Engine shutdown device, shutdown method and automobile

Abstract

The invention discloses an engine shutdown device, a shutdown method and an automobile, and relates to the technical field of engine shutdown, the engine shutdown device comprises a shell, a piston and a middle shaft of a gearbox, a piston cavity is formed in the shell, the piston is arranged in the piston cavity and can move in the axial direction, a first shutdown assembly is arranged on the piston, and a second shutdown assembly is arranged on the middle shaft of the gearbox. The intermediate shaft and the piston are coaxially arranged, a second stopping assembly is arranged on the intermediate shaft, when the piston cavity is inflated, the piston moves to drive the first stopping assembly to press the second stopping assembly so that the intermediate shaft can be braked, and therefore an engine flywheel connected with a gearbox clutch can stop rotating, and when gas is exhausted from the piston cavity, the engine flywheel can stop rotating. The piston moves to drive the first stopping assembly to break away from the second stopping assembly, and intermediate shaft braking is relieved. The braking force of the intermediate shaft is transmitted to the engine flywheel through the front auxiliary box gear and the clutch, so that the engine is stopped stably, the stopping stability of the engine is improved, shaking or shaking of a cab is avoided, and the driving feeling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine shutdown, and in particular to an engine shutdown device, a shutdown method and a vehicle. Background Art

[0002] With the development of vehicle technology, users have become more and more demanding in terms of the subjective experience of driving a vehicle. Currently, during the parking process and the final moment of shutting down, the cab will shake or vibrate. Since the current engine mainly uses fuel cut-off and closing the intake throttle to stop the engine during the shutdown process, a small amount of fresh air will still enter the cylinder due to the inertia of the airflow, and fuel cut-off cannot quickly and completely prevent the combustion of residual oil and gas. This will result in the engine speed not being able to drop linearly and return to zero quickly during the shutdown process. In addition, due to the unevenness of the independent operation of each cylinder, the crankshaft speed jumps directly. This nonlinear change in the crankshaft speed during the shutdown process and the extension of the speed zeroing process cause the engine body to jump, which will be transmitted to the frame through the engine mount and perceived by the driver through the transmission paths such as the frame, body, seat and steering wheel. Therefore, it is urgent to develop an engine shutdown device to meet the requirements of smooth and fast engine shutdown. Summary of the Invention

[0003] The embodiments of the present invention provide an engine stopping device, a stopping method and a vehicle, so as to meet the requirements of smooth and rapid engine shutdown.

[0004] In a first aspect, an engine shutdown device is provided, comprising: a housing, wherein a piston chamber is provided in the housing; A piston, the piston being disposed in the piston cavity, the piston being movable in the axial direction, and the piston being provided with a first shutdown assembly; an intermediate shaft of the gearbox, the intermediate shaft being coaxially arranged with the piston and having a second shutdown assembly provided on the intermediate shaft; When air is inflated into the piston chamber, the piston moves to drive the first stop assembly to press the second stop assembly to brake the intermediate shaft, thereby stopping the engine flywheel connected to the transmission clutch; When the gas is discharged from the piston chamber, the piston moves to drive the first parking assembly to separate from the second parking assembly, thereby releasing the intermediate shaft brake.

[0005] In some embodiments, the first shutdown component is a plurality of steel plates, which are arranged at intervals, and the second shutdown component is a plurality of friction plates, which are arranged at intervals, and each friction plate is located between every two steel plates.

[0006] In some embodiments, the engine shutdown device further comprises: An air charging device is connected to an air inlet provided at the top end of the shell, and the air inlet is connected to the piston chamber.

[0007] In some embodiments, the engine shutdown device further comprises: A solenoid valve is provided between the inflation device and the air inlet, and is used to adjust the opening of the air inlet.

[0008] In some embodiments, the engine shutdown device further comprises: A return spring is coaxially arranged with the intermediate shaft and located at the top end of the intermediate shaft, and the top end of the return spring is connected to the piston.

[0009] In some embodiments, the engine shutdown device further comprises: A top sleeve is arranged on the outside of the return spring, and the top end of the top sleeve cooperates with the piston.

[0010] In some embodiments, a tip is provided at the top end of the top sleeve, and the tip abuts against the piston.

[0011] In a second aspect, an engine shutdown method is provided, using the aforementioned engine shutdown device, comprising: When receiving the engine stop command, the engine speed is detected to determine whether the engine speed decreases; If so, the piston cavity is inflated to move the piston, driving the first stop assembly to press against the second stop assembly to start braking the intermediate shaft, and then determining whether the engine speed continues to decrease; If the engine speed continues to drop, continue to inflate the piston chamber until the engine speed reaches zero, completing the engine shutdown; if the engine speed does not continue to drop, discharge the gas in the piston chamber, causing the piston to move and drive the first shutdown assembly to disengage from the second shutdown assembly, releasing the intermediate shaft brake.

[0012] In some embodiments, if the engine speed continues to decrease, continuing to charge the piston cavity until the engine speed reaches zero, thereby completing the engine shutdown, includes: Increase the amount of air flowing into the piston chamber.

[0013] According to a third aspect, a vehicle is provided, which uses the aforementioned engine stop device.

[0014] The beneficial effects brought about by the technical solution provided by the present invention include: An embodiment of the present invention provides an engine shutdown device, a shutdown method, and a vehicle. The engine shutdown device includes a housing, a piston, and an intermediate shaft of a transmission. The housing defines a piston cavity. The piston is disposed in the cavity and is axially movable. A first shutdown assembly is disposed on the piston. The intermediate shaft is coaxially disposed with the piston and is provided with a second shutdown assembly. When gas is inflated into the piston cavity, the piston moves, driving the first shutdown assembly to press against the second shutdown assembly, braking the intermediate shaft. This applies reverse braking resistance to the engine flywheel connected to the transmission clutch, inhibiting rotation of the flywheel and ultimately stopping it. When gas is discharged from the piston cavity, the piston moves, driving the first shutdown assembly to disengage from the second shutdown assembly, releasing the intermediate shaft brake. The piston reciprocates within the piston cavity, driving the first shutdown assembly to press against or disengage from the second shutdown assembly. This causes the intermediate shaft braking force to be transmitted to the engine flywheel via the front auxiliary gear and clutch, stopping the engine flywheel and thus smoothly shutting down the engine. This improves the smoothness of engine shutdown, avoids shaking or trembling in the cab, and enhances the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the overall structure of an engine shutdown device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the specific structure of an engine shutdown device provided by an embodiment of the present invention; Figure 3 A flowchart of an engine shutdown method provided by an embodiment of the present invention; Figure 4 A schematic diagram of the connection between an engine stop device and a clutch provided by an embodiment of the present invention; Reference numerals: 1. Housing; 11. Piston chamber; 12. Air inlet; 2. Piston; 21. First shutdown assembly; 3. Intermediate shaft; 31. Second stop assembly; 4. Inflatable device; 5. Solenoid valve; 6. Return spring; 7. Top cover; 71. Tip. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, 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. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0018] An embodiment of the present invention provides an engine shutdown device to meet the requirements of smooth and rapid engine shutdown.

[0019] Figure 1 An engine shutdown device provided in an embodiment of the present invention includes: a housing 1, a piston 2, and an intermediate shaft 3 of a transmission. The housing 1 is provided with a piston chamber 11, and the piston 2 is disposed in the piston chamber 11. The piston 2 is axially movable, and a first shutdown assembly 21 is provided on the piston 2. The intermediate shaft 3 is coaxially arranged with the piston 2, and a second shutdown assembly 31 is provided on the intermediate shaft 3. When gas is inflated into the piston chamber 11, the piston 2 moves, driving the first shutdown assembly 21 to press against the second shutdown assembly 31 to brake the intermediate shaft, thereby subjecting the engine flywheel connected to the transmission clutch to reverse braking resistance, inhibiting the flywheel from rotating, and finally stopping it from rotating. When the gas is discharged from the piston chamber 11, the piston 2 moves, driving the first shutdown assembly 21 to disengage from the second shutdown assembly 31, releasing the intermediate shaft brake.

[0020] The engine stop device provided in the embodiment of the present invention comprises a housing, a piston, and an intermediate shaft of a gearbox. The housing is provided with a piston cavity, the piston is disposed in the piston cavity, the piston is movable in the axial direction, a first stop assembly is provided on the piston, the intermediate shaft is coaxially arranged with the piston and is connected to the clutch through the front auxiliary gear of the gearbox, see Figure 4As shown, a second parking assembly is provided on the intermediate shaft. When air is inflated into the piston cavity, the movement of the piston drives the first parking assembly to press the second parking assembly to brake the intermediate shaft, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, thereby suppressing the flywheel rotation and finally stopping it from rotating; when the gas is discharged from the piston cavity, the movement of the piston drives the first parking assembly to disengage from the second parking assembly, releasing the intermediate shaft brake, and the reciprocating movement of the piston in the piston cavity drives the first parking assembly to press or disengage from the second parking assembly, so that the braking force of the intermediate shaft is transmitted to the engine flywheel through the front auxiliary box gear and the clutch, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, thereby suppressing the flywheel rotation and finally stopping it from rotating, thereby smoothly stopping the engine, thereby improving the smoothness of engine shutdown, avoiding shaking or trembling of the cab, and improving the driving experience.

[0021] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the first stop assembly 21 is a plurality of steel plates, and the plurality of steel plates are arranged at intervals. The second stop assembly 31 is a plurality of friction plates, and the plurality of friction plates are arranged at intervals, and each friction plate is located between every two steel plates, and each steel plate is arranged at intervals with each friction plate. Each friction plate is connected to the intermediate shaft 3 through a spline. When the piston chamber 11 is inflated, the piston 2 moves axially to the left along the piston chamber 11, and the piston 2 drives the plurality of steel plates to move to the left and fit and press the plurality of friction plates. The friction plate brakes the intermediate shaft 3 under the action of friction force, and the braking force of the intermediate shaft 3 is transmitted to the clutch through the front auxiliary box gear of the transmission. Since the clutch and the engine flywheel are pressed tightly, the flywheel of the engine is subjected to reverse braking resistance, which inhibits the rotation of the flywheel and finally stops it from rotating, thereby achieving a smooth shutdown of the engine; when the gas in the piston chamber 11 is discharged, the piston 2 moves axially to the right along the piston chamber 11, and the piston 2 drives the multiple steel plates to separate from the friction plates, and the multiple friction plates and the intermediate shaft are released from constraints, further releasing the brake on the intermediate shaft.

[0022] As an optional implementation, in one embodiment of the invention, see Figure 2As shown, the engine shutdown device also includes: an inflation device 4, which is connected to an air inlet 12 provided at the top of the housing 1, and the air inlet 12 is connected to the piston chamber 11. When the engine needs to be shut down, the inflation device 4 is started to inflate the piston chamber 11 through the air inlet 12, and the gas pressure in the piston chamber 11 rises, pushing the piston 2 to move axially along the piston chamber 11; when the engine does not need to be shut down, the inflation device 4 stops inflating, the gas in the piston chamber 11 is discharged through the air inlet 12, the gas pressure in the piston chamber 11 drops, and the piston 2 moves back axially along the piston chamber 11.

[0023] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: a solenoid valve 5, which is arranged between the charging device 4 and the air inlet 12, and is used to adjust the opening of the air inlet 12. The solenoid valve 5 can control the on and off of the air inlet 12 and adjust the flow of gas entering the piston chamber 11. When the solenoid valve 5 is opened, the charging device 4 inflates the piston chamber 11 through the solenoid valve 5 and the air inlet 12. When the solenoid valve 5 is reversed, the gas in the piston chamber 11 is discharged through the solenoid valve 5 and the air inlet 12; the flow of gas entering the piston chamber 11 can also be increased or decreased by adjusting the opening of the solenoid valve 5, thereby adjusting the pressure in the piston chamber 11 and the pressing force between the multiple steel plates and the multiple friction plates.

[0024] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: a return spring 6, which is coaxially arranged with the intermediate shaft 3 and located at the top end of the intermediate shaft 3, and the top end of the return spring 6 is connected to the piston 2. When the piston chamber 11 is inflated, the piston 2 overcomes the resistance of the return spring 6 and moves axially to the left along the piston chamber 11 to compress the return spring 6, and the piston 2 drives the multiple steel plates to move to the left and fit and press with the multiple friction plates; when the gas in the piston chamber 11 is discharged, the return spring 6 pushes the piston 2 to move axially to the right along the piston chamber 11 to reset, so that the multiple steel plates can be quickly separated from the friction plates. The return spring 6 can absorb impact energy through elastic deformation, reduce mechanical vibration and component wear, and ensure the stability of the cyclic operation of the piston 2.

[0025] As an optional implementation, in one embodiment of the invention, see Figure 2As shown, the engine shutdown device also includes: a top sleeve 7, which is sleeved on the outside of the return spring 6, and the top end of the top sleeve 7 cooperates with the piston 2. The top sleeve 7 provides elastic support between the return spring 6 and the piston 2. When the gas in the piston chamber 11 is discharged, the return spring 6 pushes the piston 2 axially along the piston chamber 11 through the top sleeve 7 to reset. The top sleeve 7 is used for buffering and shock absorption to absorb impact force, reduce vibration of the vehicle body, compensate for the gap between the return spring 6 and the piston 2, and ensure the precise cooperation between the return spring 6 and the piston 2 in the reset movement. The top sleeve 7 also plays a guiding role and reduces wear, thereby extending the service life of the engine shutdown device of the embodiment of the present invention.

[0026] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, a tip 71 is provided at the top of the top sleeve 7, and the tip 71 abuts against the piston 2, and a round hole is further provided in the piston 2 to cooperate with the tip 71 and fit with the tip 71. The top sleeve 7 can better press the piston 2 with the tip 71 to enhance the tightening effect and achieve precise positioning: the tip 71 helps the top sleeve 7 to achieve precise positioning in the process of the return spring 6 resetting and tightening the piston 2, ensuring that the return spring 6 and the top sleeve 7 maintain a stable position. The design of the tip 71 can also improve the fitting force between the top sleeve 7 and the piston 2, and improve the load-bearing capacity and stability of the top sleeve 7.

[0027] The embodiment of the present invention also provides an engine shutdown method, see Figure 3 As shown, the following steps are included: Step S10, when the engine stop command is received, detecting the engine speed to determine whether the engine speed decreases; If yes, in step S20, the piston chamber 11 is inflated to move the piston 2, driving the first stop assembly 21 to press the second stop assembly 31 to start braking the intermediate shaft, and then determining whether the engine speed continues to decrease; In step S30, if the engine speed continues to decrease, continue to inflate the piston chamber 11 until the engine speed reaches zero, thereby completing the intermediate shaft braking. If the engine speed does not continue to decrease, discharge the gas in the piston chamber 11, causing the piston 2 to move and drive the first shutdown assembly 21 to disengage from the second shutdown assembly 31, thereby releasing the intermediate shaft braking.

[0028] The engine shutdown method according to the embodiment of the present invention is described in detail. Figure 3 and Figure 4As shown, during the engine shutdown process, the TCU receives the engine shutdown command and detects the engine speed. If the engine speed drops, the front auxiliary box gear is engaged through a control command, the main box is placed in neutral, the clutch is engaged, and the TCU issues a control command to inflate the piston cavity, so that the piston moves and drives the first shutdown component to press the second shutdown component to start braking the intermediate shaft; if the engine speed does not drop, the TCU continues to detect the engine speed until the engine speed drops; during the braking process, the engine speed change rate is continuously detected. If the engine speed continues to drop, the TCU issues a control command to continue to inflate the piston cavity until the engine speed reaches zero, completing the intermediate shaft braking; if the engine speed does not continue to drop, in order to prevent damage to the intermediate shaft, the TCU A control command is issued to discharge the gas in the piston chamber, so that the piston moves to drive the first shutdown component to disengage from the second shutdown component, releasing the intermediate shaft brake, and the reciprocating movement of the piston in the piston chamber drives the steel plate to press or disengage from the friction plate, so that the intermediate shaft braking force is transmitted to the engine flywheel through the front auxiliary box gear and the clutch, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, which inhibits the flywheel rotation and finally stops it from rotating, thereby stopping the engine smoothly. The engine shutdown process is smoother, the speed reduction rate is significantly improved, the engine shutdown time is shorter, and in the final stage of the engine shutdown, there is no engine reversal. The entire shutdown and flameout process is smooth and fast, without causing shaking or trembling in the cab, thereby improving the driving experience.

[0029] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, if the engine speed continues to decrease, the piston chamber 11 continues to be inflated until the engine speed reaches zero, thereby completing the intermediate shaft braking, including: increasing the air flow rate inflated into the piston chamber 11, increasing the air flow rate entering the piston chamber 11 by increasing the opening of the solenoid valve 5, thereby increasing the pressure in the piston chamber 11 and the clamping force between the multiple steel plates and the multiple friction plates, so that the engine speed drops rapidly to zero, thereby completing the intermediate shaft braking.

[0030] An embodiment of the present invention also provides an automobile, using the above-mentioned engine shutdown device, the engine device includes: a housing 1, a piston 2, and an intermediate shaft 3 of a transmission. A piston chamber 11 is provided in the housing 1, and the piston 2 is provided in the piston chamber 11. The piston 2 can move axially, and a first shutdown component 21 is provided on the piston 2. The intermediate shaft 3 is coaxially arranged with the piston 2, and a second shutdown component 31 is provided on the intermediate shaft 3. When gas is inflated into the piston chamber 11, the piston 2 moves to drive the first shutdown component 21 to press the second shutdown component 31 to brake the intermediate shaft, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, which inhibits the flywheel from rotating and finally stops rotating. When the gas is discharged from the piston chamber 11, the piston 2 moves to drive the first shutdown component 21 to disengage from the second shutdown component 31, thereby releasing the intermediate shaft brake.

[0031] The engine stop device of the automobile provided in the embodiment of the present invention comprises a housing, a piston, and an intermediate shaft of the transmission. The housing is provided with a piston cavity, the piston is disposed in the piston cavity, the piston is movable in the axial direction, a first stop assembly is provided on the piston, the intermediate shaft is coaxially arranged with the piston and is connected to the clutch through the front auxiliary gear of the transmission, see Figure 4 As shown, a second parking assembly is provided on the intermediate shaft. When air is inflated into the piston cavity, the movement of the piston drives the first parking assembly to press the second parking assembly to brake the intermediate shaft, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, thereby suppressing the flywheel rotation and finally stopping it from rotating; when the gas is discharged from the piston cavity, the movement of the piston drives the first parking assembly to disengage from the second parking assembly, releasing the intermediate shaft brake, and the reciprocating movement of the piston in the piston cavity drives the first parking assembly to press or disengage from the second parking assembly, so that the braking force of the intermediate shaft is transmitted to the engine flywheel through the front auxiliary box gear and the clutch, so that the engine flywheel connected to the transmission clutch is subjected to reverse braking resistance, thereby suppressing the flywheel rotation and finally stopping it from rotating, thereby smoothly stopping the engine, thereby improving the smoothness of engine shutdown, avoiding shaking or trembling of the cab, and improving the driving experience.

[0032] As an optional implementation, in one embodiment of the invention, see Figure 2As shown, the first stop assembly 21 is a plurality of steel plates, and the plurality of steel plates are arranged at intervals. The second stop assembly 31 is a plurality of friction plates, and the plurality of friction plates are arranged at intervals, and each friction plate is located between every two steel plates, and each steel plate is arranged at intervals with each friction plate. Each friction plate is connected to the intermediate shaft 3 through a spline. When the piston chamber 11 is inflated, the piston 2 moves axially to the left along the piston chamber 11, and the piston 2 drives the plurality of steel plates to move to the left and fit and press the plurality of friction plates. The friction plate brakes the intermediate shaft 3 under the action of friction force, and the braking force of the intermediate shaft 3 is transmitted to the clutch through the front auxiliary box gear of the transmission. Since the clutch and the engine flywheel are pressed tightly, the flywheel of the engine is subjected to reverse braking resistance, which inhibits the rotation of the flywheel and finally stops it from rotating, thereby achieving a smooth shutdown of the engine; when the gas in the piston chamber 11 is discharged, the piston 2 moves axially to the right along the piston chamber 11, and the piston 2 drives the multiple steel plates to separate from the friction plates, and the multiple friction plates and the intermediate shaft are released from constraints, further releasing the brake on the intermediate shaft.

[0033] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: an inflation device 4, which is connected to an air inlet 12 provided at the top of the housing 1, and the air inlet 12 is connected to the piston chamber 11. When the engine needs to be shut down, the inflation device 4 is started to inflate the piston chamber 11 through the air inlet 12, and the gas pressure in the piston chamber 11 rises, pushing the piston 2 to move axially along the piston chamber 11; when the engine does not need to be shut down, the inflation device 4 stops inflating, the gas in the piston chamber 11 is discharged through the air inlet 12, the gas pressure in the piston chamber 11 drops, and the piston 2 moves back axially along the piston chamber 11.

[0034] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: a solenoid valve 5, which is arranged between the charging device 4 and the air inlet 12, and is used to adjust the opening of the air inlet 12. The solenoid valve 5 can control the on and off of the air inlet 12 and adjust the flow of gas entering the piston chamber 11. When the solenoid valve 5 is opened, the charging device 4 inflates the piston chamber 11 through the solenoid valve 5 and the air inlet 12. When the solenoid valve 5 is reversed, the gas in the piston chamber 11 is discharged through the solenoid valve 5 and the air inlet 12; the flow of gas entering the piston chamber 11 can also be increased or decreased by adjusting the opening of the solenoid valve 5, thereby adjusting the pressure in the piston chamber 11 and the pressing force between the multiple steel plates and the multiple friction plates.

[0035] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: a return spring 6, which is coaxially arranged with the intermediate shaft 3 and located at the top end of the intermediate shaft 3, and the top end of the return spring 6 is connected to the piston 2. When the piston chamber 11 is inflated, the piston 2 overcomes the resistance of the return spring 6 and moves axially to the left along the piston chamber 11 to compress the return spring 6, and the piston 2 drives the multiple steel plates to move to the left and fit and press with the multiple friction plates; when the gas in the piston chamber 11 is discharged, the return spring 6 pushes the piston 2 to move axially to the right along the piston chamber 11 to reset, so that the multiple steel plates can be quickly separated from the friction plates. The return spring 6 can absorb impact energy through elastic deformation, reduce mechanical vibration and component wear, and ensure the stability of the cyclic operation of the piston 2.

[0036] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the engine shutdown device also includes: a top sleeve 7, which is sleeved on the outside of the return spring 6, and the top end of the top sleeve 7 cooperates with the piston 2. The top sleeve 7 provides elastic support between the return spring 6 and the piston 2. When the gas in the piston chamber 11 is discharged, the return spring 6 pushes the piston 2 axially along the piston chamber 11 through the top sleeve 7 to reset. The top sleeve 7 is used for buffering and shock absorption to absorb impact force, reduce vibration of the vehicle body, compensate for the gap between the return spring 6 and the piston 2, and ensure the precise cooperation between the return spring 6 and the piston 2 in the reset movement. The top sleeve 7 also plays a guiding role and reduces wear, thereby extending the service life of the engine shutdown device of the embodiment of the present invention.

[0037] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, a tip 71 is provided at the top of the top sleeve 7, and the tip 71 abuts against the piston 2, and a round hole is further provided in the piston 2 to cooperate with the tip 71 and fit with the tip 71. The top sleeve 7 can better press the piston 2 with the tip 71 to enhance the tightening effect and achieve precise positioning: the tip 71 helps the top sleeve 7 to achieve precise positioning in the process of the return spring 6 resetting and tightening the piston 2, ensuring that the return spring 6 and the top sleeve 7 maintain a stable position. The design of the tip 71 can also improve the fitting force between the top sleeve 7 and the piston 2, and improve the load-bearing capacity and stability of the top sleeve 7.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0040] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features of the present invention.

Claims

1. An engine shutdown device, characterized in that: include: A housing (1), wherein a piston chamber (11) is provided in the housing (1); A piston (2), the piston (2) being disposed in the piston cavity (11), the piston (2) being movable in the axial direction, and a first shutdown assembly (21) being provided on the piston (2); An intermediate shaft (3) of the gearbox, the intermediate shaft (3) being coaxially arranged with the piston (2), and a second shutdown assembly (31) being provided on the intermediate shaft (3); When air is inflated into the piston chamber (11), the piston (2) moves to drive the first stop assembly (21) to press the second stop assembly (31) to brake the intermediate shaft, thereby stopping the rotation of the engine flywheel connected to the transmission clutch; When the gas is discharged from the piston chamber (11), the piston (2) moves to drive the first stop assembly (21) to disengage from the second stop assembly (31), thereby releasing the intermediate shaft brake.

2. The engine stop device according to claim 1, characterized in that: The first stop assembly (21) comprises a plurality of steel plates, which are arranged at intervals; the second stop assembly (31) comprises a plurality of friction plates, which are arranged at intervals, and each friction plate is located between every two steel plates.

3. The engine stopping device according to claim 1, characterized in that: Also includes: An air filling device (4), wherein the air filling device (4) is connected to an air inlet (12) provided at the top end of the housing (1), and the air inlet (12) is connected to the piston chamber (11).

4. The engine stopping device according to claim 3, characterized in that: Also includes: A solenoid valve (5) is provided between the inflation device (4) and the air inlet (12) and is used to adjust the opening of the air inlet (12).

5. The engine stopping device according to claim 1, wherein: Also includes: A return spring (6) is coaxially arranged with the intermediate shaft (3) and located at the top end of the intermediate shaft (3), and the top end of the return spring (6) is connected to the piston (2).

6. The engine stopping device according to claim 5, characterized in that: Also includes: A top sleeve (7), the top sleeve (7) is sleeved on the outside of the return spring (6), and the top end of the top sleeve (7) is matched with the piston (2).

7. The engine stop device according to claim 6, characterized in that: A tip (71) is provided at the top end of the top sleeve (7), and the tip (71) abuts against the piston (2).

8. An engine shutdown method, characterized in that: The engine stopping device according to claim 1 comprises: When receiving the engine stop command, the engine speed is detected to determine whether the engine speed decreases; If so, the piston chamber (11) is inflated to move the piston (2) to drive the first stop assembly (21) to press the second stop assembly (31) to start braking the intermediate shaft, and then determine whether the engine speed continues to decrease; If the engine speed continues to decrease, the piston chamber (11) is continuously inflated until the engine speed reaches zero, thereby completing the engine shutdown. If the engine speed does not continue to decrease, the gas in the piston chamber (11) is discharged, causing the piston (2) to move and drive the first shutdown assembly (21) to disengage from the second shutdown assembly (31), thereby releasing the intermediate shaft brake.

9. The engine shutdown method according to claim 8, characterized in that: If the engine speed continues to decrease, the piston chamber (11) is continuously charged with air until the engine speed reaches zero, thereby completing the engine shutdown, including: Increase the amount of air that is inflated into the piston chamber (11).

10. An automobile, characterized in that: Use the engine stop device according to claim 1.

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