257results about How to "Improve shift quality" patented technology

A multiple speed transmission capable of producing five underdrive gear ratios, one direct drive ratio, four overdrive ratios, and four reverse ratios includes four interconnected planetary gearsets, multi-plate clutches and brakes controlling the gearset elements, and a coupler that changes between forward drive and reverse drive by holding and releasing alternate gearset components against rotation on the transmission case. The transmission in combination with a single-speed transfer case having either an on-demand transfer clutch, or a full-time all-wheel drive system, are formed in an integrated package.

The invention discloses a three-clutch transmission device for an electric vehicle. The three-clutch transmission device is characterized by comprising an input shaft (1), a K1 clutch (2), a K2 clutch (3), a K3 clutch (4), a first-gear gear (5), a second-gear gear (6), a third-gear gear (7), an output shaft (10), a conduction device (11) and a gear controller, wherein the K1 clutch (2), the K2 clutch (3) and the K3 clutch (4) are respectively connected with the first-gear gear (5), the second-gear gear (6) and the third-gear gear (7); the gear controller automatically controls the output shaft (1) to be switched into different shifts through different clutches; and the output shaft (10) is connected with a gear-shifting gear through the conduction device (11). The three-clutch transmission device for the electric vehicle can be used for the electric vehicle and has the advantages of power gear shifting, short gear shifting time, good gear shifting quality, simple structure, low cost and the like.

The invention provides a method for controlling repeated gear engagement in a DCT (dual clutch transmission) synchronizer gear engaging process. By the method, the problems that in a DCT gear shifting process, gear shifting cannot be realized or impact of gear shifting is caused under conditions that teeth face to each other, gear shifting fails and a synchronizer is worn are solved. In the method, a whole gear shifting process is divided into three stages comprising (1) a stage of approaching a synchronizing ring, (2) a synchronizing stage, and (3) a gear engaging stage after a gear sleeve is connected with connecting teeth. After the three stages are analyzed, the conditions that the teeth face to each other comprise the following two types of conditions: (1) teeth of the gear sleeve face teeth of the synchronizing ring; and (2) the teeth of the gear sleeve face the connecting teeth. The two types of conditions are analyzed, flexible gear engaging is realized and the synchronous ring is protected from being impacted by repeatedly engaging a gear, so that the service life of the synchronizing ring is prolonged, and the gear engaging success rate is increased.

A system for actuating a clutch that alternately driveably connects and disconnects components, includes a clutch having a piston that includes a first apply area and a second apply area, a fluid pressure source, a source of variable control pressure, and a control coupled with the fluid pressure source and operative in response to the control pressure to engage the clutch initially by increasing pressure steadily at the first apply area up to a first magnitude followed by a rapid increase in pressure at the first apply area and the second apply area above the first magnitude to a second magnitude.

The invention provides a continuously variable transmission system achieving multi-mode switching of hybrid power. The continuously variable transmission system comprises an input component, an outputcomponent, a clutch assembly, a brake, a hydraulic transmission assembly and a planetary gear assembly. The input component is connected with the hydraulic transmission assembly. The output componentis connected with the planetary gear assembly. The clutch assembly connects the input component and the hydraulic transmission assembly to the planetary gear assembly. The brake and the clutch assembly provides the transmission ratio of continuous advancing or retreating between the input component and the output component. Through linear increase or non-linear increase of the displacement ratioof the hydraulic transmission assembly, hydraulic-mechanical transmission is converted into mechanical transmission. Integrated control can be carried out through a dual power source adopting an engine and an electromotor as power and the transmission and composite transmission adopting hydraulic transmission, mechanical transmission and hydraulic-mechanical transmission as the transmission manner, the statistical method based on test data is used, and matched energy management strategies are provided.

The invention discloses an automatic gear shift control system and method of a motor-transmission integrated drive system for an electrical vehicle. The motor-transmission integrated drive system comprises a drive motor, a transmission, a motor controller and a gear shift execution mechanism, wherein the drive motor is directly connected with the transmission through a spline and controlled by the motor controller to output a torque to the transmission; the gear shift execution mechanism is used for finishing the gear shift operation of the transmission; the motor-transmission integrated drive system is characterized in that a vehicle controller is arranged for coordination control on the motor controller and the gear shift execution mechanism to realize automatic gear shift function of the motor-transmission integrated drive system; the vehicle controller and the motor-transmission integrated drive system form the automatic gear shift control system. According to the automatic gear shift control system, the automatic gear shift function of the motor-transmission integrated drive system can be realized and the gear shift quality of the motor-transmission integrated drive system can be improved.

The invention relates to a non-clutch AMT (Automatic Manual Transmission) control system. The non-clutch AMT control system comprises an MCU (Microprogrammed Control Unit) and a TCU (Transmission Control Unit) which are interconnected. Compared with the prior art, the non-clutch AMT control system has the beneficial effects that after the system enters a shifting process, the TCU can take over the control right of a driving motor, so that the technical effects of optimizing the shifting quality, reducing the shifting time and improving the shifting stability can be achieved. The invention also relates to a non-clutch AMT control method. The non-clutch AMT control method comprises a speed regulating stage; the motor in the shifting process of the method is in a torque mode; the speed regulating stage comprises a motor synchronous speed regulating stage and a mechanical synchronous speed regulating stage. Compared with the prior art, the non-clutch AMT control method has the beneficial effects that the shifting process is divided into six stages through the control method, namely, an unloading stage, an idling stage, an electronic synchronizing stage, a mechanical synchronizing stage, a gear engaging stage and a loading stage, and thus the technical effects of greatly reducing the overall shifting time, reducing the impact in gear engaging, and prolonging the service lives of mechanical parts such as a synchronizer can be achieved.

The invention relates to an automatic control method for a synchronizer. According to the method, gear shifting instructions are determined according to gear shifting signals acquired by a gearbox control unit. The whole synchronizer moving process is completed through six control stages of synchronizer gear releasing, combining of synchronizer with front idle travel, synchronizer sliding abrasion combining, combining of synchronizer with real idle travel, synchronizer compression and synchronizer on gear according to synchronizer speed and time of all control stages. By the aid of the method, the moving control stages of the synchronizer are subdivided, and accordingly, the power failure time during gear shifting is optimized effectively, the synchronizer noise is reduced, the synchronizer hardware abrasion is reduced, and the gear shifting quality is improved.

The invention provides a gear shifting control method and system of an automatic transmission and a vehicle. The method comprises the steps that in the gear shifting process, a gear shifting fork is controlled to move at a target speed; the rotation speed of a synchronizer is adjusted, so that when the speed difference between the rotation speed of the synchronizer and the rotation speed of an engaging tooth reaches the target speed difference, the synchronizer and the engaging tooth are controlled to be synchronous until the rotation speed of the synchronizer and the rotation speed of the engaging tooth are equal, and synchronization of the synchronizer and the engaging tooth is completed; the gear shifting fork is controlled to move at the target speed; and when the rotation speed of the synchronizer and the rotation speed of the engaging tooth are not equal, the synchronizer and the engaging tooth are controlled to be engaged with each other to achieve gear shifting. The method has the advantages of being smooth in gear shifting process and improving the gear shifting quality.

Disclosed are a vehicle power assembly control method and a vehicle power assembly control system. The vehicle power assembly control method includes steps: acquiring a current accelerator opening degree, current vehicle speed, a current gear ratio, a transmission and rotation inertia factor and a current gear position of a vehicle; confirming driving power according to the current accelerator opening degree and the current vehicle speed; confirming driving torque according to the current vehicle speed, the current gear ratio, the transmission and rotation inertia factor, the current accelerator opening degree, the current gear position and the driving power; confirming TCU (terminal control unit) request torque according to the driving power and the driving torque; performing vehicle power control according to the driving torque, and controlling a gearbox according to the TCU request torque. The vehicle power assembly control method confirms the torque of the vehicle based on the driving power, and thereby solves the problem that vehicle power is discontinuous, caused by step gear shifting before and after shifting gears, and improves shift quality of the vehicle.

A method for learning a characteristic of a clutch in a DCT vehicle includes a shifting condition determination step for determining whether a shifting condition is satisfied, a synchronization step for partly reducing torque of a disengagement-side clutch in order to synchronize an engine speed with a speed of an engagement-side input shaft when shifting is started when the shifting condition is satisfied, a clutch release determination step for determining whether a slip amount of a disengagement-side clutch exceeds a reference slip amount, and a disengagement-side clutch learning step for updating clutch torque on a characteristic curve of the disengagement-side clutch using the torque of the disengagement-side clutch that is controlled to allow the slip amount of the disengagement-side clutch to exceed the reference slip amount in the clutch release determination step, and for learning the updated clutch torque.

A method for shifting a transmission from a current gear to a target gear following release of an accelerator pedal, the transmission having first and second clutches for alternately connecting and disconnecting a power source and first and second input shafts, respectively, first couplers for alternately connecting and disconnecting a transmission output and a first set of gears driveably connected to the first clutch, and second couplers for alternately connecting and disconnecting the output and a second set of gears driveably connected to the second clutch. The steps include disengaging the first and second clutches, using a first coupler to maintain a drive connection between the output and the current gear, determining a target gear, using the target gear to determine a preselected gear, actuating a coupler to produce a drive connection between the output and the preselected gear, and engaging one of the first and second clutches such that said clutch driveably connects the power source to the output through said coupler and preselected gear.

The invention provides a pure electric two-gear AMT gear shifting control method based on synchronous track optimization. A gear shifting motor and drive motor parallel coordinated control strategy isprovided, the synchronizer work process is decomposed in details, and the optimal synchronous track is determined through the PI control method and the optimal control method based on the minimum principle; and the good gear shifting quality is guaranteed, and the gear shifting smoothness and rapidness are improved.