32results about How to "Improve shift feel" patented technology

A closed loop shift control apparatus and method based on estimated torque in friction elements controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The estimated torque is preferably calculated by using estimated torque signals generated as a function of speed measurements represented either the engine speed and turbine output speed or transmission output speed and wheel speed under dynamically changing conditions.

The invention provides a control method for an electromagnetic valve of an automatic transmission and relates to the technical field of control over the automatic transmission. The control method aims at solving the problem that an existing electromagnetic valve of an automatic transmission is low in response speed. The control method for the electromagnetic valve of the automatic transmission includes the steps that firstly, a current I keeping the electromagnetic valve in a dead zone critical point is found according to the current and plunger position characteristics of the electromagnetic valve; secondly, when the electromagnetic valve does not work, a current I1 is kept for the electromagnetic valve, the current I1 is larger than the current I and smaller than a clutch kisspoint current, the electromagnetic valve has a tiny opening degree, and it is guaranteed that tiny oil pressure exists between the electromagnetic valve and a corresponding clutch; and thirdly, when the electromagnetic valve prepares to start to work, a working current I2 is continuously supplied to the electromagnetic valve, the current I2 is quickly increased on the basis of the current I1, and it is guaranteed that the oil pressure of the clutch corresponding to the electromagnetic valve is gradually increased. The control method has the beneficial effects that the working response speed of the electromagnetic valve is high, and the oil pressure of the clutch is more stably established, gear shifting control over the automatic transmission is facilitated, and the gear shifting feeling of a vehicle is improved.

The present invention relates to a manual valve of an automatic transmission, having a groove formed at an exterior surface thereof so as to reduce shock and to improve shift feel by allowing oil to flow through the groove when releasing hydraulic pressure. An exemplary manual valve of an automatic transmission includes a valve body and a valve spool slidably provided in the valve body. The valve body includes a spool receiving part, a first port, a second port, and a third port. The valve spool includes an underdrive land assembly and a reverse land assembly, wherein at least one of the underdrive land assembly and the reverse land assembly has a groove formed on an exterior circumference thereof along a sliding direction of the valve spool such that oil flows therethrough when hydraulic pressure is released.

The invention relates to a speed ratio change operation device and a speed changer. A speed ratio change operation device includes: a case (101); a shift select lever (103) housed in the case (101) and provided slidably in a direction of an axis and rotatably in a circumferential direction; a speed ratio change operating lever (250) that operates the shift select lever (103); a select-purpose cam (160) that is fixed to the shift select lever (103) and rotates about the shift select lever (103); a lock ball (150) that presses the select-purpose cam (160); and a bevel portion (163, 164) that is formed in an end portion of a press surface (162, 163, 164) of the select-purpose cam (160) which is pressed by the lock ball (150), the end portion being positioned in a shift displacement direction in which the shift select lever (103) is displaced at the time of a shift operation. The bevel portion is inclined so that a point on the bevel portion approaches the shift select lever (103) as the point is moved in the shift displacement direction. Thus, the operation feeling of the shift operation can be improved.

A clutch sleeve is provided for a shift clutch having a synchronizing device, which includes, but is not limited to a clutch body (8,9), which is connected in a rotationally-fixed manner to gear wheels (4,5) mounted so it is rotatable on a shaft (2) and has coupling teeth (30) and a friction cone as well as synchronizing rings (12,13) having a counter cone and blocking teeth (28), and which has shift teeth (31,32), the clutch sleeve (16) having shift teeth (31,32), which are designed in such a manner that a first group of the shift teeth (27) cooperates with the blocking teeth (28) until a synchronized speed is reached and a second group of the shift teeth (29) engages in the coupling teeth (30) after the synchronized speed is reached.

An apparatus and a method for controlling a creep torque of a hybrid electric vehicle that outputs the creep torque to improve shift feel and fuel consumption of the hybrid electric vehicle, may include the method for controlling a creep torque of a hybrid electric vehicle that may include detecting data of the hybrid electric vehicle for controlling the creep torque, determining whether a vehicle speed is greater than or equal to a predetermined speed and the hybrid electric vehicle is shifting from a current shift stage to 1 stage when the current shift stage is 3 stage or 2 stage, applying a creep torque factor depending on a shift stage and a brake amount when the hybrid electric vehicle is shifting from 3 stage or 2 stage to 1 stage, and controlling a motor to output the creep torque to which the creep torque factor is applied.

The invention discloses a method for clutch fluid charging control and a double clutch transmission system. A clutch hydraulic control method may include performing a clutch pack flow rate control, which pre-fills a flow rate for clutch engage in a clutch pack of a clutch before shifting, when a shifting attempt is detected in a clutch controller.

The invention belongs to the field of automobile transmissions and particularly relates to a system for adjusting shifting force of a manual transmission. The system is characterized by being composed of two independent subsystems. One subsystem is a gear shifting execution system which comprises a synchronizer, a gear shifting fork, a fork shaft, a guide block and a gear shifting poking head. The gear shifting execution system is used for specifically executing gear shifting operation of the transmission, and the gear shifting poking head rotates to drive the guide block, the fork shaft and the gear shifting fork to move along the axial direction of the transmission and finally drive the synchronizer to achieve gear shifting. The other subsystem is a shifting force adjusting system which can adjust the shifting force through a replaceable self-locking spring device according to the shifting force, the self-locking spring device is directly fastened on an upper cover through threads, and a self-locking device can be replaced according to different gear shifting force requirements to achieve quick adjustment. The system improves adjusting accuracy and efficiency of the shifting force, improves system working reliability and structure compactness by adopting the shifting force adjusting system which is more scientific and reasonable.

A servo operation apparatus for a transmission comprising an input shaft to which the shift-change operation force is mechanically transmitted from a shift lever, a servo unit for boosting the shift-change operation force by feeding a working fluid, and a valve device which feeds the working fluid to, or drains the working fluid from, the servo unit depending upon the shift-change operation of the shift lever, wherein provision is made of an working fluid feed control means which feeds the working fluid in such a manner that the pressure of the working fluid in the servo unit is raised with a steep gradient in the former half until a predetermined initially raised pressure value is reached and, thereafter, is raised in the latter half with a gradient less steep than that of said former half. Or, when the apparatus is equipped with a reaction device which imparts reaction to the shift-change operation force transmitted to the input shaft by utilizing the working fluid, provision is made of a working fluid feed control means which feeds the working fluid in such a manner that the rise of the pressure of the working fluid in the reaction device is delayed behind the rise of the pressure of the working fluid in the servo unit.

A control apparatus of an automatic transmission includes an electric hydraulic pump including a motor and a pump, an actuator for engaging or releasing a friction element by controlling a hydraulic pressure discharged from the pump, and a transmission control unit (TCU) for correcting a control signal to control the actuator depending on a dynamic characteristic coefficient of the friction element and the actuator during shifting when outputting the control signal to the actuator.

The invention provides a separable disc plate with a function of cushioning. The separable disc plate comprises a friction plate fixed along the circumference of a disc body of a clutch disc. The separable disc plate may include a plate body which is plate-shaped and fixed to the disc body, and a fixing device formed on the plate body and used for elastically connecting a pair of disc plates in the direction of opposite push of the pair of disc plates facing each other.

The invention provides a gear shifting and vibration reduction assembly and a car gear shifting system, and relates to the technical field of the car gear shifting system. The gear shifting and vibration reduction assembly comprises a gear shifting arm, a balancing weight structure and a vibration reduction structure; the gear shifting arm and a speed changer are connected through a gear shiftingrod pin; the balancing weight structure is rotationally connected with the gear shifting rod pin; the gear shifting arm and the balancing weight structure are connected through a connector; the gear shifting arm can drive the balancing weight structure through the connector to rotate around the gear shifting rod pin; and the vibration reduction structure is arranged between the connector and the gear shifting arm and/or between the connector and the balancing weight structure. The car gear shifting system at least comprises a gear shifter, a gear shifting flexible shaft, the speed changer andthe gear shifting and vibration reduction assembly; the gear shifting flexible shaft is connected between the gear shifter and the gear shifting arm; and the gear shifting arm is arranged on the speedchanger. The problem that in the prior art, a balancing weight is directly connected with a gear shifting arm, so that vibration is transmitted to a gear shifting handball to easily cause numbness issolved.

The invention discloses a gear shifting push-pull cable. The gear shifting push-pull cable comprises a mounting framework, pistons and a pull cable; an accommodating cavity is formed in the mounting framework; the pistons are arranged in the accommodating cavity in a sliding mode, and a liquid storage cavity used for accommodating hydraulic oil is isolated in the accommodating cavity; one sectionof pull cable penetrates through the first end of the mounting framework, one end of the pull cable is connected with one, close to the first end, of the multiple pistons, and the other end of the pull cable is used for being connected with a transmission gear-shifting rocker arm; and the other section of pull cable penetrates through the second end of the mounting framework, one end of the pull cable is connected with one, close to the second end, of the multiple pistons, and the other end of the pull cable is used for being connected with a shifter gear-shifting rocker arm. The invention further discloses an automobile which comprises the gear shifting push-pull cable. Movement synchronism of the two sections of pull cables is guaranteed through the hydraulic oil and the pistons in the accommodating cavity, and the situation that a gear cannot be engaged due to asynchronous movement of the two sections of pull cables is avoided; two-way transmission of vibration between a gear shifter and a transmission is achieved; and high-frequency low-pair vibration can be converted into heat energy of the hydraulic oil, so that transmission of vibration and noise is blocked, and the gear shifting hand feeling is optimized.

The invention discloses a friction element for transmission, and relates to a technology which effectively absorbs a gear shifting impact by sequential fastening discs or plates to one another by a friction element. The friction element includes: a multi-plate disc set having discs and/or plates, and a fastening device having springs. In particular, the springs may start to be compressed from a spring having the smallest spring constant to a spring having a greater spring constant so as to sequentially fasten the discs and plates to one another so that the amount of a change in a stroke of a piston with respect to a change in an operation force of the piston is sequentially reduced.