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

A touch point adjusting method for a double clutch transmission, may include determining amounts of individual adjustment of first and second pressure plates and a center plate depending on temperature, determining an amount of final adjustment of a touch point in consideration of the amounts of the individual adjustment determined at the process of determining the amounts of the individual adjustment, and adjusting the touch point of a corresponding clutch based on the amount of the final adjustment of the touch point determined at the process of determining the amount of the final adjustment of the touch point.

The invention discloses a method for determining the semi-coupling point of a wet dual-clutch transmission. The method for determining the semi-coupling point of the wet dual-clutch transmission comprises the following steps: detecting the oil temperature of the transmission when the wet dual-clutch transmission shifts gears, and when the oil temperature is within the normal range When the oil temperature is low, gradually increase the input pressure of the shift-in clutch, and at the same time judge the pressure of the half-joint point of the clutch according to the change trend of the speed difference between the input shaft and the output shaft of the transmission; when the oil temperature of the transmission is at a low temperature, gradually increase the input pressure of the shift-in clutch , at the same time judge the pressure of the clutch half-engagement point by the speed difference between the transmission input shaft and the output shaft and the change trend of the output shaft torque. It can quickly and efficiently control the pressure of the clutch half-joint point under different oil temperature conditions, effectively avoiding the phenomenon of shifting shock and power cycle.

The invention discloses a method for controlling the variable-period downshifting process of a multi-gear-by-wire automatic transmission. In the method, the electronic control unit detects the switch signal of the D gear, the vehicle speed signal v of the vehicle speed sensor, and the opening degree signal α of the accelerator pedal position sensor. Determine whether it is necessary to downgrade from the second gear to the first gear, from the third gear to the second gear, from the fourth gear to the third gear, and carry out the current control of the electromagnetic clutch in each downshift process. The downshifting process control method can not only avoid the interruption of the input power of the engine during the downshifting process, but also avoid the shock of shifting, and realize the smooth downshifting of the wire-controlled automatic transmission.

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 discloses a upshift 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 first gear is required to be risen to a second gear and the second gear is required to be risen to a third 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 upshift process. Taking the rising from the second gear to the third gear as an example, the electric control unit 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 T delta; kI3+I3(1-k)(t- T delta) / (T23-T delta), t is greater than T delta and not greater than T23} of the third-gear electromagnetic clutch in a fixed control period T23, and 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 b T delta; 0, t is greater than b T delta and not greater than T23} of the second-gear electromagnetic clutch, so as to realize the upshift process control of the wire control automatic transmission. The upshift process control method not only can prevent the interruption of input power of the motor in the upshift process, but also can prevent the gear shift impact to realize smooth upshift of the wire control automatic transmission.

The invention provides a gear shifting control method and system of an automatic gearbox and a vehicle. The method comprises the steps that when up-shift of the automatic gearbox is controlled through initial gear shifting control pressure, the actual time T1 from the up-shift starting time to the time when the rotating speed of a turbine is reduced by the preset rotating speed is detected; the T1 is compared with the standard time T2 from the up-shift starting time of the automatic gearbox to the time when the rotating speed of the turbine is reduced by the preset rotating speed; if the difference value of the T1 and the T2 exceeds an error allowance range, the initial gear shifting control force is adjusted according to the difference value of the T1 and the T2, wherein the larger the difference value, the larger the adjusted gear shifting control pressure is. By means of the gear shifting control method of the automatic gearbox, the gear shifting impact can be lowered or avoided, gear shifting can be smoother, the abruptness occurring in the gear shift process can be reduced and even eliminated, and the riding comfort is improved.

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 present invention relates to a gear position control method, device and medium. The method includes: judging whether a first parking gear switching control instruction for switching the gear of an automatic transmission to a parking gear is received; When the gear switching control command is used, the gear position of the automatic transmission is controlled to be switched to neutral gear; it is judged whether the ratio of the input shaft speed of the automatic transmission of the current vehicle to the engine speed of the engine of the current vehicle is greater than a preset value; when the ratio When it is greater than the preset value, the gear position of the automatic transmission is controlled to be switched from neutral gear to parking gear. The implementation of the present invention can avoid the shifting impact caused by the forward gear or the reverse gear being shifted into the parking gear for some 6AT+electronic shifter models, and then the parking gear is shifted out.

A method for operating a drive train of a hybrid vehicle having a hybrid drive comprising at least one electric machine (2) and an internal combustion engine (1), wherein an indirect connection between the internal combustion engine (1) and an output device (4) There is an automatic shift transmission (3), wherein the electric motor (2) is coupled to the shaft of the automatic shift transmission (3) via a friction clutch (5), and wherein, in the automatic shift transmission (3), the interruption is made by mixing With the drive torque available at the output, the drive implements a shift in such a way that the drive torque available at the output (4) is first reduced in a first phase and then carried out in a second phase The actual gear change, and then in the third phase, the drive torque is built up again at the output (4), wherein, to carry out the actual gear change, after disengaging the actual gear and before engaging the target gear , the gearshift transmission (3) is synchronized in such a way that the rotational inertial mass of the electric motor is fully utilized, that is, when the friction clutch (5) is opened, the rotational speed of the electric motor (2) is brought to the inertial rotational speed, and subsequently For the rotational inertia synchronization of the gearshift transmission, the friction clutch (5) is first engaged and then at least partially opened again.

A series-parallel hybrid transmission, including a transmission device, a wiring harness, a shock absorber, an internal combustion engine, and a controller. The transmission device includes a battery and a battery management system, and the battery is connected to the first inverter and the second inverter , the first inverter is connected to the first motor, the output end of the first motor is provided with a first gear, the first gear is connected to the second input shaft through the first idler gear, the second inverter is connected to the second motor, The output end of the second motor is provided with a second gear, and the second gear is connected with the first input shaft through the second idler gear. The first input shaft is provided with a first synchronizer and a fourth-speed main gear. The clutch is connected to the second input shaft, and the second input shaft is connected to the internal combustion engine through the shock absorber. By adopting the above-mentioned structure, the fuel consumption can be reduced as much as possible, the impact of gear shifting can be reduced, and the power performance can be improved.

The invention discloses a method for controlling the variable-period upshifting process of a multi-gear-by-wire automatic transmission. In the method, the electronic control unit detects the switch signal of the D gear, the vehicle speed signal v of the vehicle speed sensor, and the opening degree signal α of the accelerator pedal position sensor. Determine whether it is necessary to upgrade from the first gear to the second gear, from the second gear to the third gear, and from the third gear to the fourth gear, and carry out the current control of the electromagnetic clutch in each gear up process. Taking the second gear to the third gear as an example, the electronic control unit controls the cycle function T(v) variablely, and at the same time presses the third gear electromagnetic clutch current function I3b(t)={I3,0≤t≤Tδ;kI3+ I3(1‑k)(t‑Tδ) / (T23‑Tδ),Tδ