CN103062396B - A kind of halting mechanism being applied to AMT variator - Google Patents

Abstract

A parking mechanism applied to an AMT transmission, comprising a transmission control unit TCU, a P gear sensor, and a P gear mechanical actuator. The transmission mechanism in the body, the parking cam, the parking ratchet and the parking pawl. The present invention realizes the P gear parking function of the AMT transmission by adding a set of P gear parking mechanism to the traditional AMT transmission, and adding a P gear control and driving unit in the TCU control unit. The P gear parking mechanism is simple in structure and easy to operate. The manufacturing method is low in cost and convenient in control, and can be widely applied to the AMT transmission to realize parking of the AMT transmission.

Description

A Parking Mechanism Applied to AMT Transmission

technical field

The invention relates to a gear position control mechanism of a transmission, in particular adding a P-gear parking mechanism to an AMT transmission to realize the P-gear parking function of the AMT transmission.

Background technique

The automatic transmission is easy to operate and brings great convenience to people's driving. The AMT automatic transmission is based on the traditional manual transmission by adding corresponding actuators and control units to realize automatic gear shifting. The AMT transmission has the highest transmission efficiency of the manual transmission. Efficiency, good power economy, low cost, but also the ease of operation of an automatic transmission.

Because the selection and shifting of the existing AMT is to send a signal to the TCU through the electronic shifter, and to realize the selection and shifting through the actions of the TCU to control the motor, etc., there is no cable-type shifting operating mechanism like the AT, CVT, and DCT. The restriction of this structure of AMT, existing AMT only realizes parking by handbrake when parking, does not have P file parking function.

Contents of the invention

Aiming at the structural limitations of the AMT transmission itself, which does not have the functional characteristics of P gear parking, the present invention provides a set of parking mechanism and control method applied to the AMT transmission, and realizes P gear parking through the P gear mechanical actuator and the electronic control unit.

Technical scheme of the present invention is as follows:

A parking mechanism applied to an AMT transmission includes a transmission control unit TCU, a P gear sensor and a P gear mechanical actuator. The P gear mechanical actuator includes a parking motor arranged outside the transmission case, a transmission mechanism, a parking cam, a parking ratchet and a parking pawl arranged inside the transmission case.

The transmission mechanism is composed of a pair of worm gear assembly, a gear and a screw; the worm of the worm gear assembly is connected to the parking motor, and the rotation of the motor is transmitted to the worm wheel by the worm; the worm gear shaft of the worm gear assembly is on the same The shaft is equipped with the gear, and the gear meshes with the screw to drive the screw to move up and down;

The upper end of the screw rod fixes the parking cam, which moves up and down together with the screw rod, and one end of the parking cam and the parking pawl are in close contact with each other through the surface kinematic pair, and the up and down movement of the parking cam is transformed into a parking pawl through the surface kinematic pair. The horizontal back and forth swing of the paw;

The other end pawl of the parking pawl corresponds to the tooth groove on the outer circumference of the parking ratchet on the transmission shaft, and the middle is connected with the transmission case through the parking pawl pin and placed in the transmission case. There is a parking pawl return spring on the upper sleeve, one end of the parking pawl return spring is positioned and connected to the parking pawl, and the other end is positioned and connected to the cylindrical hole of the transmission case;

One end of the worm gear shaft protrudes from the transmission case and is connected to the P gear sensor. The P gear sensor tests the angle that the worm wheel has turned, and transmits the electrical signal to the transmission control unit TCU to determine the position of the P gear cam, thereby Decide when to send a working signal to the parking motor to realize the control of P gear.

The transmission control unit TCU has a built-in P gear control module, and is connected to a parking motor through a driving port to realize the control of P gear parking.

Further, the P gear control method applied to the AMT transmission of the above-mentioned parking mechanism is as follows:

①. Start the engine in P gear: After the key switch is powered on, the TCU detects that the actual gear position of the transmission is in P gear through the P gear sensor of the parking mechanism, and the engine does not start. It is determined that the vehicle is in the P gear to start the engine state;

The TCU checks whether the brake signal and the P gear signal are valid. If one signal is invalid, the transmission maintains the current gear position. If the signal is valid, the TCU detects the actual gear position of the transmission. If it is not in the N gear, it executes the N gear shift command until the actual After the gear position is in the N gear, the clutch is disengaged, the starter motor works, the engine starts, and the shifter exits the P gear, releases the parking state, and waits for the next gear shift command;

②. When the vehicle is powered on or the engine is started, the P gear is engaged: After the key switch is powered on, the TCU detects that the shifter has a P gear signal, and the P gear sensor detects that the transmission is not in the P gear, and then judges At this time, when the vehicle is powered on or the engine is started, it should be in the P file state;

The TCU detects whether the brake signal and the P gear signal are valid. If one of the above signals is invalid, the current gear will be maintained. If the signal is valid, it will be checked whether the actual gear of the transmission is in the N gear. If it is not in the N gear, perform the action of shifting to the N gear. , until it detects that the actual gear position is N, the TCU drives the parking mechanism to perform the action of shifting to the P gear. After the P gear is shifted, the key switch is powered off and the clutch is closed.

The present invention realizes the P-gear parking function of the AMT transmission by adding a set of P-gear parking mechanism on the traditional AMT transmission, adding the P-gear control and drive unit in the TCU control unit, and the P-gear parking mechanism has a simple structure , easy to manufacture, low in cost, convenient in control, and can be widely applied to the AMT transmission to realize parking of the AMT transmission.

Description of drawings

Figure 1 P gear mechanical actuator with motor;

Figure 2 shows the knob-type shifter with the P gear added;

Figure 3 shows a schematic diagram of the key components of the actuator;

Figure 4 shows the control relationship diagram of the P file vehicle;

Figures 5 and 6 show the logic flow chart of hanging the P file;

In the figure: 011 angle sensor, 010 parking ratchet, 009 pawl pin, 008 pawl torsion spring, 007 parking pawl, 006 parking cam, 005 screw, 004 gear, 003 worm gear, 002 worm, 001 parking motor.

detailed description

Further illustrate structure of the present invention below in conjunction with accompanying drawing:

As shown in Figure 1, the P gear mechanical actuator provided by the present invention includes a parking motor 001 arranged outside the transmission case, a worm gear assembly arranged inside the transmission case, a gear 004, a screw rod 005, a parking ratchet 010 and Parking pawl 007.

The worm gear assembly consists of a worm 002 and a worm gear 003 on the worm shaft. One end of the worm shaft protrudes from the transmission case and is connected to the P gear sensor 011. The signal is transmitted to the TCU to determine the position of the P gear cam, so as to decide when to send a working signal to the parking motor, and realize the control of the P gear in turn. The parking motor is connected with the worm, and the worm is meshed with the worm gear.

A gear 004 is coaxially installed on the worm shaft, which meshes with the screw 005. The upper end of the screw rod 005 is integrally equipped with a parking cam 006, which drives the screw rod through the gear, thereby driving the parking cam to move up and down. The up-and-down motion of the car cam is transformed into the horizontal back and forth swing of the parking pawl.

The other end pawl of the parking pawl 007 is correspondingly matched with the tooth groove on the outer circumference of the parking ratchet 010 on the transmission shaft.

The parking pawl 007 is connected with the transmission case through the parking pawl pin 009, and placed in the transmission case, the two ends of the parking pawl pin 009 are matched with the pin holes on the case; There is a parking pawl return spring 008, one end of the parking pawl return spring 008 is positioned and connected to the parking pawl 007, and the other end is positioned and connected to the cylindrical hole of the transmission case.

The working method of this actuator: the parking motor 001 drives the worm 002, and then drives the worm wheel 003, and drives the screw 005 through the action of the worm shaft and the gear 004, thereby driving the parking cam 006 to rotate, through the parking cam 006 and the parking pawl One end of 007 contacts to drive the back and forth movement of the parking pawl, and the parking pawl and the parking ratchet 010 act to realize the parking function.

As shown in Figure 2, it is a knob-type shifter. The entire shifter has gears such as P, R, N, and D, and the corresponding gears are triggered by rotating the knob. The knob-type shifter can perform the rotary shifting action only after the knob is raised. When there is no need to shift gears, the knob is lowered, and the knob-type shifter can increase or decrease gears and function keys reasonably according to the gear position and function needs.

As shown in Figure 3, the relationship between the movement and stress of the parking cam 006 and the parking pawl 007 is achieved. The engagement and disengagement of the P gear is achieved through the contact between the cam and one end of the pawl and the action of the torsion spring 008.

Figure 4 shows the relationship diagram of the entire P gear. First, the knob shifter inputs the P gear request, and the transmission control unit judges the conditions for shifting into the P gear. When the conditions are satisfied: vehicle speed = 0km/h, the brake signal is valid, and the shift When the gear shifter is in the P gear, the request for shifting into the P gear is executed, the transmission control unit inputs the drive request to the parking control unit, the parking control unit drives the motor to execute the gear shift request, and at the same time, the vehicle instrument obtains the current gear from the transmission control unit. Gear position information; if the TCU detects that the conditions for shifting into the P gear are not satisfied, the action of shifting into the P gear will not be performed, and the current gear will be maintained.

Figure 5 and Figure 6 show the logic flow chart of the AMT transmission P gear parking control.

As shown in Figure 5, when the P gear is engaged, start the engine. First, the key switch is powered on, and the TCU detects whether the brake signal and the P position signal are valid. If the above conditions are not met, the transmission will maintain the current gear position. If the conditions are met, the TCU will detect the actual gear position of the transmission. N gear command, until it is detected that the actual gear position is in N gear, the clutch is disengaged, the starter motor works, the engine starts, and waits for the next action command.

As shown in Figure 6, when the vehicle is powered on or started, the P gear is engaged. First, the key switch is powered on, the TCU detects the brake signal and the P gear position signal. If one of the above signals is invalid, the current gear position will be maintained. If the signal is valid, it will be checked whether the actual gear position of the transmission is in the N gear. If it is not in the N gear, switch to N After the actual gear position is detected to be N, the TCU controls the motor to execute the action of shifting to the P gear. After the P gear is shifted, the key switch is powered off and the clutch is closed.

Claims (1)

1. it is applied to a halting mechanism for AMT variator, including transmission control unit TCU, P shelves sensor and P shelves machinery Actuator；It is characterized in that: described P shelves mechanical actuating mechanism includes the parking motor being located at outside mission case, is located at Drive mechanism, parking cam, parking ratchet wheel and park pawl in transmission case body；

Described drive mechanism is made up of a secondary worm and gear assembly, a gear and a screw rod；Described worm and gear assembly Worm screw is connected with parking motor, and the rotation of motor is passed to worm gear by worm screw；On the worm-wheel shaft of described worm and gear assembly coaxially Being equipped with described gear, described gear engages with described screw rod, drives screw rod to move up and down；

Parking cam is fixed in the upper end of described screw rod, moves up and down with screw rod, and parking cam passes through with park pawl one end Face kinematic pair against, put before and after by the effect of face kinematic pair the up and down motion of parking cam is changed into the level of park pawl Dynamic；

The teeth groove corresponding matching of the parking ratchet wheel excircle on the other end ratchet of described park pawl and transmission shaft, parking spine It is connected with mission case by park pawl pin in the middle of pawl, is placed in transmission case body, detent pin is cased with a parking Ratchet return spring, this park pawl return spring one end is located by connecting in park pawl, and the other end is located by connecting on speed change In the cylindrical hole of device casing；

One end of described worm-wheel shaft is stretched out mission case and is connected with P shelves sensor, is turned by P shelves sensor test worm gear The angle crossed, and pass to transmission control unit TCU by the signal of telecommunication, it is judged that the position of P shelves cam, thus when determine Parking motor is sent working signal, it is achieved the control of P shelves；

Described transmission control unit TCU built-in P shelves control module, drives port to connect parking motor by one, it is achieved P shelves The control of parking；

Control method is as follows:

1. .P shelves start electromotor: after key switch powers on, TCU detects variator by the P shelves sensor of halting mechanism Actual-gear is at P shelves, and electromotor is not actuated, it is determined that vehicle is to start engine condition at P shelves；

TCU detection brake signal and P shelves signal are the most effective, if there being an invalidating signal, variator keeps current gear, as Really signal is effective, and TCU detects variator actual-gear, if not at N shelves, then performs to hang the instruction of N shelves, until actual shelves being detected Position after N shelves, clutch separation, start motor work, engine start, selector exited P shelves, release parked state, etc. Treat next shift command；

2.. vehicle powers on or under engine start state, is linked into P shelves: after key switch powers on, and TCU detects that selector is at P Shelves, and detect that variator is not linked into P shelves by P shelves sensor, then judge it is now to power on or engine start shape at vehicle Under state, P shelves state should be linked into；

The most effective by TCU detection brake signal and P shelves signal, if brake signal and P shelves signal have an invalidating signal, then protect Holding current gear, if signal is effective, then whether detection variator actual-gear is at N shelves, does not performs to hang the action of N shelves at N shelves, Until detect actual-gear after N shelves, TCU drives halting mechanism to perform to hang the action of P shelves, is linked into after P shelves under key switch Electricity, clutch closes.