854 results about "Transmission ratio" patented technology

The invention discloses a gear shifting gearbox and an asynchronous rolling mill, and relates to the technical field of rolling equipment. The transmission mechanism comprises a main transmission shaft, a first output shaft and a second output shaft, the main transmission shaft, the first output shaft and the second output shaft can be rotationally installed in the box body along the axes of the main transmission shaft, the first output shaft and the second output shaft are driven by the main transmission shaft to rotate, and the rotation directions of the first output shaft and the second output shaft are opposite; the gear shifting mechanism comprises a wheel disc and a plurality of first gear sets, the wheel disc can rotate around the axis of the wheel disc to be connected to the main transmission shaft, the first gear sets are arranged on one end face in the wheel disc, all the first gear sets are in transmission connection with the main transmission shaft, and different first gear sets are switched through rotation of the wheel disc to be in transmission connection with the first output shaft; the main transmission shaft is in transmission connection with the first output shaft through one of the multiple first gear sets, the transmission ratios of the first gear sets are different, and multiple rotation speed ratios exist between the first output shaft and the second output shaft.

The invention discloses a winding drum rope arranging device which comprises a winding drum base, a winding drum, a gear transmission mechanism, a lead screw, a swing roller assembly, a convex shaft and a reversing assembly. The reversing assembly comprises a power assembly and a reversing clutch assembly. The gear transmission mechanism and the lead screw convert rotary motion of the winding drum into linear motion of the swing roller assembly, so that the winding drum moves along with the rope coiling position. When the winding drum is full of one layer, the swing roller assembly reaches the limit deviation position to drive the protruding shaft to rotate, the power assembly amplifies the rotation angle and conducts one-way transmission, and the reversing clutch assembly changes the rotation direction of the lead screw to achieve reversing. A pure mechanical structure is adopted, a sensor and an electric control system are not needed, reliability is high, and cost is low; the swing roller assembly reduces abrasion of the steel wire rope and limits the support to guarantee accurate movement; rope arrangement synchronization is achieved through the transmission ratio design, the reversing assembly has the precise reversing function and the torque protection function, the rope disorder and rope sinking phenomena can be effectively avoided, and the service life of the steel wire rope is prolonged.

A gearing assembly (12) for a brake actuator (10), comprising the following features:a drive element (33),a first driven element (36),a second driven element (38), anda gearing output element (40),wherein, with respect to the drive element (33), the first driven element (36) has a different transmission ratio than the second driven element (38),wherein the first driven element (36) can be coupled to the gearing output element (40) by a first clutch (42), which comprises a first drive body (50) and a first driven body (52), andwherein the second driven element (38) can be coupled to the gearing output element (40) by a second clutch (46), which comprises a second drive body (62) and a second driven body (64) and is designed as an overrunning clutch,and a brake actuator (10) comprising a gearing assembly (12).

The invention provides a multi-gear electric drive axle system, a combined structure and a vehicle. The multi-gear electric drive axle system comprises a motor, a differential mechanism, an output shaft, a first intermediate shaft, a second intermediate shaft and a third intermediate shaft. The motor inputs power through the first intermediate shaft, the third intermediate shaft and the second intermediate shaft in sequence, and the third intermediate shaft is hollowly sleeved on the output shaft; a first gear set and a first gear shifting mechanism are arranged on the third intermediate shaft; a second gear set, a second gear shifting mechanism and a third transmission gear are arranged on the second intermediate shaft, and the third transmission gear is meshed with the differential mechanism; gears in the first gear set are kept in a constant meshing state with corresponding gears in the second gear set to form a plurality of transmission gear pairs, and the transmission gear pairs have different transmission ratios; through different combination states of the first gear shifting mechanism, the second gear shifting mechanism and the corresponding gear sets, power transmission of multiple different gears can be achieved.

The invention relates to a cooperative control method for front and rear wheel turning angles of a drive-by-wire four-wheel steering vehicle, which belongs to the technical field of vehicle dynamics control, and comprises the following steps of: S1, designing a variable angle transmission ratio of the drive-by-wire front wheel steering vehicle on the basis of invariable steady-state yaw velocity gain; s2, calculating a target side slip angle and a target yaw velocity of the drive-by-wire front wheel steering vehicle based on a given steering wheel angle input; and S3, generating a front wheel steering angle and a rear wheel steering angle of the drive-by-wire four-wheel steering vehicle by taking the dynamic output of the front wheel steering vehicle as a target based on a multi-objective optimization framework of model predictive control MPC. The control inconsistency of the steering system caused by the change of the vehicle speed is avoided, the steering characteristics of the front wheel steer-by-wire vehicle can be accurately tracked, and the driving burden is effectively reduced.

The disclosure relates to a transmission system for a human powered vehicle, or light electric vehicle, comprising a crank housing, a crank axle, a front sprocket mounted to an output shaft concentric with the crank axle, and a transmission having an input connected to the crank axle and an output connected to the output shaft. The transmission comprises a planetary gear system, configured to be operated according one of a plurality of different selectable transmission ratios, mounted on a lay shaft which is offset and parallel to the crank axle, and an input transmission stage for transmitting torque from the crank axle to an input of the planetary gear system, wherein the input transmission stage has a speed increasing transmission ratio.

The present application relates to the technical field of speed reducer, especially to a hollow composite planetary speed reducer, which comprises a machine shell, an input shaft rotatably connected to the machine shell, a sun gear fixedly connected to the input shaft, an outer gear ring installed in the machine shell, three planetary gears meshing between the outer gear ring and the sun gear, a planetary carrier rotatably connected to the three planetary gears, a worm fixedly connected to the planetary carrier, a rotating shaft rotatably connected to the machine shell, a worm wheel meshing with the worm and fixedly connected to the rotating shaft, and an output shaft rotatably connected to the rotating shaft. The present application combines the planetary speed reducer with the worm and worm gear speed reducer to form a composite speed reducer, which solves the self-locking defect of the planetary speed reducer and the low efficiency problem of the worm and worm gear speed reducer, and realizes secondary speed reduction, thereby increasing the transmission ratio and reducing the overall size of the device, improving the working efficiency and safety of the speed reducer.

The present invention relates to a transmission device for a steering system. The steering system includes a transmission unit with a rotatable first gear element, which may be driven by a drive. The steering system also includes a rotatable second gear element, which is operatively connected to the first gear element for transmitting the drive movement as a function of a transmission ratio between the first and second gear elements. A monitoring unit is further included for monitoring the transmission unit with a detection means for detecting an actuated rotational position of the transmission unit when transmitting the drive movement within a predefined rotational range. The invention also relates to a steering system, a method, and a computer program product.

A motor vehicle comprises at least: a first transmission for transmitting a steering angle of a handlebar to each steered wheel, which wheels are each structurally supported by an element of a second transmission, which is fixed to the frame, enabling a bouncing movement of the suspension. The first movement mechanism is composed of a shear type mechanism with two elements, and one element is integrated with a main shaft of a wheel. The original characteristic is beneficial for managing the suspension sinking effect caused by ground braking force; it is also helpful to manage different dragging distance changes caused by additional displacement of the rotation axis of the wheel (the additional displacement overlaps with the displacement caused by the suspension movement mechanism), and also helpful to manage different transmission ratios between the column rotation angle of the handlebar operated along the axis and the wheel steering angle measured along the steering axis. The steering angle is measured on an element of an integrated main shaft, rather than downstream of a transmission scissor movement mechanism, and the main shaft contains a wheel rotating shaft.

The invention discloses a tractor tilling depth adjusting method and device, and belongs to the technical field of agricultural machinery. The method comprises the steps that the transmission speed ratio is determined according to the wheel rotating speed and the engine rotating speed of the tractor; determining the output power of the engine according to the engine speed; according to the engine rotating speed, the output power, the accessory consumption power and the transmission speed ratio, the maximum traction force capable of being provided by the tractor is determined; the tilling depth of the plough is adjusted according to the pulling force of the plough on the tractor, the maximum traction force and the set tilling depth. According to the embodiment of the invention, the tilling depth can be automatically adjusted according to the load change in the tilling operation process of the tractor, the problem of serious speed reduction of an engine is avoided, the tilling depth adjusting efficiency is improved, and the tilling operation efficiency is improved.

The invention discloses a gear transmission return difference dynamic measurement method and system based on double encoder difference, and belongs to the technical field of precision measurement and transmission control, and the method comprises the steps: respectively installing encoders on an input shaft and an output shaft of a gear transmission chain, and synchronously collecting and obtaining an angle data sequence through nanosecond timestamps; a recursive least square algorithm is adopted to calibrate the transmission ratio in real time; extracting an equivalent return difference angle through phase difference residual step detection at a speed reversing moment; establishing a multiple regression model of the return difference, the rotating speed, the load and the temperature; according to the method, the technical problem that the dynamic return difference characteristic under the variable load and variable speed working condition cannot be accurately represented by a traditional static measurement method is solved, the measurement precision is superior to 1 arc second, and the return difference compensation effect reaches 80% or above.

The invention relates to a vehicle transmission torque control method and system and an engineering vehicle, and the control method comprises the steps: confirming the speed ratio of a gearbox, confirming the gear of the gearbox, limiting the torque of an engine, delaying the judgment time by setting the gear, and if the time of the gearbox at the gear does not exceed the judgment time, starting the engine; if yes, the gear determined according to the speed ratio range and the gear determined at the last moment are smaller and serve as the current gear of the gearbox; the control system comprises a gearbox speed ratio calculation module, a gearbox gear confirmation module, a gear protection module and an engine torque limiting module. The engineering vehicle is provided with the control system. According to the method, gear judgment and engine output torque limiting are carried out on the engineering vehicle provided with the manual box, and the gear judgment method is simple, accurate in gear judgment, low in cost and high in safety.

The invention relates to the field of motor control and adjustment, in particular to a motor rotating speed adjusting method and system for a remote control driving vehicle, and the method comprises the steps: obtaining and preprocessing vertical, transverse and longitudinal vibration signals and running speed data of each wheel of the vehicle; extracting a vibration anomaly feature sequence and an average vehicle speed sequence through a sliding window method, and analyzing correlation to quantify road condition features; quantizing the wheel cooperative stability based on the wheel vibration correlation and the transverse / vertical energy ratio difference degree, and fusing the maximum road condition feature value and the stability mean value to obtain a rotating speed adjustment factor; the actual target rotating speed of the motor is calculated by combining the preset vehicle speed, the transmission ratio and the like, and precise vehicle speed adjustment is achieved through PID closed-loop control. According to the method, the rotating speed adjusting factor is constructed by quantifying the three-dimensional road condition characteristics and the vehicle dynamic stability, real-time adaptive adjustment of the vehicle speed is achieved in combination with PID closed-loop control, and the safety and stability of remote control driving are remarkably improved.

A control device for a human-powered vehicle has an electronic controller that controls a motor that applies a propulsion force to the human-powered vehicle to assist a human driving force. The human-powered vehicle includes a transmission device. The electronic controller is configured to assist in propulsion of the human-powered vehicle with the motor in a state in which the human-powered vehicle is propelled by the human driving force. In a case where a transmission ratio of the transmission device is changed, the electronic controller decreases an assist level of the motor in accordance with the human driving force input to the human-powered vehicle, and controls the motor so that the assist level is greater for a case where the human driving force is a first human driving force than the assist level for a case where the human driving force is less than the first human driving force.

The invention discloses an assembling structure and method for a pure electric steering gear with double speed reducing mechanisms, and relates to the technical field of pure electric steering gear. According to the structure, a speed reducing shell and a motor controller are arranged on a steering gear shell, and a first-stage speed reducing mechanism composed of a small gear and a large gear is sequentially arranged in the speed reducing shell; one end of the worm is connected with the large gear through a transmission balance shaft, and a spring and a bearing are arranged in the transmission balance shaft to achieve radial elastic supporting and mechanical balance. The assembling method is carried out according to the sequence of the self-adaptive adjusting assembly, the worm, the transmission balance shaft, the speed reduction shell, the steering gear shell and the motor controller, and through a rotation test, the meshing clearance of the gear pair and the worm and gear pair is subjected to self-adaptive compensation by utilizing elastic deformation of a spring and a rubber element. Under the condition of a single motor, a large total transmission ratio and a large steering output torque are obtained, and meanwhile transmission stability, noise vibration performance and long-term use reliability are considered.

The utility model discloses a speed increasing mechanism and a speed increasing box. The speed increasing mechanism comprises an input shaft, an output shaft, a duplicate gear, a power input gear and a power output gear. The input shaft and the output shaft are coaxially arranged; the duplicate gear comprises a first gear and a second gear, and the first gear and the second gear are coaxially and fixedly connected; the transmission ratio of the power input gear to the first gear and the transmission ratio of the second gear to the power output gear are smaller than and equal to each other. According to the speed increasing mechanism, two-stage speed increasing transmission is achieved through the arrangement of the duplicate gear, the two-stage speed increasing transmission ratio is consistent through the duplicate gear structure and the setting of parameters of the first gear and the second gear, and coaxial arrangement of the power input shaft and the power output shaft is achieved.

The utility model relates to the technical field of ring main unit running-in test equipment, and discloses a manual-automatic running-in device of a ring main unit switch operating mechanism, which comprises a mechanism main body, a gear transmission group, a driving device, an operating handle, a cam, a fixed shaft and a travel switch which are mutually combined for use to play a role, so that a manual-automatic combined running-in mode is realized. A driving device does not need to be in direct butt joint with the operating mechanism, transition is carried out through the gear transmission set, and when different torques of the operating mechanisms of the ring main units of different models are applied, only the gear transmission ratios of the driving output structure, the manual output structure and the transmission gear structure in the gear transmission set need to be changed, and the ring main units of different models can be adapted. The driving equipment does not need to be frequently replaced, and the manual operation can be performed by adopting a manual output structure in case of power failure or failure of the driving equipment without depending on the driving equipment.

The invention relates to a drivetrain for a hybrid vehicle and a method of executing the same. The transmission system comprises an internal combustion engine power system, a gearbox, a P3 motor and a differential mechanism. The gearbox is in transmission connection with the internal combustion engine power system through an internal combustion engine input shaft. The gearbox comprises a plurality of gear trains with different transmission ratios, and each gear train is connected or disconnected with an output shaft of the internal combustion engine in a one-way transmission mode through a corresponding switchable one-way clutch. Wherein the switchable one-way clutch has a disconnected state and a connected state; in the connected state, the switchable one-way clutch can transmit torque in a one-way mode. The gearbox and the P3 motor are connected to the differential mechanism in parallel through an internal combustion engine output shaft and a motor output shaft respectively. By the adoption of the transmission system, the speed regulation range is wide, the rotating speed of the engine and the rotating speed of the motor are easy to control, the time needed for switching to the target gear is short, and the success rate is high.

The application discloses a kind of drive-by-wire steering control method, device and electronic equipment, it is related to intelligent automobile field.The method comprises: obtaining the steering parameter of vehicle, wherein the steering parameter is the steering transmission ratio between steering wheel and tire;According to the steering parameter of vehicle, the steering signal of steering wheel is converted into the desired steering angle of vehicle;Based on the desired steering angle, the desired wheel speed of each wheel of vehicle is calculated, and the wheel speed control is carried out to each wheel of vehicle according to the desired wheel speed of each wheel.Based on the above method, the desired wheel speed of each wheel of vehicle is realized by calculation desired steering angle, and the wheel speed of each wheel of vehicle is further adjusted according to the desired wheel speed of each wheel of vehicle, so as to realize the drive-by-wire steering based on wheel speed control, to ensure that backup steering system can realize the steering control of vehicle when main steering system fails.

The invention provides a brake clamping force calculation method and device and a storage medium. The method comprises the following steps: controlling a motor to drive calipers to get close to and clamp a brake disc and get away from and release the brake disc; in the clamping stage and the releasing stage, a second torque parameter output by the motor and a rotation angle parameter of the motor are collected respectively, and a corresponding second clamping force parameter is calculated according to the transmission ratio; according to the rotation angle parameter and the second clamping force parameter, coefficients in the initial rigidity curve models corresponding to the clamping stage and the releasing stage are obtained, and updated rigidity curve models corresponding to the clamping stage and the releasing stage are obtained; wherein the initial rigidity curve model is as follows: a, b, c and d are coefficients respectively, f is the clamping force, and x is the rotation angle of the motor; and calculating the clamping force of the brake by using the updated stiffness curve model. According to the method, the accuracy of calculating the clamping force is improved.

The embodiment of the invention discloses a vehicle control method and device, a storage medium, a product and a vehicle, and the method comprises the steps: detecting a communication state or a function state between an upper steering assembly and a lower steering execution assembly of the vehicle; when it is detected that the communication state is interrupted or the function state is invalid, an emergency steering function hard switch and a steering knob device are activated; special communication connection between the emergency steering function hard switch and the steering knob device is established through the emergency steering function MCU; receiving a target steering angle instruction sent by the emergency steering function hard switch and the steering knob device through the special communication connection; based on the target steering angle instruction and a preset up-down rotation transmission ratio, a target execution angle of a vehicle down-rotation execution assembly is obtained through calculation; and the driving current is output to the power-assisted motor through the emergency steering function MCU, so that an execution assembly of the vehicle is driven to rotate to the target execution angle through the power-assisted motor, and the running speed of the vehicle is controlled not to exceed the preset safe vehicle speed.

The utility model relates to the technical field of mechanical equipment, and provides a drive axle and an operation machine. The drive axle comprises an axle housing, two half shafts, a first speed reducer, a second speed reducer and a brake, and the two half shafts are rotationally arranged in the axle housing; the first speed reducer is arranged between the two half shafts in a transmission manner; the second speed reducers are arranged at the ends, away from the first speed reducers, of the half shafts in a one-to-one corresponding transmission mode. Hubs are arranged outside the second speed reducers in a transmission mode. The brake is arranged on the axle housing and connected with the hub, and the brake is used for controlling rotation of the hub. According to the drive axle, the defect that the drive axle in the prior art is generally large in size due to the fact that the transmission ratio of the drive axle is low is overcome, the drive axle with the large transmission ratio is achieved, and operation mechanical efficiency and installation compactness are improved.

The invention discloses a multi-speed steering system, a control method and a wheeled vehicle, the system comprises an input shaft, an output shaft, a four-wheel drive clutch and a multi-speed steering clutch, the four-wheel drive clutch and the multi-speed steering clutch are coaxially arranged on the input shaft, and when the four-wheel drive clutch is in a combined state, power of the input shaft is transmitted to the output shaft at a first transmission ratio; when the multi-speed steering clutch is in the combined state, the power of the input shaft is transmitted to the output shaft at a second transmission ratio, and the second transmission ratio is smaller than the first transmission ratio; the combination state of the four-wheel-drive clutch and the multiple-speed steering clutch is configured to be in one-to-one correspondence with the two-wheel-drive mode, the normal four-wheel-drive mode, the multiple-speed steering mode and the fault four-wheel-drive mode of the system. The transmission efficiency, the reliability and the working condition adaptability can be remarkably improved while the steering flexibility and the traction force are guaranteed.

A double-control fault-tolerant control method, system and device for steer-by-wire and a storage medium relate to the field of automobile steer-by-wire, and specifically comprise the following steps: when a mainboard is detected to have a slight fault, the control right is switched from the mainboard to a slave board, and the mainboard is controlled to be restarted; in the slave plate control stage, a first real-time transmission ratio corresponding to a slave plate is determined based on real-time parameters, and the real-time parameters comprise the real-time vehicle speed and the real-time steering angle rate; after the main board is restarted, the main board receives the real-time parameters sent by the slave board and calculates a second real-time transmission ratio corresponding to the main board; and whether consistency verification of the torque and the transmission ratio is carried out or not is judged based on the real-time parameters, and switching control over the control right is carried out according to a consistency verification result. According to the invention, stable back-switching of the main controller can be ensured.

The invention relates to a sensor arrangement (6) for determining the position of a handlebar (2) of a steering arrangement (1), in particular a steer-by-wire steering arrangement, for a vehicle, comprising: a target device (15) for axially displaceable arrangement on a housing (3) of the handlebar (2), wherein the target device (15) comprises a sensor target (19) and a carrier element (18); a linear displacement sensor (16) for stationary arrangement on the housing (3) of the handlebar (2), wherein the linear displacement sensor (16) is designed to detect a position of the sensor target (19); and a transmission device (17) for arrangement between the target device (15) and the handlebar (2) and for providing a predetermined transmission ratio (i) of an axial travel path (s15) of the target device (15) to an axial travel path (s2) of the handlebar (2). Furthermore, the invention also relates to a steering arrangement (1) with such a sensor arrangement (6).

The invention discloses a variable transmission ratio design method and system for a steer-by-wire system. The method comprises the following steps: establishing a basic model of a basic transmission ratio changing along with vehicle speed and a three-dimensional transmission ratio model for acquiring an actual transmission ratio; and performing iterative optimization by taking the steady-state yaw velocity gain and the center ratio gradient coefficient in the model as optimization targets, and obtaining a three-dimensional transmission ratio model of an actual transmission ratio according to the steady-state yaw velocity gain and the center ratio gradient coefficient obtained by optimization. The basic model with the fixed value steady-state yaw velocity gain is established, and the three-dimensional transmission ratio model is established by combining the transmission ratio increment with the basic transmission ratio output by the basic model, so that the transmission ratio can be smoothly changed along with the vehicle speed and the steering wheel angle, and the operation comfort of the steer-by-wire system is improved. The improved grey wolf optimization algorithm is utilized to carry out iterative optimization on the steady-state yaw velocity gain and the center ratio gradient coefficient, and the optimization efficiency is improved.

The invention discloses a position verification method based on a rear wheel steering system, and the scheme comprises the steps: obtaining the initial values of a dual-position sensor and a dual-motor position sensor when a whole vehicle is powered on, and taking the initial values as a displacement calculation reference; in the running process of the vehicle, the real-time values of the position sensors are subjected to intra-group mutual correction, when the data deviation of the two sensors is within an allowable range, the average value is taken, and otherwise, a single-sensor signal is selected according to validity and is marked to be invalid; and similarly, mutual correction is carried out on motor position sensor data. And then, the position signal and the motor signal after mutual correction are subjected to bidirectional conversion through a transmission ratio to form a rack theoretical displacement and a motor theoretical angle, the rack theoretical displacement and the motor theoretical angle are respectively compared with original signals, the signal validity is judged according to whether the deviation is within a threshold value, and finally, an effective position signal is determined through an arbitration mechanism and output to a motor control system.

A manual transmission (SG) for a vehicle (100) comprising a first shifting element (A), a second shifting element (B), a first planetary gear set (PS1) with a first sun shaft (SO1), a first ring gear shaft (HR1) and a first carrier shaft (ST1), and a second planetary gear set (PS2) with a second sun shaft (SO2), a second ring gear shaft (HR2) and a second carrier shaft (ST2), wherein the first planetary gear set (PS1) and the second planetary gear set (PS2) are radially nested, wherein the first sun shaft (SO1) and the second carrier shaft (ST2) are rotationally fixed, wherein the first ring gear shaft (HR1) and the second sun shaft (SO2) are rotationally fixed to a stationary component, wherein in the closed state of the first shifting element (A) a first gear with a first ratio is engaged, wherein in the first gear the second ring gear shaft (HR2) is configured as the input and the first carrier shaft (ST1) as the output,• wherein, in the closed state of the second switching element (B), a second gear with a second gear ratio is engaged, wherein in the second gear the second ring gear shaft (HR2) is configured as the input and the second web shaft (ST2) as the output.

The application belongs to the field of range hood, and discloses a control method and device of a range hood, computer equipment and a readable storage medium. The method comprises the following steps: acquiring a first motor rotating speed of a motor under the condition that the motor operates according to a reference current; determining a first fan wheel rotating speed of a second fan wheel according to the first motor rotating speed and a transmission ratio of a transmission mechanism stored in advance; inquiring a current corresponding to the first fan wheel rotating speed as a target current in a corresponding relationship between the current required by each flue resistance interval and the oil fume suction capacity of the fan wheel rotating speed interval, and controlling the motor to operate according to the target current. The application can enhance the oil fume suction capacity of the range hood.

[Problem] A transmission structure that may improve a traveling feeling when a drive traveling state is interrupted in traveling and then the drive traveling state is resumed is provided. [Solution] A control device actuates a clutch actuator so that only a clutch mechanism on a most downstream side in a transmission direction in a selected shift gear is brought to a disengaged state when receiving a power cut-off signal in a state in which a traveling state change member is subjected to a forward operation or a reverse operation, and, actuates the clutch actuator so that only the clutch mechanism on the most downstream side in the transmission direction in the selected presumed shift gear is brought to a disengaged state based on a traveling state, and in addition, actuates a gear shift actuator so that a gear ratio of a continuously variable transmission mechanism that realizes a vehicle speed at that time point in the presumed shift gear is obtained while the power cut-off signal is valid, and actuates the clutch actuator so that the clutch mechanism on the most downstream side in the transmission direction in the presumed shift gear at that time point is brought to an engaged state when a cancel signal for canceling the power cut-off signal is input.