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.

In a powertrain for motor vehicle that includes an engine, a first electric machine and a second electric machine, each machine being able to function alternately as a motor and a generator, a transmission having an input driveably connected to the engine and the first electric machine and a transmission output driveably connected to the second electric machine and wheels of the vehicle, a method for controlling the powertrain includes using the engine to produce wheel torque, performing a gear shift using the transmission, if a reduction in powertrain output torque is to occur while modulating torque during the gear shift, operating one of the first electric machine and the second machine as an electric generator to reduce the powertrain output torque, and if an increase in powertrain output torque is to occur while modulating torque during the gear shift, operating one of the first electric machine and the second machine as an electric motor to increase the powertrain output torque.

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.

The invention belongs to an automotive transmission and in particular discloses a double-clutch automatic transmission shift control method. The method is characterized in that: a duty ratio of a solenoid valve for controlling the engagement and separation of clutches in a double-clutch automatic transmission is adjusted to control a matched timing sequence of two clutches and respective joint speed and joint pressure thereof in the shifting process, so that the sum of transmission torque of a front clutch and a subsequent clutch adapts to the torque of an engine in the shifting process; and a shifting moment and a corresponding shift method are determined according to an accelerator pedal position signal acquired by a sensor, the rotating speed of the engine, the rotating speed and a clutch pressure signal of an input shaft of the front clutch and the rotating speed and a clutch pressure signal of an input shaft of the subsequent clutch. By the method, the shifting process is stable and rapid, the shifting quality is high, and the riding comfort is improved.

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 provides a power assembly for an electric automobile. The power assembly comprises a driving motor (2) and a power transmission system (1), wherein the driving motor is a permanent magnet synchronous motor; the power transmission system (1) comprises a gear transmission system, an automatic gear-shifting system and an automatic parking system; the gear transmission system comprises a differential assembly (13), an input shaft (16), a shifting fork, a synchronizer (17), a first-gear gear and a second-gear gear (18); the automatic gear-shifting system comprises a gear-shifting motor (4), a shifting fork (5), a shifting fork shaft (7), a gear-shifting shaft (6), a gear-shifting cover plate (8), a gear-shifting shaft angle sensor (9), a gear-shifting position detection rod (10),a gear-shifting motor cover plate (11) and a shift sensor (12); and the automatic parking system comprises a P-gear motor (3), a P-gear pawl (15), a P-gear pawl pressure plate (19), a spring pre-fastening mechanism (20), a P-gear shaft (21), a P-gear cover plate (22), a P-gear position detection rod (23) and a P-gear position sensor (24).

The invention discloses a gear-shifting control method for an automatic hydraulic speed changer. The gear-shifting control method comprises the steps that in the one-time gear shifting process, only one clutch is started, the other clutch is combined, the torque exchanging process is carried out between the two movement clutches, oil pressure is controlled through the combination of the clutch controlling step and the separated clutch controlling step, and the flexible clutch combination is guaranteed by adjusting the K1 and K2 control pressure in the gear shifting process. The engine torque changing is controlled, and easy, efficient and smooth gear shifting controlling of the automatic hydraulic speed changer is achieved. The test carried out under the full accelerator aperture and other limiting conditions such as gear lifting and gear jumping and reducing in a low-gear gear area shows that the control method can meet the requirements for gear shifting quality of forward torque gear lifting, forward torque gear reducing, negative torque gear lifting and negative toque gear reducing.

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.

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 shifting method and a shifting system of a hybrid electric vehicle. The hybrid electric vehicle comprises an engine, a clutch, a synchronizer, an electric generator and a drive motor. The engine, the electric generator, the clutch and the drive motor are connected in series in turn; the clutch is connected to the electric generator and the drive motor. The shifting method comprises the steps of receiving a shifting instruction and quickly reducing torque of the engine through negative torque provided by the electric generator, and determining a target gear according to the shifting instruction; separating the clutch to perform shifting operation when the input torque of the clutch is less than the safety torque of the clutch. According to the shifting method disclosed by the embodiment of the invention, the clutch is separated to perform shifting operation when the input torque of the clutch is less than the safety torque of the clutch, thus the shifting time is reduced, the efficiency of power transmission is improved, emissions are reduced, and the service life of the clutch is prolonged.

The invention relates to a power transmission device of mixed power vehicle which uses engine and electromotor as power sources, wherein it is formed by an engine, an electromotor, a generator, a clutch connected to the automatic control system, a DCT gear box, and an accumulator; said clutch comprises three clutch couples independent controlled inside one frame; the active blades of clutch couples are fixed on the inner chamber of frame; the driven blade of first clutch couple is driven connected to the input axle of gear box; the driven blade of second clutch couple is driven connected to the another input axle of gear box; the driven blade of third clutch couple is driven connected to the output axle of engine; the frame of clutch via the central axle fixed on one side of frame is driven connected to the rotor axle of electromotor. The invention has high transmission efficiency, high torque capacity, lower cost, and reduced energy consumption.

A method for adjusting the point of engagement of a friction clutch of a step-variable transmission for a motor vehicle, in particular a friction clutch of a dual clutch transmission. The friction clutch is controllably actuated by means of a clutch actuator and at least one synchronizer shifting clutch is controllably actuated by means of a shift actuator for the engagement and disengagement of a gear ratio of the spur-gear transmission. A set-point of the clutch actuator for the point of engagement of the friction clutch is adjusted as a function of a speed gradient value, which ensues from a transitional state with the friction clutch actuated and the shifting clutch actuated, once the shifting clutch is opened. The transitional state is established by setting the clutch actuator and the shift actuator to a respective transitional value substantially at the same time or, at least in sections, in parallel.

A method for setting the engagement point of a friction clutch of a multi-step transmission for a motor vehicle. The friction clutch can be activated, controlled, by means of a clutch actuator. A set point value of the clutch actuator is set for the engagement point of the friction clutch as a function of a time profile of a physical variable which occurs starting from a transition state after activation of the friction clutch to a transition value. An electric machine is connected to the multi-step transmission. Influencing of the multi-step transmission by the electric machine is taken into account in the setting of the engagement point of the friction clutch.

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 an on-slope shift control method for an automatic gearbox of a heavy-duty vehicle. The method comprises shift control under a climbing working condition, specifically, a gearbox control unit TCU firstly determines the slope-mass grade percentage according to a calculated vehicle mass and a slope value, then determines a corresponding climbing grade mode according to the slope mass grade percentage, and then checks a pre-calibrated accelerator opening degree-target gear table under a climbing grade mode to obtain a target gear, and finally a gearbox executing mechanismexecutes gear shifting operation according to the calculated target gear and a gear shifting instruction, wherein climbing grade modes comprises a low-level mode, a middle-level mode and a high-levelmode. With the influence of the vehicle driving state, slopes and the mass on gear shifting considered comprehensively, the design adopts a regular logic control strategy, not only improves the economy of the vehicle, but also improves the power, drivability and system stability of the vehicle.

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 electro-hydraulic automatic shift transmission case control device and method in engineering machinery. The device comprises an engine speed sensor, a torque converter turbine speed sensor, an engine throttle opening sensor, a vehicle speed sensor, a vehicle master controller, an engine throttle execution mechanism, an automatic shift transmission case and an electronic controller. The engine speed sensor, the torque converter turbine speed sensor, the engine throttle opening sensor and the vehicle speed sensor input signals to the electronic controller. The electronic controller is communicated with the vehicle master controller. The vehicle master controller inputs control signals to the engine throttle execution mechanism. The electronic controller inputs the control signals to the automatic shift transmission case. The invention uses different shift modes according to the intention of a driver, realizes the transmission shift of hydraulic engineering machinery in proper time, and ensures the economical efficiency, power efficiency and practicability of the vehicle. During the shifting process, the invention can ensure good gear shifting performance by controlling the engine and improve the comfort of passengers.

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.

Opaque glitter particles that are uniform in size and shape are disclosed that have an optically variable color with a change in angle of incident light. The glitter particles have an organic substrate and an optical interference structure on one or both sides of the organic substrate. The optical interference design can be a Fabry-Perot structure or can be an optically variable ink.

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.

The invention discloses a gear-shifting control method and system with driving style identification for an automatic gearbox. The gear-shifting control method comprises the steps that 1 a driving parameter under a current automobile running condition is collected ; 2 lowpass filtering treatment is conducted on the driving parameter under the current automobile running condition; 3 a dynamic-property evaluation parameter SP is calculated under the current automobile running condition; 4 an automobile comprehensive dynamic-property evaluation parameter SPi is compared with a dynamic-property evaluation parameter SPi-1 obtained by the last time to confirm whether the automobile changes a gear-shifting point or not; 5 a new gear-shifting point is calculated to conduct gear shifting according to the dynamic-property evaluation parameter SPi under the current running condition. The gear-shifting control method and system with the driving style identification for the automatic gearbox have the advantages that the automatic gearbox gear can be adjusted automatically to conduct gear shifting based on the road condition and according to the driving style, the gear-shifting timing is more reasonable, the number of gear shifting is reduced, the fuel economy and working efficiency of the automobile are improved, and the quality of gear shifting is improved.

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.

In a powertrain for motor vehicle that includes an engine, an electric machine, a transmission having an input driveably connected to the engine and a transmission output driveably connected to the electric machine, and a powertrain output driveably connected to the electric machine and wheels of the vehicle, a method for controlling torque during a shift includes transmitting engine torque through the transmission to the powertrain output; during a shift, operating the electric machine to modify the torque transmitted to the powertrain output; and storing energy generated by the electric machine during the shift.

The invention relates to a method for controlling gear shift without power interruption of a hybrid car, which is characterized by comprising the following concrete control steps of a gear shift process, a transition process from pure motor driving to engine driving, a transition process from the engine driving to the pure motor driving; and an BSG motor is connected with a crank pulley of a motor, and a driven main motor is connected with an output shaft of a transmission. By means of a fast response characteristic of a motor system, output torque of the whole power transmission system is adjusted and compensated during the gear shift so as to realize the gear shift process without power interruption. In the method of the invention, the defect of power interruption during the gear shift of the traditional AMT system can be made up preferably, dynamic property of the whole car is improved, and smoothness of the whole car is enhanced.