36results about How to "Avoid shift shock" patented technology

The invention belongs to the field of automobile transmission systems and particularly provides a gear shifting control method and system of a two-gear automatic gearbox. The method and system are used for solving the problem that gear shifting impact exists during gear shifting of a two-gear automatic gearbox in the prior art. For solving the problem, the gear shifting control method provided by the invention comprises the following steps that the driving intention of a driver is identified; a target gear is determined according to the driving intention; and a first clutch and a second clutch are closed or disengaged according to a set mode, and accordingly the current gear of an automobile is shifted to the target gear. Through the gear shifting control method provided by the invention, the sliding friction degree between the first clutch and the second clutch can be controlled in a coordinated mode, that is, when one clutch is closed, the other clutch is slowly disengaged; and the gear shifting process of the two-gear gearbox can be smooth and free of gear shifting impact.

The invention discloses a transmission electric gear selecting and shifting system and a car. The transmission electric gear selecting and shifting system comprises a control module, a drive module and an execution module. The control module is connected with the drive module and the execution module for monitoring the gear shifting force and a gear shifting stroke actually output by the executionmodule and transmitting an instruction for adjusting the gear shifting force to the drive module in real time. The drive module is used for receiving the instruction of the control module, and driving the execution module to perform gear selecting and shifting operations. The execution module includes a gear shifting poking fork, and the gear shifting poking fork moves left and right to push a synchronizer to complete the gear engaging and gear removing actions. The transmission electric gear selecting and shifting system can realize the precise adjustment of the gear shifting force and the gear shifting stroke in real time, ensures that the synchronizer always works in the optimal state, avoids the gear shifting shock problem caused by the excessive gear shifting force, effectively reduces the gear shifting noise, prolongs the life of the synchronizer, and avoids the problem that the gear engaging cannot be performed in time due to too small gear shifting force at the same time.

The invention relates to a hydrostatic drive transmission system, aims to solve the problem that an existing hydrostatic drive system needs to stop during shifting gears, and provides the hydrostaticdrive transmission system, a variable speed control method and a loader. In the hydrostatic drive transmission system, a variable pump is in closed-loop connection with a variable motor, the variablemotor is connected with a gearbox, and a controller outputs control signals used for controlling a pump displacement control solenoid valve, a motor displacement control solenoid valve, a first gear solenoid valve and a second gear solenoid valve correspondingly according to the throttle degree, the gearbox output rotating speed and a direction selection switch signal. The hydrostatic drive transmission system is of single-motor hydrostatic drive, and does not need to stop for shifting gears, during gear shifting, the system has pump displacement compensation control, and gear shifting impactcan be avoided.

The invention discloses a downshift process control method of a three-gear wire control automatic transmission of an electric vehicle. The method uses an electric control unit for judging if a second gear is required to be reduced to a first gear and a third gear is required to be reduced to the second gear through detecting a signal of a D-gear switch, a vehicle speed signal (v) of a vehicle speed sensor and an openness signal (a) of a motor acceleration pedal position sensor, and controls the electrification current of electromagnetic clutches in each downshift process. Taking the reduction from the third gear to the second gear as an example, the electric control unit controls the electrification current of a second-gear electromagnetic clutch according to an electrification current function I2b(t)={I2, t is not smaller than 0 and not greater than T delta; kI2+I2(1-k)(t-T delta)/(T32-T delta), t is greater than T delta and not greater than T32} of the second-gear electromagnetic clutch in a fixed control period T32, and controls the electrification current of a third-gear electromagnetic clutch according to an electrification current function I3b(t)={I3, t is not smaller than 0 and not greater than b T delta; 0, t is greater than b T delta and not greater than T32} of the third-gear electromagnetic clutch, so as to realize the downshift process control of the wire control automatic transmission. The downshift process control method not only can prevent the interruption of input power of the motor in the downshift process, but also can prevent the gear shift impact to realize smooth downshift of the wire control automatic transmission.

The invention belongs to the technical field of a vehicle automatic transmission gearshift, and in particular relates to a gear shifting handle. The gear shifting handle comprises a controller and an operating machine unit, wherein a fixed pulley, a spring tension wheel, and an embeded wheel are arranged at three ends of a gear limiting move spring block in the operating machine unit; the upper end of an operating arm is provided with an operating arm grab handle, an unlock button is arranged on the operating arm grab handle, one side of the lower end of the operating arm is connected with a circle handle block, and a gear limiting block is connected with the circle handle block; the gear limiting block is provided with three grooves, a magnet block is fixed on the gear limiting block, and the gear limiting move spring block is arranged on the lower end of the gear limiting block; the embedded wheel is embedded in the gear limiting block, and the fixed pulley is used for fixing one end of the gear limiting block; and an iron prop is arranged below the gear limiting move spring block, and the lower end of the iron prop is connected with an electromagnet. The gear shifting handle provided by the invention has the advantages of simple mechanism unit structure, reasonable design, and practical function.

The invention discloses a variable-cycle upshift process control method for a multi-gear wire control automatic transmission. The method comprises the following steps: judging whether the first gear is shifted to the second gear, the second gear is shifted to the third gear and the third gear is shifted to the fourth gear by detecting a D-gear switch signal, a vehicle speed signal v of a vehicle speed sensor and an opening signal alpha of an accelerator pedal position sensor by an electrical control unit, and controlling the power-on current of an electromagnetic clutch in each upshift process; taking the process of shifting the second gear to the third gear as an example, by a variable cycle function T(v), controlling the power-on current of a third-gear electromagnetic clutch according to a power-on current function I3b(t) (I3b(t)={I3, t is not less than 0 and not more than T[delta]; kI3+I3(1-k)(t-T[delta])/(T23-T[delta]), t is more than T[delta] and not more than T23}) of the third-gear electromagnetic clutch, and controlling the power-on current of a second-gear electromagnetic clutch according to a power-on current function I2b(t) (I2b(t)={I2, t is not less than 0 and not more than IT[delta]; 0, t is more than IT[delta] and not more than T23}) of the second-gear electromagnetic clutch by the electrical control unit, so that the control on the upshift process of the wire control automatic transmission is finished. According to the method, the interruption of input power of an engine in the upshift process and the impact of shifting can be avoided, and the upshift process of the wire control automatic transmission is stable.

The invention relates to a damping hydraulic clutch planetary gear automatic transmission and a gear shifting method thereof, and belongs to the technical field of transmissions. The damping hydraulicclutch planetary gear automatic transmission specifically comprises an input shaft and an output shaft which are installed in a transmission shell, a plurality of low-speed gear mechanisms, a plurality of high-speed gear mechanisms and a reverse gear mechanism are installed on the input shaft, a plurality of first speed regulating gears which are correspondingly meshed with the low-speed gear mechanisms, the high-speed gear mechanisms and the reverse gear mechanisms are installed on the output shaft, an electronic synchronizer is arranged between the first speed regulating gears and the output shaft. The damping hydraulic clutch planetary gear automatic transmission and the gear shifting method thereof are reasonable in structural design, good in stability and long in service life, and power transmission does not need a friction piece.

The invention discloses acontrol method for the driving torque of a pure electric vehicle. The driving torque is limited according to the gear condition of a vehicle, the driver demand torque, the vehicle speed, the chassis torque intervention function activation condition and the speed limiting function activation condition, generation of large unexpected acceleration when controller software data overflows is avoided, the vehicle driving risk is reduced, and the safety threat to a driver is reduced.

The invention discloses a variable-period downshift process control method of a multi-gear wire-controlled automatic gearbox. According to the method, whether the downshift from the second gear to the first gear, the downshift from the third gear to the second gear or the downshift from the fourth gear to the third gear is needed or not is judged by an electric control unit through detecting a D gear switching signal, a vehicle speed signal v of a vehicle speed sensor and an opening degree signal Alpha of an accelerator pedal position sensor, and the electrification current control of an electromagnetic clutch in each downshift process is carried out. By taking the downshift from the third gear to the second gear as an example, the electrification current of a second gear electromagnetic clutch is controlled by the electric control unit according to a variable control period function T(v) and the electrification current function of the second gear electromagnetic clutch: I<2b>(t) ={I2, t is greater than or equal to 0 but is smaller than or equal to T<delta>; kI2+I2(1-k)(t-T<delta>)/(T<32>-T<delta>), t is greater than or equal to T<delta> but is smaller than or equal to T<32>}, meanwhile, the electrification current of a third gear electromagnetic clutch is controlled according to the electrification current function of the third gear electromagnetic clutch: I<3b>(t)={I3, t is greater than or equal to 0 but is smaller than or equal to IT<delta>; 0, t is greater than or equal to IT<delta> but is smaller than or equal to T<32>}, and the downshift process control of the wire-controlled automatic gearbox is realized. The downshift process control method has the advantages that the input power interrupt of an engine in the downshift process can be avoided, in addition, the gear shifting impact can be avoided, and the stable downshift of the wire-controlled automatic gearbox is realized.

The invention discloses a down-shift process control method of an automatic multi-gear linear control speed changer. The method comprises the steps of judging whether the speed changer needs to be changed from the second level to the first level, from the third level to the second level and from the fourth level to the third level by detecting a D-gear switch signal, a car speed signal (v) of a car speed sensor and an openness signal (a) of an acceleration pedal position sensor by virtue of an electric control unit, and carrying out the electrification current control of an electromagnetic clutch in each down-shift process. Taking the down shift from third level to the second level as an example, the electrification current of a second-level electromagnetic clutch is controlled by virtue of the electric control unit by taking a fixed control period T<32> according to an electrification current function that I<2b>(t) is equal to {I<1> t is less than or equal to T<theta> and more than or equal to zero; kI<1>+I<1>(1-k)(t-T<theta>)/(T<21>-T<theta>), t is more than T<theta and less than or equal to T<21>}, simultaneously the electrification current of a third-level electromagnetic clutch is controlled according to the third-level electromagnetic clutch electrification current function that I<3b>(t) is equal to {I<3>0 t is more than or equal to 0 and less than or equal to beta T<theta>; 0, t is more than beta T<theta> and less than or equal to T<32>}, so that the down-shift process control of the automatic linear control speed changer is realized; by adopting the down-shift process control method, not only can the interruption of the input power of an engine in the down-shift process be avoided, but also the gear shift impact can be avoided, and the stable down-shift of the automatic linear control speed changer can be realized.

The invention relates to a vehicle clutch control system or part, in particular to a clutch petal assembly. A clutch petal upper switch, a clutch petal lower switch and a clutch petal self-limiting mechanism are arranged on a clutch support body, a crushing nut is connected to an upper support in a riveted mode, and a return spring is further arranged on a shaft sleeve between the upper support and a lower support. When a clutch is stepped, the upper switch is connected, an engine control unit receives a signal of the upper switch, the ignition advance angle is decreased, the oil spraying amount is decreased, power storage is carried out, the gear shifting impact is avoided, the service life of a clutch system is prolonged, and oil consumption is reduced. When a clutch pedal is stepped tothe bottom, the clutch system is disconnected, the clutch petal lower switch is connected, a clutch system disconnection signal is provided for a keyless entry system, and safe starting of an automobile is ensured. Through the crushing nut, the situations that when the automobile is collided, a clutch main cylinder moves backwards and is disengaged from the upper support, the clutch petal rotatesaround the mounting point of the crushing nut and an instrument cross beam support, and consequently a left shank is hurt can be prevented.

The invention discloses an electric motorcycle as well as a power assembly and a control method thereof, wherein the power assembly comprises a motor, a gearbox and a clutch; the gearbox is provided with a plurality of gears, and the clutch can be connected with a rotating shaft of the motor and an input shaft of the gearbox. The power assembly further comprises the gearbox that is provided with aplurality of gears so as to provide different speed ratios; according to the technical scheme, different speed ratios can be provided; the motor can be kept in an efficient working state in a large vehicle speed interval through gear shifting; the motor can be prevented from working in a limit rotating speed state for a long time to a large extent, the large-current discharging time of a power battery pack can be shortened, and the cruising ability and the service life of the power battery pack can be guaranteed.