66 results about "Shift time" patented technology

The invention provides a direct connection type P1 hybrid commercial vehicle gear shifting coordination control method and device and a vehicle. The method comprises the steps that a vehicle gear shifting request is received, assembly torque reduction is achieved through an engine and a motor, and a gearbox is made to reverse to a neutral gear; the rotating speed of the power assembly is adjusted through an engine and a motor according to the vehicle operation condition and the gear shifting time, so that the rotating speeds of the clutch before and after gear shifting are synchronous; and an assembly torque returning request is received, and the output torque of the engine and the output torque of the motor are dynamically distributed according to the accelerator response characteristic curve. The torque response speed can be increased, rotating speed overshoot and clutch contact impact are avoided, the torque returning speed is increased, and the dynamic property and comfort of a vehicle are improved.

The invention relates to the technical field of vehicles, in particular to a gear shifting control method and device of a vehicle, the vehicle, a medium and a program product.The method comprises the steps that whether the current vehicle meets a preset motor speed regulation condition or not is judged; if the current vehicle meets the preset motor speed regulation condition, the current oil pressure is regulated to the target oil pressure corresponding to the clutch combination point based on a first preset regulation strategy, and the generator speed regulation torque and the rotating speed difference value needing to be synchronized of the current vehicle are obtained; and rotating speed adjustment is conducted according to the generator speed regulation torque and the rotating speed difference value needing to be synchronized, and when rotating speed adjustment is completed and the current vehicle meets the direct drive entering condition, the target oil pressure is adjusted to the locking oil pressure based on a second preset adjustment strategy, so that the gear shifting action is completed. Therefore, the gear shifting time is shortened by entering the gear shifting speed regulation stage in advance, the problem that the dynamic property of the automobile is affected due to the long gear shifting process is solved, and the dynamic property of the automobile is improved when acceleration is needed.

A work vehicle has two transaxles carried by a chassis each having wheel end units rotatable to drive ground-engaging members about wheel axes and having electric machines powering transmission configured to effect multiple gear ratios. The electric transaxles are operationally mechanically uncoupled. One or more sensors detect speed, heading, and loading characteristics of the work vehicle. A controller, having memory and processing architecture, is configured to process control to: receive from the one or more sensors input of the speed, heading, and loading characteristics of the work vehicle. The controller determines a shift pair sequence for shifting the first transmission and the second transmission based on the received input of the speed, heading, and loading characteristics of the work vehicle. The shift pair sequence defines a shift time (tS1) for shifting the first transmission and a shift time (tS2) for shifting the second transmission in which the shift time tS1 is the same or different than the shift time tS2. The controller generates a first shift command to shift the first transmission at the shift time tS1 while the second electric transaxle drives the work vehicle and generate a second shift command to shift the second transmission at the shift time tS2 while the first electric transaxle drives the work vehicle.

The invention provides a gearbox gear control method and device based on dynamic planning. According to the method, the torque and rotating speed requirements of an output shaft of a gearbox are calculated by obtaining front road data and whole vehicle real-time parameters, and the target torque and rotating speed are obtained; the gear shifting cost at the gear shifting moment is calculated, the gear shifting cost comprises oil consumption and impact cost, the gear shifting cost is optimized through a dynamic programming algorithm, and a target gear shifting path and gear time sequence data at multiple moments in the future are determined; and according to the target gear shifting path and the activation state of the gear selection mode, a recommended gear is determined, and a gearbox is controlled to optimize a gear shifting strategy. The reasonable gears are planned in advance, and the problems that in the prior art, planning cannot be conducted in advance according to road changes, consequently, power losses are caused, and the energy consumption of the whole vehicle is high due to the fact that the economical efficiency and gear shifting impact of the whole vehicle are not considered sufficiently are solved.

Disclosed in the present invention are a gear shifting process control method and system for an electric drive transmission of engineering machinery. The method comprises: in response to having received a gear-shifting signal, acquiring a required gear, a current gear, an electric-motor output torque and a slope signal; on the basis of the electric-motor output torque and the slope signal, determining a gear-shifting load type, and on the basis of the required gear and the current gear, determining a gear-shifting requirement type; if the gear-shifting load type is light- and medium-load gear shifting and the gear-shifting requirement type is an upshift requirement, sending an instruction to execute light- and medium-load upshift control; and if the gear-shifting load type is the light- and medium-load gear shifting and the gear-shifting requirement type is a downshift requirement, sending an instruction to execute light- and medium-load downshift control. During light- and medium-load upshift control or light- and medium-load downshift control, rotation speeds on a pre-clutch side and a post-clutch side are rapidly synchronized, thereby reducing the sliding friction work of a clutch and shortening a gear-shifting time.

The present application belongs to the field of shift control, and specifically provides an AMT natural gas commercial vehicle shift torque control method, device, equipment and storage medium, the method comprising: calculating a predicted shift point and calculating a predicted shift time in real time according to the predicted shift point; adjusting the engine torque after reaching the predicted shift time; the predicted shift time is earlier than the actual shift time; after reaching the actual shift time, the target torque required by the current AMT is calculated, and the current engine torque is monitored at the same time; comparing the error between the target torque and the current engine torque, and adjusting the requested torque in real time by using a PID controller. After the torque reduction starts, the AMT target torque and the current natural gas engine torque during the shift process are compared in real time, the current natural gas engine requested torque is adjusted by PID control, the current natural gas engine torque and the AMT required target torque are changed synchronously, and the torque control hysteresis problem during the shift of the matched AMT natural gas commercial vehicle can be avoided.

The embodiment of the present invention relates to the field of motor technology, and discloses a control method and system for the smoothness of motor gear shifting, the method comprising: collecting the initial pedaling torque value and wheel speed, predicting the gear shifting moment according to the initial pedaling torque value and wheel speed; calculating the gear shifting pedaling torque value after the gear shifting according to the predicted gear shifting moment, and fitting a torque smooth change curve related to time according to the initial pedaling torque value and the gear shifting pedaling torque value, and obtaining the target pedaling torque value at the current moment; adjusting the power assist ratio of the motor according to the target pedaling torque value so that the pedaling torque value is equal to the target pedaling torque value; adjusting the power assist ratio of the motor within the first preset time before the predicted gear shifting moment so that the pedaling torque value within the first preset time is equal to the first preset pedaling torque value until the gear shifting is completed. The application of the technical solution of the present invention can solve the problem of obviously feeling the increase or decrease of riding resistance during sudden gear shifting, thereby affecting the riding experience.

The present invention relates to a method for optimizing the parameters of an automatic transmission actuator based on sensitivity analysis and genetic algorithm, belonging to the technical field of construction machinery design. The method establishes a dynamic model of the automatic transmission actuator considering electro-mechanical-hydraulic characteristics, including the dynamic models of gear pumps, proportional solenoid valves and clutches; uses sensitivity analysis method to explore the influence degree of internal and external parameters on the pressure and efficiency of the hydraulic system, and determines the main optimization variables of the hydraulic system; designs a controller to track the pressure of the hydraulic system according to the required oil pressure of each solenoid valve and clutch in the shift control strategy; takes the shift shock degree and the sliding friction work of the friction pair as the optimization objectives, takes the shift time as the constraint condition, and uses genetic algorithm to optimize the main optimization variables of the hydraulic system within the allowable range of parameters, so as to complete the improvement of the shift quality and the forward optimization design of the automatic transmission actuator.

The electric vehicle (10) of the present disclosure is configured to use an electric motor (2) as a power unit for traveling. The electric vehicle (10) includes an accelerator pedal (22), a sequential shifter (26), and a controller (50). The controller (50) is configured to change a motor torque output by the electric motor (2) in response to operation of the accelerator pedal (22) and operation of the sequential shifter (26). The controller (50) is configured to change a change rate of the motor torque at least twice during a preset shift time in response to the operation of the sequential shifter (26).

The invention relates to an electronic speed change method and system for a mountain bike, a terminal and a storage medium, and the method comprises the steps: obtaining real-time riding data which comprises the speed, pedaling frequency, gradient, riding resistance, the output power of a rider and environmental conditions; inputting the real-time riding data into a pre-trained variable speed control model for analysis to obtain a variable speed demand, the variable speed demand comprising a variable speed time point and a gear adjustment strategy; the gear of the transmission is adjusted according to the speed change requirement, so that the riding efficiency and comfort are ensured; when gear shifting of the transmission is completed, current gear data are obtained, the current gear data are matched with the gear numerical value in the gear adjusting strategy, and a matching result is obtained; and if the matching result is that the current gear data is not matched with the gear numerical value, generating an alarm signal, and transmitting the alarm signal to a display end. The method has the effect of improving the riding experience of a rider.

The invention discloses a gear shifting detection method of a DCT transmission assembly, which is characterized in that cyclic gear shifting detection is performed on each gear of the DCT transmission assembly at a standard test starting point, and gear shifting parameters such as input rotating speed and gear shifting time are brought into detection, so that the detection of the DCT transmission assembly is more comprehensive, and the detection result is more reliable. A certain judgment logic is added in gear shifting detection, abnormal conditions occurring in the gear shifting detection process can be processed, detection of faults and gear shifting performance which does not reach the standard obviously can be ended in advance, detection resources can be saved, and detection efficiency can be improved; therefore, the problem that the offline detection reliability of a traditional DCT transmission assembly is poor can be effectively solved, the comprehensiveness of detection can be optimized, and the offline quality of the DCT transmission can be improved.

A work vehicle has two transaxle units supported by a chassis, each featuring rotatable wheel bearing units for driving ground-contacting elements around wheel axles and electric motors for driving the transmission, designed to produce multiple gear ratios. The electrical transaxle units are mechanically decoupled during operation. One or more sensors detect the speed, heading, and load of the work vehicle. A control device with memory and processing architecture is designed to process the control inputs to: receive inputs of the speed, heading, and load characteristics of the work vehicle from one or more work vehicles; and determine a shift sequence for engaging the first and second transmissions based on the received inputs of the speed, heading, and load characteristics of the work vehicle.The shift sequence defines a shift point (tS1) for shifting the first transmission and a shift point (tS2) for shifting the second transmission, where shift point tS1 is equal to or different from shift point tS2. The control device generates a first shift command to shift the first transmission at shift point tS1, while the second electric transaxle unit is powering the work vehicle, and generates a second shift command to shift the second transmission at shift point tS2, while the first electric transaxle unit is powering the work vehicle.

The application provides a gearbox gear control method and device based on dynamic programming. The method obtains front road data and real-time vehicle parameters, calculates torque and speed requirements of the gearbox output shaft, obtains target torque and speed, calculates shift cost at the shift time, including fuel consumption and impact cost, and optimizes the shift cost through a dynamic programming algorithm to determine the target shift path and gear timing data at multiple future times. According to the target shift path and the activation state of the gear selection mode, the recommended gear is determined, and the gearbox optimization shift strategy is controlled. The reasonable gear is planned in advance, the problem that the power loss is caused by the inability to plan in advance according to the road changes in the prior art, and the problems that the economy and shift impact of the vehicle are not considered, resulting in high energy consumption of the vehicle are solved.

Power machine operating procedures (700, 800), which include the following: Direct injection of a gaseous fuel into a power engine in response to a pressure of a gaseous fuel stored in a fuel tank exceeding a threshold pressure; characterized in that the power machine operating method further comprises: Activating a pump for gaseous fuel, adjusting the engagement of the torque converter clutch, and adjusting a gear shift pattern of the transmission in response to the pressure of the gaseous fuel stored in the fuel tank, which is less than or equal to the threshold pressure.

The invention relates to a double-electric-drive-axle double-gearbox gear shifting method and system, and belongs to the field of double-electric-drive-axle control. The method comprises the following steps that during static gear shifting, according to a neutral gear returning instruction, a gearbox controller controls an auxiliary box of a corresponding gearbox to execute neutral gear returning operation, and a main box of the gearbox is kept at the current gear; and when the neutral gear is shifted to the starting gear, according to the starting gear shifting instruction, a gearbox controller controls an auxiliary box of a corresponding gearbox to execute starting gear shifting operation, and a main box of the gearbox is kept at the current gear. During operation, the auxiliary box of the corresponding gearbox executes the neutral gear returning operation, the main box keeps the current gear, then when the starting gear is shifted from the neutral gear, only the auxiliary box executes the starting gear shifting operation, half of the gear shifting time is saved, the gear shifting response speed is higher, and the driver feels better.

A method for synchronizing time between a central server and an automated vehicle (AV) includes exchanging a sequence of time synchronization (TS) messages and generating a set of time offsets between a pair of TS messages among the sequence of TS messages. The method further includes changing a system time of the AV using a time drift estimate defined by a set of time weighting models that are a function of at least one of a plurality of time inputs or the set of shift time offset values, and controlling the AV using the system time and one or more shift instructions providing travel commands from the central server.

A method for torque control of an internal combustion engine of a vehicle according to a transmission hydraulic pressure, comprising: providing an internal combustion engine torque converter connected to the internal combustion engine and an automatic transmission of the vehicle, the internal combustion engine torque converter being configured to distribute the torque of the internal combustion engine to the wheels of the vehicle; confirming (S10), by an internal combustion engine torque control device (10), whether a turbine speed differential satisfies an internal combustion engine torque control entry condition during the shifting of the automatic transmission; calculating (S20), by the internal combustion engine torque control device (10), a required turbine torque to prevent a shift shock using at least one of a turbine angular acceleration, a driving resistance torque, or a clutch magnet torque; performing (S30),by the internal combustion engine torque control device (10), using a turbine torque factor learning, as a stored value of the turbine torque factor learning, a result obtained by applying an accelerator pedal value and / or an internal combustion engine torque and / or a transmission fluid temperature at the beginning of the actual shifting operation, to an entry condition of the turbine torque factor learning under the condition that no breakaway occurs during the shifting operation, applying an average turbine acceleration or an average internal combustion engine torque reference reduction to a condition to prevent the turbine torque factor learning, and generating and storing the result of the turbine torque factor learning according to the shift time that started at the actual shift start point, convert (S40), by the internal combustion engine torque control device (10),of the stored value of the turbine torque factor learning into an internal combustion engine torque control value by the required turbine torque, and applying, by the internal combustion engine torque control device (10), the internal combustion engine torque control value to the output of the internal combustion engine.

The present invention relates to an integrated multi-speed electric drive axle assembly, comprising a reducer assembly, a motor assembly, and an electronic control unit; the reducer assembly is connected to the motor assembly, and the motor assembly is controlled by the electronic control unit; the present invention implements a motor-controlled worm gear mechanism through sequential shifting to achieve simultaneous operation of the main / auxiliary speed change mechanisms, effectively reducing the shifting stroke and shifting time, thereby effectively increasing the shifting time interval and significantly improving the shifting efficiency.

The present invention provides a distributed electric truck torque distribution method, which belongs to the field of new energy commercial vehicle control technology. Specifically, it includes: judging based on the current vehicle speed, accelerator pedal opening and its change rate, if the vehicle speed is less than a threshold value or the accelerator pedal opening and its change rate is greater than a threshold value, adopting a dynamic torque distribution control method to adjust the output torque of the middle shaft and the rear shaft; conversely, adopting an economic torque distribution control method to adjust the output torque of the middle shaft and the rear shaft. Finally, it is judged whether the motor speed of the rear axle integrated shift electric drive bridge is within the set shift point speed range. If the motor speed is not within the set shift point speed range, the original torque distribution control method is maintained. If the motor speed is within the set shift point speed range, the shift torque distribution control method is adopted to ensure that when the motor speed of the integrated shift electric drive bridge reaches the shift speed point, the rear axle output torque is zero or the middle shaft output torque reaches the maximum, thereby shortening the shift time and achieving a shift process without power interruption.

The invention relates to a method for calculating a shift time for a gear change in a transmission or a switchable e-axle of a vehicle, wherein a compensation factor for shifts without interruption of traction is calculated, which reduces the predicted shift time for shifts without interruption of traction so that it represents an equivalent to a shift time of a shift with interruption of traction, wherein a virtual shift time for shifts without interruption of traction is calculated, wherein the calculated shift time is compared with shift times of shifts with interruption of traction and is used for gear selection.

The invention provides a distributed electric truck torque distribution method, and belongs to the technical field of new energy commercial vehicle control. The method specifically comprises the steps that according to the current vehicle speed, the accelerator pedal opening degree and the change rate of the accelerator pedal opening degree, if the vehicle speed is smaller than a threshold value or the accelerator pedal opening degree and the change rate of the accelerator pedal opening degree are larger than the threshold value, a dynamic torque distribution control method is adopted for adjusting output torque of a middle shaft and a rear shaft; otherwise, the output torque of the middle shaft and the output torque of the rear shaft are adjusted through an economical torque distribution control method. And finally, judging whether the motor rotating speed of the rear axle integrated gear-shifting electric drive axle is within the set gear-shifting point rotating speed range or not, if the motor rotating speed is not within the set gear-shifting point rotating speed range, keeping an original torque distribution control method, and if the motor rotating speed is within the set gear-shifting point rotating speed range, adopting a gear-shifting torque distribution control method, it is ensured that when the rotating speed of the motor of the integrated gear-shifting electric drive axle reaches the gear-shifting rotating speed point, the output torque of the rear axle is zero or the output torque of the middle axle reaches the maximum, the gear-shifting time is shortened, and no power interruption exists in the gear-shifting process.

The application relates to a multi-working-mode parallel hybrid power system, wherein a second clutch device (13) is arranged in the motor variable speed module, a third clutch device (14) is arranged between the output end of the engine variable speed module and the output end of the motor input gear pair, and the switching of the second clutch device (13) and the third clutch device (14) can realize the switching of different working modes of the hybrid power system; the motor and the engine can be independently shifted, and power transmission is continuously uninterrupted during the shifting process; the pure electric driving capacity is improved, and the starting torque is increased; the engine and the motor are independently driven in the engine and motor independent driving modes, the driving efficiency is higher under high-speed working conditions; power complementation is realized during the shifting process of the motor and the engine, the shifting time requirement is low, and the shifting reliability is high.

The present invention relates to a vehicle starting gear detection method, device, electronic device and storage medium, belonging to the field of vehicle detection technology, wherein the method comprises acquiring current starting data of the vehicle, and then determining at least one initial starting gear according to the current starting data; then obtaining three features of each initial starting gear according to the current starting data and each initial starting gear; wherein the three features may include the gradient of the shift time of switching to the initial starting gear in the current starting data, the gradient of the previous point of the shift time and the gradient difference; then processing the three features based on a preset model to obtain the current starting gear; obtaining a detection result according to the current starting gear and the current starting data, thereby determining the current starting gear according to the three features of each initial starting gear, thereby detecting the starting gear from multiple aspects, and improving the accuracy of starting gear detection.

The present invention discloses a shift control method and system for an automatic transmission of an automobile. The method comprises: obtaining driving information, wherein the driving data includes driving comfort data, actual driving data, and driver habit information; determining the driver's state based on the driving comfort data; determining whether the shift time needs to be corrected based on the actual driving data, and correcting the target shift time in combination with the driver's state. The present invention corrects the shift time size under consideration of the accelerator pedal opening and its rate of change by integrating operating condition and driver state information, the distance to the preceding vehicle, and the driver's driving state, so as to provide differentiated automatic transmission shift quality, meet the intelligent and variable driver shifting habits, promptly remind the driver and be perceived, and reduce the driver's driving safety risks caused by driving fatigue. The method is low-cost, has strong versatility and portability, and can achieve accurate correction effects through reasonable and simplified judgments.

The present application discloses an AMT shift control method and device. By determining whether there is speed difference adjustment information, it is determined whether the execution result of the previous shift operation meets the condition for adjusting the speed difference in the current shift operation. If there is speed difference adjustment information, the speed difference is adjusted. If the adjusted speed difference still meets the speed difference adjustment condition, the first step is returned to and the next shift operation is entered until the adjusted speed difference is within the preset range, or the shift is successful and there is no abnormal noise, and the shift control process ends. By continuously adjusting the speed difference, the speed difference can be controlled within the preset range, realizing self-adjustment of shift parameters, thereby reducing the number of shift failures. Moreover, since there is no need to exit the current shift process during the AMT shift self-adjustment process and the shift parameters are directly adjusted, the shift time can be shortened, ensuring that when an AMT shift failure occurs, adaptive adjustment can be performed within a short time to achieve a successful shift.

Method for switching control of a hybrid vehicle, comprising: (a) detecting an internal combustion engine torque; (b) determining a drive torque of an engine clutch based on the engine torque; (c) comparing the determined drive torque and a predetermined permissible transmission torque of the internal combustion engine clutch; and (d) increasing an instantaneous shift time of the engine clutch by a predetermined value when the determined drive torque is greater than the allowable transmission torque, and using the increased shift time.

A method for shifting multi-speed transmissions of marine propulsion devices each having a power head and a shift schedule for shifting between first and second gears to transmit torque from the powerhead. The method includes configuring the transmissions of leader and follower marine propulsion devices to shift when shift schedules of the leader and of the follower indicate shift recommendations, respectively. The method further includes receiving a request to shift the transmission of the leader when the shift schedule of the leader indicates the shift recommendation. The method further includes determining whether conditions are met for the follower to follow the leader in shifting. The method further includes automatically requesting, when conditions are determined to be met for the follower to follow the leader, to shift the transmission of the follower so as to be coordinated with shifting the transmission of the leader.

The invention relates to the technical field of gearboxes, in particular to an electric control gear shifting gearbox, a speed change system and a speed change method. The transmission mechanism comprises a gearbox, and a transmission mechanism, an electric push rod mechanism and a control mechanism which are matched with the gearbox, wherein the transmission mechanism comprises a first shaft assembly and a second shaft assembly; the electric push rod mechanism comprises an electric push rod I used for controlling the first gear to be engaged and disengaged and an electric push rod II used for controlling the second gear to be engaged and disengaged and the third gear to be disengaged and disengaged. The control mechanism comprises a controller, and the controller is used for selecting gear shifting control strategies, namely gear shifting time, gear shifting speed, gear shifting in-place and gear taking-off in-place. Through cooperative work of the electric push rod mechanism and the control mechanism, meshing and separation of gears of different gears in the transmission mechanism are achieved, and therefore the gear shifting accuracy is greatly improved; by improving and introducing the fork shaft and the shifting fork, the power transmission path of the gear shifting mechanism is optimized, and gear shifting operation is smoother and more stable.

The invention discloses a planet row structure gearbox gear shifting control method and system and a vehicle, and relates to the technical field of gearbox control, the method is applied to a planet row mechanical automatic gearbox without a synchronizer, and the method comprises the steps that gear and rotating speed information is obtained; calculating an initial target motor rotating speed corresponding to the target gear based on the planet row transmission relation; the initial target rotating speed is corrected according to the rotating speed change relation after gear shifting, upper correction is carried out during gear shifting, and lower correction is carried out during gear shifting; and the motor is controlled to adjust the speed according to the corrected rotating speed, and gear advancing is executed when the real-time rotating speed difference of related parts in the planet row falls into a preset gear advancing synchronization threshold value interval. The system comprises corresponding function modules. For a multi-axle drive vehicle, compensation is also performed based on other axle power disturbances. According to the invention, gear pushing and gear hitting during gear shifting can be effectively avoided, the gear shifting time is shortened, and the gear shifting smoothness and reliability are improved.

A work vehicle has two transaxles carried by a chassis each having wheel end units rotatable to drive ground-engaging members about wheel axes and having electric machines powering transmission configured to effect multiple gear ratios. The electric transaxles are operationally mechanically uncoupled. One or more sensors detect speed, heading, and loading characteristics of the work vehicle. A controller, having memory and processing architecture, is configured to process control to: receive from the one or more sensors input of the speed, heading, and loading characteristics of the work vehicle. The controller determines a shift pair sequence for shifting the first transmission and the second transmission based on the received input of the speed, heading, and loading characteristics of the work vehicle. The shift pair sequence defines a shift time (tS1) for shifting the first transmission and a shift time (tS2) for shifting the second transmission in which the shift time tS1 is the same or different than the shift time tS2. The controller generates a first shift command to shift the first transmission at the shift time tS1 while the second electric transaxle drives the work vehicle and generate a second shift command to shift the second transmission at the shift time tS2 while the first electric transaxle drives the work vehicle.