is arranged on the magneto rotor assembly 106. The driven gear assembly 104 is arranged on the overrunning clutch assembly 105 and is coaxial with the crankshaft assembly 107.

[0081] In addition, the double gear shaft assembly 103, the engine start protection device 102, and the starter motor 300 are arranged parallel to the axis of the crankshaft assembly 107 and are arranged on the crankcase assembly 101 and are in power transmission by gear engagement.

[0082] The magneto stator assembly 108 and the crankshaft position sensor 110 are arranged on the left cover assembly 109, which is arranged on the crankcase assembly 101. The magneto stator assembly 108 is arranged inside and coaxial with the magneto rotor assembly 106, and the crankshaft position sensor 110 is aligned with the scale line on the magneto rotor assembly 106.

[0083] In addition, the engine start protection device 102 is arranged between the starter motor 300 and the crankshaft assembly 107. The protection relay 203 is arranged between the starter motor 300 and the vehicle controller 201.

[0084] In addition, the vehicle controller 201 is provided with the torque overload alarm signal device 202, the single start timeout counter 204, the time pool timer 205, and the start failure warning signal device 207.

[0085] As Figures 2 to 5The starting 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. The driven gear assembly 104 is provided with a driven gear 1041.

[0086] The starting 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 rotating axes are arranged in parallel with the crankshaft assembly 107. The motor driving gear shaft 3001 is in gear engagement with the starting driven gear 1021, the intermediate gear 1022 is in gear engagement with the double driving gear 1031, the double driven gear 1032 is in gear engagement with the driven gear 1041, the overrunning clutch assembly 105 is arranged on the driven gear assembly 104, and the magneto rotor assembly 106 is fixedly connected with the crankshaft assembly 107 through the overrunning clutch assembly 105 and the spline. Finally, the starting motor 300 transmits the starting torque to the crankshaft assembly 107 through the gears to provide the initial power for starting the engine.

[0087] It should be noted that the rotating axis of the motor driving gear shaft 3001 is P1, the rotating axes of the starting driven gear 1021 and the intermediate gear 1022 are P2, the rotating axes of the double driving gear 1031 and the double driven gear 1032 are P3, and the rotating axis of the driven gear 1041 is P4. Among them, the axes P1, P2 and P3 are arranged on the upper crankcase 1011, and the axis P4 is the common rotating axis of the upper crankcase 1011 and the lower crankcase 1012 (i.e. the rotating axis of the crankshaft assembly 107). Such an arrangement can improve the parallelism of the rotating axes, ensure the gear engagement accuracy, reduce the wear and vibration, and improve the service life of the engine. The rotating directions of the gears of the components are shown by the arrows in the figure, thereby driving the crankshaft assembly 107 to work.

[0088] The starting 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 in parallel on the crankcase assembly 101 through the double gear shaft 102B, the double gear shaft assembly 103 is in gear engagement with the driven gear assembly 104, and the driven gear assembly 104 is connected with the magneto rotor assembly 106 through the overrunning clutch assembly 105. The magneto rotor assembly 106 is fixedly connected with the crankshaft assembly 107 through the taper surface and the bolt. In this way, the starting motor 300 transmits the power to the crankshaft assembly 107 to start the engine.

[0089] As Figure 5 and Figure 6As shown, the engine starting protection device 102 is mounted on the crankcase assembly 101 via a double gear shaft 102B, and is positioned between the starter motor 300 and the double gear shaft assembly 103. The engine starting protection device 102 includes a starting driven gear 1021, an intermediate gear 1022, a needle roller 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 lock nut 1029, a flat washer 102A, and a double gear shaft 102B.

[0090] 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.

[0091] 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 pressing and frictional action of the first wear-resistant washer 1024 and the second wear-resistant washer 1025, the slippage torque of the starting driven gear 1021 relative to the intermediate gear 1022 is 80 to 100 N.m.

[0092] The working principle of the engine start-up protection system is explained below.

[0093] like Figure 7 As shown, the system first checks whether the engine is in a stopped state. After the ignition switch is turned on, the vehicle controller 201 monitors whether the starting torque of the crankshaft assembly 107 exceeds the system's set second threshold. If the starting torque exceeds the system's set second threshold, the protection relay 203 will immediately disconnect, preventing the starter motor 300 from working, and the torque overload alarm signal device 202 will be activated. If the starting torque does not exceed the system's set second threshold, the protection relay 203 will close, energizing the starter motor 300 and driving the crankshaft to rotate. With the protection relay 203 closed and the starter motor 300 energized, the system will make different judgments based on whether the detected crankshaft starting torque is lower than the system's set first threshold and the starting failure signal.

[0094] If the crankshaft starting torque is lower than the first threshold set by the system, the system will monitor the engine's single start time. If the single start time exceeds the system's set value (Ti>T0), the instrument light signal will continuously remind for 5 seconds and the time pool timer 205 will record the number of start timeouts. When the total number of start timeouts reaches more than 10, the protection relay 203 will also be triggered to disconnect.

[0095] If the crankshaft starting torque is between the first and second thresholds set by the system, the system will monitor not only the engine's single start time but also the number of times the engine fails to start in a short period of time. If the engine fails to start more than three times in a row, the protection relay will be triggered to disconnect.

[0096] After all the starting conditions are met, the motor 300 drives the crankshaft to rotate, the ignition is started when the crankshaft position sensor detects the crankshaft position signal, and the piston connecting rod crankshaft works normally. When the speed of the crankshaft is greater than the speed of the driven gear 1021, the overrunning clutch 105 works reversely and stops working, and the motor 300 ends the task. Thereafter, the engine converts chemical energy into rotational kinetic energy of the crankshaft connecting rod piston mechanism by means of in-cylinder combustion, and continuously provides mechanical energy.

[0097] The working principle of the engine starting protection system will be further described below.

[0098] When the vehicle control system 200 monitors 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, and at this time, the engine starting protection device 102 is in a normal working state,

[0099] The 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, and the magneto rotor assembly 106 arranged on the overrunning clutch assembly 105 also rotates forward, thereby driving the crankshaft assembly 107 to rotate forward, and the ignition is started when the crankshaft position sensor 110 detects the crankshaft position signal, and the piston connecting rod crankshaft works normally. When the speed of the rapidly rotating crankshaft assembly 107 exceeds the speed of the driven gear assembly 104, the overrunning clutch stops working reversely, and thereafter, the driven gear assembly 104, the double gear shaft assembly 103, the engine starting protection device 102 and the motor 300 no longer work, and only rely on the engine in-cylinder combustion to convert chemical energy into the mechanical energy of the crankshaft assembly 107.

[0100] 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 (80 N.m) and the second threshold value set by the system (preferably 100 N.m in this example), the torque overload alarm signal device 202 sends an audible or light signal prompt, and at the same time, the protection relay 203 still remains energized, and at this time, the engine starting protection device 102 is in an unstable state (normal working or slipping failure). When the vehicle control system 200 detects that the engine starting is abnormal, and the total time of continuous multiple attempts to start the engine exceeds the system set starting time threshold, the time pool timer 205 will count the number of frequent starting failures of the engine in a short time, and if the engine starting failure is more than 3 times, the protection relay 203 will be immediately de-energized, thereby reducing the performance degradation of the engine starting protection device 102 caused by frequent starting failures of the engine in a short time.

[0101] When the vehicle control system 200 monitors the starting torque of the crankshaft assembly 107 exceeding the system set second threshold (100N.m) or the current through the starting motor 300 exceeding the system set safe current, the protection relay 203 is immediately powered off, and the torque overload alarm signal device 202 sends an audible or light signal prompt, at this time the starting motor 300 and the engine starting protection device 102 stop working, preventing the engine overload causing the engine starting protection device 102 to wear out and the starting motor 300 to overheat and burn out.

[0102] It should be noted that when the crankshaft assembly 107 causes the starting torque to exceed the system set first threshold (80N.m) and be lower than the system set second threshold (100N.m) for some reason, the engine starting protection device 102 is in a non-stable state but can still work, and the time pool timer 205 counts the number of starting failures after the engine has an unsuccessful start, and the system's torque overload alarm signal device 202 sends an audible or light signal prompt, if the engine continuously starts to fail more than 3 times, the protection relay 203 will be immediately powered off, preventing the first wear-resistant washer 1024 and the second wear-resistant washer 1025 from being excessively worn out and failing due to frequent engine starting abnormalities in a short period of time, reducing maintenance costs.

[0103] When the vehicle control system 200 monitors the starting torque of the crankshaft assembly 107 exceeding the system set second threshold (100N.m) or the current through the starting motor 300 exceeding the system set safe current, the protection relay 203 is immediately powered off, and the torque overload alarm signal device 202 sends an audible or light signal prompt, at this time the starting motor 300 will stop working, preventing the engine starting protection device 102 from being abnormally worn out and the starting motor 300 from overheating and burning out.

[0104] The engine starting protection system sets 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 realizes power transmission to drive the crankshaft to rotate through the starting reduction component after the control circuit is turned on; when the engine crankshaft rotating torque exceeds the set threshold, the starting driven gear and the intermediate gear slip relative to the carbon fiber washers, the crankshaft rotating torque is not transmitted to the starting motor, the control system monitors the relevant data and takes action, playing 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 and reliability of the engine and the service life, shortens the product maintenance cycle, and reduces maintenance costs.

[0105] Obviously, the above-described embodiments are only some embodiments but not all the embodiments of the present application, and the preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application.

Claims

1. An engine starting protection method, characterized in that, The vehicle control system (200) monitors the starting torque of the crankshaft assembly (107) of the engine assembly (100). When the starting torque of the crankshaft assembly (107) is lower than the first threshold set by the system, the protection relay (203) of the vehicle control system (200) remains energized, and the engine starting protection device (102) of the engine assembly (100) is in normal working condition. When the starting torque of the crankshaft assembly (107) is between the system-set first threshold and the system-set second threshold, 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 the second threshold set by the system, or when the current through the starter motor (300) exceeds its set safe current, the protection relay (203) is de-energized, and the starter motor (300) and the engine starting protection device (102) stop working. in, The engine assembly (100) further includes a crankcase assembly (101). According to the direction of power transmission, the crankcase assembly (101) is sequentially 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). The starter motor (300) drives the engine starting protection device (102). The engine starting protection device (102) includes a starting driven gear (1021) and an intermediate gear (1022). The starting driven gear (1021) meshes with the motor drive gear shaft (3001) of the starter motor (300). The intermediate gear (1022) includes an intermediate gear body (…). The crankcase assembly (101) consists of a hollow intermediate gear column (10221) and a first wear-resistant washer (1024), a central hole (10211) of the starting driven gear (1021), a second wear-resistant washer (1025), a first washer (1026), a pair of disc springs (1027), a second washer (1028), and a locking nut (1029). The intermediate gear column (10222) contains a double gear shaft (102B) and a needle roller bearing (1023). The double gear shaft (102B) passes through the central hole (10211) of the starting driven gear (1021) and is connected to the crankcase assembly (101). Flat washers (102A) are provided at both ends of the double gear shaft (102B). The vehicle control system (200) further includes a vehicle controller (201) and a protection relay (203). One end of the protection relay (203) is electrically connected to the vehicle controller (201), and the other end of the protection relay (203) is electrically connected to the starter motor (300). The vehicle control system (200) further includes a single start timeout counter (204), a time pool timer (205), and a start failure warning signal device (207). When the starting torque of the crankshaft assembly (107) is between the first threshold and the second threshold set by the system, the single start timeout counter (204) monitors whether the total time for multiple consecutive engine start attempts exceeds the system-set start time threshold, the time pool timer (205) monitors the number of times the engine fails to start frequently in a short period of time, and the start failure reminder signal device (207) emits an audible or visual signal to indicate the failure.

2. The engine starting protection method according to claim 1, characterized in that, A crankshaft torque sensor (111) is provided on the crankshaft assembly (107).

3. The engine starting protection method according to claim 1, characterized in that, Both the first wear-resistant washer (1024) and the second wear-resistant washer (1025) are carbon fiber washers.

4. The engine starting protection method according to claim 3, characterized in that, The double gear shaft assembly (103) includes a double driving gear (1031) and a double driven gear (1032), and the driven gear assembly (104) includes a driven gear (1041). in, The double-drive gear (1031) meshes with the intermediate gear (1022), and the double-driven gear (1032) meshes with the driven gear (1041). The overrunning clutch assembly (105) is disposed on the driven gear assembly (104), and the magneto rotor assembly (106) is mounted on the overrunning clutch assembly (105) and fixedly connected to the crankshaft assembly (107).

5. The engine starting protection method according to claim 4, characterized in that, The crankcase assembly (101) includes 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 set on the upper crankcase (1011), and the fourth axis (P4) is the common rotation axis of the upper crankcase (1011) and the lower crankcase (1012). The fourth axis (P4) is collinear with the rotation axis of the crankshaft assembly (107).

6. The engine starting protection method according to claim 1, characterized in that, The vehicle control system (200) also includes a torque overload alarm signal device (202). When the starting torque of the crankshaft assembly (107) exceeds the first threshold set by the system, the torque overload alarm signal device (202) emits an audible or visual signal to indicate the overload.

Images