7432 results about "Clutch" patented technology

The invention discloses a multi-mode energy recovery optimization control system of a hybrid electric vehicle, and relates to the technical field of energy recovery control. The state sensing module is integrated with a sensor to collect vehicle speed, acceleration, battery state and road condition signals, and data accuracy is ensured through Kalman filtering fusion; the driving mode recognition module is used for recognizing modes such as urban congestion and high-speed cruise through an algorithm based on driving behaviors and road conditions; the energy recovery strategy decision module is used for dynamically adjusting recovery priorities and parameters according to different modes, and balancing efficiency and smoothness; the power distribution execution module converts and stores energy through cooperative control of double clutches and a gearbox, and is linked with an ABS (Anti-lock Brake System) to guarantee safety; and the feedback module is optimized in real time, battery and motor states are monitored, strategies are dynamically corrected, and efficiency and component protection are both considered. The energy recovery efficiency is improved, the driving smoothness and the braking safety are improved, the system adapts to multiple scenes, the service life of the battery is prolonged, and the performance of the hybrid electric vehicle is comprehensively improved.

The invention provides a gear switching method, a vehicle and a storage medium, the method is applied to the technical field of hybrid power control, and the method comprises the steps that in the process that the vehicle runs based on a direct drive mode, if it is determined that the vehicle needs to switch gears, the whole vehicle driving power corresponding to the direct drive mode and the discharging power of a power battery are determined; based on the whole vehicle driving power, the discharging power and the gear change state of the vehicle, a target torque reduction gradient is determined; based on the target torque reduction gradient, the actual torque of the engine is controlled to be reduced to the target torque; and under the condition that the actual torque of the engine is equal to the target torque, the clutch is controlled to be in an open state, so that the vehicle is shifted under the condition that the clutch is in the open state. The method can ensure that the power is not interrupted in the vehicle gear shifting process, the vehicle stability is improved, and the user driving experience is improved.

An electronic control clutch structure of an actuator device having a driver, a cam, a clutch wheel, and a transmission wheel is provided. The cam is connected to the driver, is driven by thereof, and includes a first actuating portion and a second actuating portion. The clutch wheel is connected to the rotating draft, rotates with thereof, and is arranged atop on the cam. The cam operatively actuates the clutch wheel. The transmission wheel is connected to the rotating draft. The clutch wheel and the transmission wheel are in a detached state when the clutch wheel is located on the first actuating portion. The clutch wheel and the transmission wheel are in an embedded state when the clutch wheel is located on the second actuating portion. The electronic control clutch structure may adapt uneven areas in the grass to perform weeding work according to the terrain changes of the grassland.

The invention provides a multifunctional cycle power generation system and method by a gravity lever. The system comprises a supporting rack and a balance weight arranged on the supporting rack and slidably matched with the supporting rack, wherein engines are arranged on one side or two sides of the balance weight; the input shaft of each engine is connected to a transmission shaft; two or more single-directional clutches are fixedly connected to the middle of the transmission shaft; the locking directions of the single-directional clutches are same, gears are fixed to the peripheries of thesingle-directional clutches, and a rack matched with each gear to drive the transmission shaft to rotate is arranged next to each single-directional clutch; at least one pair of racks is arranged on the upper part and the lower part, separately, the racks and the balance weight which reciprocates are in driving movement and the balance weight is arranged on the supporting rack to swing through a lifting mechanism in a reciprocating manner. As the balance weight which swings in the reciprocating manner pulls the racks to drive the transmission shaft to rotate in the single direction, multiple engines can be driven synchronously to generate electricity synchronously, and the power needed by a supporting rack lifting device is alleviated greatly by means of a swing mode like to a lever, so that the energy sources are saved and the power generation efficiency is improved greatly.

A torque protection apparatus comprising: a gearbox coupled to an axle; an output ring with first and second planar disc surfaces coupled to the gearbox output; an outer body surrounding these components; an output adaptor attached to the outer body; an inner body within the outer body; a first clutch friction plate between the output adaptor and first planar disc surface; fluid in a chamber between the inner body and outer body; and a hydraulic pressure mechanism. The pressurized fluid pushes the inner body toward the output ring, pressing the output ring against the clutch friction plate. This creates friction causing the outer body to rotate with the axle until rotational torque exceeds a predetermined threshold, at which point the clutch friction plate slides against the disc surface, protecting the gearbox from excessive torque.

This invention discloses a press-to-rebound damping slide rail, belonging to the field of slide rail technology. The press-to-rebound damping slide rail of this invention includes a slide rail assembly and a press-to-rebound damping device. The slide rail assembly includes a fixed rail and a movable rail. The gearbox of the press-to-rebound damping device is equipped with a transmission gear and a clutch mechanism that mesh with a rack on the movable rail. In the first position, the gearbox has a rebound spring and a self-closing spring stretched and stored energy, and the gearbox is locked in the base. In the first position, the trigger part of the trigger transmission block is pushed by the trigger plate on the movable rail, causing the gearbox to unlock and rebound to the second position. The clutch mechanism locks the reverse rotation of the transmission gear and drives the rack and movable rail to rebound and move together. This invention organically combines the press-to-rebound mechanism and the damping closing mechanism, ensuring that the stability of their cooperation is not reduced by factors such as installation errors, making assembly simpler and more convenient, and guaranteeing product consistency.

A positive drive differential assembly including a differential with an input pinion configured to operably engage with a drive shaft so as to permit the drive shaft to rotate the pinion. A bi-directional overrunning clutch assembly is configured to transmit torque between the pinion and two drive axle segments. A pinion disconnect assembly is provided for controlling transmission of rotation to the pinion and including a rotary coupler. A linear actuator is connected to the rotary coupler and configured to translate the rotary coupler between connected and disconnected positions.

A dynamic reference base (DRB) and associated method are provided for rigidly affixing an array frame to bone for use in navigated or robotic surgery. The DRB includes a bridge element that includes a connecting rod having a distal end and a proximal end; a clamp coupled to the distal end of the connecting rod; a first and a second pin guide extending distally from the clamp; a locking nut disposed on the clamp; and a clutch coupled to the proximal end of the connecting rod, the clutch being adapted to couple to the array frame. The DRB also includes the array frame, which is couplable to the clutch, and is adapted to include a plurality of tracking markers disposed thereon.

A caravan lock with anti-motor stalling linkage structure is equipped with a toothed clutch mechanism or a ratchet clutch mechanism. The toothed clutch mechanism is featured by a rotary sliding tooth disc and an inner tooth disc, the drive shaft of the rotary shaft motor is connected to the inner tooth disc of the rotary sliding tooth disc, and the surface of the inner tooth disc has evenly spaced holes allowing for elastic deformation. The outer diameter of the internal gear disc features a braking head wedged into the internal tooth grooves evenly spaced along the inner diameter of the rotary sliding tooth disc; while the end of the linkage is pivotally attached to the first pin located at the top of the rotary sliding tooth disc, the second pin at the top of the rotary sliding gear disk is inserted into the sliding hole of the small locking tongue.

The invention discloses a double-clutch variable-stiffness knee joint exoskeleton, and relates to the technical field of wearable lower limb exoskeletons.The double-clutch variable-stiffness knee joint exoskeleton comprises a gait sensing module arranged outside and a limb connecting arm module used for being connected with a human body, and an energy storage module is installed on one side of the limb connecting arm module; a sensor module is mounted on the other side of the limb connecting arm module; the limb connecting arm module comprises a limb connecting arm assembly I used for being connected with the thigh of the human body and a limb connecting arm assembly II used for being connected with the shank of the human body, the limb connecting arm assembly I and the limb connecting arm assembly II are each provided with a clutch unit, and the core speed increaser is installed between the limb connecting arm assembly I and the limb connecting arm assembly II. The energy storage module and the sensor module are arranged on the two sides of the core speed increaser, and the core speed increaser is connected with the energy storage module. The device has the advantages of compact structure, variable rigidity bandwidth and good motion adaptability, can realize high energy recovery efficiency in a multi-gait mode, and reduces the metabolic consumption of a human body.

A motorcycle that inhibits damage to a transmission and a clutch. The motorcycle includes: a drive motor; a transmission; a clutch that connects or disconnects power transmission between the transmission and the drive motor; a mechanical oil pump that is driven by the drive motor to supply a coolant to the drive motor and the transmission; and a control portion that drives the drive motor to supply the coolant to the drive motor and the transmission if an accelerator operation is not detected and a neutral state is detected, or if an accelerator operation is not detected and a disconnected state of the clutch is detected.

The invention relates to the technical field of test devices, in particular to a central clutch test device and test method.The top of a base of the test device is connected with a left side supporting plate and a right side supporting plate which are parallel and oppositely arranged left and right, and two parallel supporting shafts are fixedly connected between the left side supporting plate and the right side supporting plate; a middle supporting plate is connected between the two supporting shafts in a sliding mode and can slide along the supporting shafts. The right side of the left supporting plate is connected with a clutch cover assembly connecting disc; the left side of the middle supporting plate is connected with a central clutch mounting disc; a lead screw parallel to the supporting shaft is connected between the middle supporting plate and the right supporting plate, the left end of the lead screw penetrates through the middle supporting plate, and the middle supporting plate is rotationally connected through a bearing; the screw rod section of the lead screw is in threaded connection with the threaded hole of the right supporting plate. According to the invention, the central clutch and the clutch cover assembly can be separated from the gearbox, the clutch actuating mechanism is independently detected, the test efficiency is higher, and the test device is simple in structure.

The invention discloses a single-motor two-gear coaxial electric drive axle structure, a vehicle and a working method, solves the problems of mass center offset and large occupied space of an electric drive axle in the prior art, and has the beneficial effects of being compact in structure, high in integration level and convenient to arrange. Comprising a first half shaft and a second half shaft, the first half shaft and the second half shaft are connected through a differential mechanism, a driving motor is arranged around the first half shaft and is a hollow shaft motor, an output shaft of the driving motor is connected with a first planet row, and a first planet carrier in the first planet row is fixedly connected with driving discs of at least two clutches; driven discs of the clutches are fixedly connected with sun gears in the second planet row respectively, the sun gears are meshed with the corresponding planet gears, one planet gear is meshed with the corresponding gear ring, all the planet gears in the second planet row are connected and arranged on the second planet carrier in a sleeved mode, and the first planet row and the second planet row both take the first half shaft as the rotation center.

A computer system has processing circuitry to selectively operate the powertrain system in at least a freewheeling mode, in which an output shaft of the engine is non-rotating, and the engine is disconnected from the one or more drive wheels. The processing circuitry is further configured to: determine an opportunity for the freewheeling mode by predicting a feasibility of restarting the engine along an intended route by using a controllable clutch. Predicting the feasibility of restarting the engine by using the controllable clutch includes determining fulfillment of any one of a first restarting condition and a second restarting condition. Determining fulfillment of the first restarting condition includes comparing current total weight of the vehicle with a threshold value indicative of a minimum total weight for avoiding excessive braking of the vehicle during restarting at a high friction road condition with a given total gear ratio. Determining fulfillment of the second restarting condition includes comparing a current drive axle load with a corresponding threshold value indicative of a minimum drive axle load on a drive axle for avoiding excessive wheel slip during restarting at a low friction road condition with a given total gear ratio. The powertrain system is controlled into the freewheeling mode upon the fulfillment of any one of the first restarting condition and the second restarting condition.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The invention provides an obstacle crossing mechanism, a trigger assembly, a clutch assembly, a walking module and cleaning equipment. The obstacle crossing mechanism comprises a mounting shell, a trigger assembly, a clutch assembly and an obstacle crossing piece. The trigger assembly is elastically hinged to the installation shell and comprises a trigger piece and a joint control piece, the trigger piece extends out of the lower side of the installation shell, and the joint control piece is fixedly connected to the trigger piece. The clutch assembly comprises a transmission shaft, a driving part and a clutch part, the transmission shaft is rotationally connected to the mounting shell, and the driving part is rotationally connected to the transmission shaft. The clutch piece is fixedly connected with the transmission shaft in the circumferential direction of the transmission shaft and movably connected with the transmission shaft in the circumferential direction of the transmission shaft. The obstacle crossing piece is fixedly connected to the transmission shaft. When an obstacle pushes the trigger piece, the trigger piece drives the joint control piece to rotate forwards, so that the joint control piece pushes the clutch piece to be in transmission connection with the driving piece. Therefore, the cost is reduced, and the stable obstacle crossing effect is guaranteed.

This disclosure is directed to a driving device for driving a swing member which has a driving power source, a power transmission assembly driven by the driving power source, a screw assembly and a clutch assembly arranged between the power transmission assembly and the screw assembly. The screw assembly has a nut and a screw rod screwed with each other. The screw rod has an end connected with the swing member. The nut can be operated by the clutch assembly to connected to or release the power transmission assembly. When the nut is connected to the power transmission assembly, the power transmission assembly is driven by the driving power source, so that the nut is driven by the power transmission assembly to move the screw rod and allow the swing member to be operated by an external force in any status during a power-driven operation of opening or closing.

The present disclosure discloses a door opening and closing device including a drive mechanism (100), an interlocking gear (300), a clutch (200), and a door rotation mechanism (400), wherein the interlocking gear (300) is rotatably mounted on a base (900), the clutch (200) is mounted between the drive mechanism (100) and the interlocking gear (300) and serves to selectively rotatably connect the drive mechanism (100) and the interlocking gear (300), the door rotation mechanism (400) is connected at one end to the interlocking gear (300) and at the other end to a door body (13), and the door push-up mechanism (500) is connected to the interlocking gear (300) and serves to push up the door body (13). An electrical device including the door opening and closing device is also provided. The door opening and closing device can at least partially solve the technical problem of electrical devices, which have great difficulty in opening and closing doors and are inconvenient to use.

The invention provides a clutch abnormity detection method and device, and relates to the field of clutch state monitoring and fault diagnosis, and the method comprises the steps: obtaining the monitoring parameters of the operation state of a clutch; performing signal filtering and characteristic quantity extraction on the monitoring parameters to obtain characteristic quantities corresponding to the monitoring parameters; comparing each characteristic quantity with an abnormal threshold value configured in a corresponding operation mode, and determining whether a parameter abnormality and a corresponding target abnormal parameter type exist or not; and determining a target clutch fault type corresponding to the target abnormal parameter type based on the corresponding relationship between the configured different abnormal type combinations and different clutch fault types. According to the method, the accuracy and reliability of state monitoring are remarkably improved, and a key decision basis is provided for predictive maintenance.

The invention provides a mode switching method, a vehicle and a storage medium, the method is applied to the technical field of hybrid power control, and the method comprises the steps that under the condition that a control instruction for switching a driving mode of the vehicle from a direct driving mode to a series connection mode is received, the direct driving mode is switched to the series connection mode; the method comprises the following steps: determining the discharge power of a power battery of a vehicle and the whole vehicle driving power of the vehicle, determining a target interval where the whole vehicle driving power is located based on the discharge power of the power battery and the whole vehicle driving power, determining a target torque reduction gradient corresponding to the target interval, and then determining the torque reduction speed of the vehicle based on the target torque reduction gradient. And the actual torque of the engine is controlled to be reduced to the target torque, and under the condition that the actual torque of the engine is equal to the target torque, the clutch is controlled to be in an open state, so that the driving mode of the vehicle is switched to the series connection mode from the direct drive mode. According to the method, the torque can be reduced gently, and power interruption caused by the fact that the engine torque is directly reduced to zero is avoided.

The utility model discloses a lockset with an improved back locking structure, which comprises a first fixing component and a spring bolt, the first fixing component is provided with a first handle, the first handle drives the spring bolt to perform unlocking action through a locking bar, the first handle comprises a handle seat movably provided with a key, one side, facing the locking bar, of the key is movably provided with a lock pin, and the first fixing component is provided with a lock hole. The lock bar is provided with a through hole, the handle seat is provided with a receding hole, the handle seat and the key are matched through a clutch structure, the first handle has a back locking state and a normal state, the handle seat and the lock bar are in transmission connection in a clearance fit mode, the back locking state is achieved, the lock bar and the first fixing assembly are relatively fixed by the lock pin after the key is pressed down, and the normal state is achieved. The handle base rotates by a first preset angle, clearance fit is eliminated, back locking is relieved, and the handle base continues to rotate by a second preset angle to drive the lock bar to rotate. Unlocking and unlocking processes after back locking of the lock are realized through seamless connection and rotation of the first handle, and the lock is smooth and simple to operate and easy to use.

The invention relates to the field of automobile alternating-current generators, and discloses a high-power alternating-current generator which comprises a machine shell, a rear end cover arranged behind the machine shell and a built-in machine shaft. A heat dissipation hole is formed in the rear end cover, a rotating block with a first fan blade is arranged in the hole, and the rotating block is rotationally installed on a supporting frame fixed to the rear end cover; a connecting groove is formed in the transmission shaft, the main shaft is inserted into the groove and is in transmission connection with the groove, and two ends of memory alloy in the groove are fixedly connected with the main shaft and the transmission shaft; the rotating block and the transmission shaft are in clutch transmission through the second butt joint assembly. A sliding sleeve with a second fan blade is arranged between the first fan blade and the second fan blade, is provided with a through hole and is in clutch transmission with the transmission shaft through a first butt-joint assembly; the sliding sleeve is provided with a groove, the rotating block is rotatably provided with a connecting rotating ring, the connecting rotating ring is fixedly connected with a supporting rod, and the supporting rod is inserted into the inserting groove. A mechanism for driving the transmission shaft to move is arranged between the transmission shaft and the sliding sleeve. After the temperature in the alternating-current generator rises, the transmission shaft drives the rotating block and the first fan blade through the second butt joint assembly, the two fan blades are stacked for heat dissipation, and the high-temperature requirement is met.

The utility model discloses a stainless steel composite board surface polishing device which comprises an installation frame, the installation frame is horizontally and rotatably connected with a driving shaft, and the installation frame is further fixedly connected with a motor in transmission connection with the driving shaft. The multiple driving wheels are distributed in the axial direction of the driving shaft at equal intervals, all the driving wheels are connected with the driving shaft through connecting bearings, and clutch mechanisms are arranged between all the driving wheels and the driving shaft; the driven wheel is connected with the mounting frame through a lifting mechanism, and an abrasive belt is arranged between the driving wheel and the driven wheel; and the tensioning wheel is arranged on the inner side of the abrasive belt and is in rolling connection with the abrasive belt, and the tensioning wheel is connected with the mounting frame through an elastic piece. The polishing device is provided with a plurality of abrasive belts of different models, and different abrasive belts can be switched to be used through the lifting mechanism and the clutch mechanism, so that the time for replacing the abrasive belts is saved, and the machining efficiency of the device is improved; the multiple abrasive belts are used at the same time, the grinding range of the grinding device can be enlarged, and the grinding efficiency is improved.

The invention provides an internal flow field balancing device for a magnetic transmission high-temperature and high-pressure closed container. Comprising a pulley, a transmission mechanism, a clutch, a turbulent flow mechanism, a frequency modulation motor and a magnetic transmission mechanism, a rotating cage is arranged on the pulley and is driven to rotate through a rotating mechanism; a tray is hung on the rotating cage, and an accommodating object is accommodated on the tray; the transmission mechanism is arranged at the closed end of the tank body; one end of the clutch is connected with the transmission mechanism; the turbulence mechanism is provided with a transmission shaft, blades and a driving gear are arranged at the extension end of the transmission shaft, the blades are used for adjusting airflow distribution in the tank body, and the driving gear is connected with the input end of the transmission mechanism and used for driving the transmission mechanism; the magnetic transmission mechanism is a non-contact coupling for transmitting torque through magnetic field force, is arranged in the middle of the outer side of the sealing head at the closed end of the tank body and transmits torque to the closed space of the tank body; the frequency modulation motor is connected with the magnetic transmission mechanism and used for driving the transmission shaft to rotate. Three flow field balancing modes are provided for use.

A hybrid system for use with utility vehicles includes an electric motor including an output shaft and a conductor configured to alternatively receive power from or send power to an electrical power source. The hybrid system includes an internal combustion engine, a first pulley connected to and rotated by the internal combustion engine, and a clutch mechanism. The clutch mechanism includes a ratchet connected to the output shaft of the electric motor to rotate at a first rotational speed, a pawl carrier driven by the internal combustion engine to rotate at a second rotational speed, and one or pawls coupled to and configured to rotate with the pawl carrier. The one or more pawls are configured to be disengaged from the ratchet when the first and second rotational speeds differ and engaged with the ratchet when the first and second rotational speeds are equal.

Various embodiments of a trash can assembly (e.g., a receptacle configured to receive refuse, recycleable materials, or otherwise), and related methods, are provided. Some embodiments of the trash can assembly include a body component and a lid configured to move between an open position and a closed position. In some variants, the lid can be moved between the open and closed positions by a power operated driving mechanism, such as a motor and / or other drivetrain components. In certain embodiments, the trash can assembly includes a clutch mechanism to facilitate manual operation of the lid while inhibiting or preventing damage to the motor and / or other drivetrain components.

The invention relates to the technical field of extrusion casting molds, and discloses an automobile clutch shell extrusion casting mold which comprises a casting table base, a supporting column is fixedly connected to the top of the casting table base, a top hydraulic machine box is fixedly connected to the top of the supporting column, and a first hydraulic telescopic column is movably connected into the top hydraulic machine box in a sleeved mode. A mold base is arranged at the bottom of the first hydraulic telescopic column, the mold base is movably sleeved with an extrusion cooling table, a cold air conveying channel is formed in the bottom of the mold base, a first fan blade is movably sleeved with the mold base, and a first motor is fixedly connected to the bottom of the first fan blade; low temperature generated by cooling liquid is transmitted to the mold base to cool the mold base, the front ventilation pipeline arranged in the concave water tank in a sleeving mode converts internal airflow into low-temperature airflow through cooling liquid, and the water tank handrail is installed outside the concave water tank to prevent foreign matter from entering the concave water tank to affect the cooling effect of the front ventilation pipeline.

An electric cylinder (10) with a reminder function and a quick-release structure (2) thereof. The electric cylinder (10) includes a worm wheel (21). The quick-release structure (2) includes a clutch (22), a clutch plate (23), a linkage rod component (3), a position sensor (4), and an alarm (5). The clutch plate (23) is connected to the worm wheel (21). The linkage rod component (3) includes a pullable part (31) disposed on one end thereof. The linkage rod component (3) includes a sliding block (32) disposed between the pullable part (31) and the clutch plate (23). The position sensor (4) is disposed corresponding to the sliding block (32), and configured to sense a movement of the sliding block (32) and generate a displacement signal. The alarm (5) is configured to receive the displacement signal and send a warning.

The spring operating device comprises a front plate, a middle plate and a rear plate which are sequentially arranged from outside to inside, a first cavity is defined by the front plate and the middle plate, a second cavity is defined by the middle plate and the rear plate, and the spring operating device comprises an electric-manual energy storage mechanism fixedly installed on the front plate; the energy storage shaft penetrates through the front plate and the middle plate; the energy storage clutch mechanism is positioned in the first cavity; and the output shaft penetrates through the first cavity and the second cavity, and when the cam of the energy storage shaft drives the cam roller to act, the output shaft rotates to enable the mechanism output connecting rod to actuate the circuit breaker to be closed and enable the opening spring on the opening spring guide rod to store energy. Compared with the prior art, the spring operating device for the circuit breaker has the advantages of simplified assembly and high function integration level.

The invention relates to the technical field of AMT gearbox control, in particular to an AMT gearbox control method, system and equipment in a braking state and a medium, and the method comprises the steps that when a vehicle is in a braking deceleration state, the stepping duration of a brake pedal, the actual vehicle speed, the actual acceleration of the vehicle and the rotating speed of an engine are obtained; whether the braking intention of the driver is emergency braking or stable braking is judged based on the stepping duration of the brake pedal and the actual acceleration of the vehicle; and based on the braking intention, the gear of the AMT gearbox and the separation state of a clutch are controlled till braking is finished. Wherein the current gear is maintained during emergency braking, and a clutch is controlled to be separated according to an engine rotating speed threshold value; during stable braking, after the rotating speed of the engine meets the condition, whether downshift is conducted or not is judged according to the actual vehicle speed, and a clutch is controlled to be separated. The brake intention of a driver can be accurately recognized, differential control is executed, and therefore the brake efficiency is effectively improved, engine flameout is prevented, and the driving smoothness is improved.