JPS61124750A - Control device of gear shift actuator - Google Patents

Abstract

PURPOSE:To perform prompt action of gear shift change in a manner preventing the generation of a gear sound, by previously determining a duty pulse in accordance with a difference between the present stroke of an actuator rod and its target stroke and controlling quickly and slowly a speed of the gear shift action. CONSTITUTION:A control device, repeatedly comparing a stroke of an actuator rod 5 with the target stroke, updates duty ratio at every predetermined time. And the device stops operation of all valves 8, 9, 11, 12 when the present stroke coincides with the target stroke. Here a duty control is executed on the basis of a shift in map previously stored in memory of a controller 15, and after the present stroke reaches a position in an about 2mm distance to the position in the vicinity of the target stroke, the control device, suppressing a duty width of the discharge pressure valve 11 or 12 to a small value and slowly performing shift action, enables a gear sound to be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a gear shift actuator equipped with a three-position cylinder mechanism.

(Conventional technology) A vehicle with an internal combustion engine, such as a car.

In order to effectively utilize the output of the internal combustion engine, a transmission is provided between the internal combustion engine and the drive wheels. and.

For example, when a vehicle travels at a low speed, the gear ratio of the transmission is increased to increase the rotational speed of the internal combustion engine.

By the way, in conventional transmissions where gear switching is performed manually, when changing gears, the rotation of the internal combustion atSll is matched, the shift lever is moved, and the drive gear is sensed to have rotated in synchronization with the main shaft. in,
The shift lever is pushed in to prevent shifting and shifting, as well as to prevent gear noise due to incomplete synchronization.

On the other hand, automatic transmissions have recently been provided that automatically change gears of the transmission using a hydraulic mechanism controlled by an electronic control device.

(Problem to be Solved by the Invention) However, this automatic transmission is configured to operate a hydraulic gear shift unit provided for each shift line with constant force and speed over the entire stroke based on shift instruction data. Therefore, there was a problem in that the drive shaft and the main shaft engaged with each other before they were synchronized, which was likely to cause gear noise and damage to the synchronization mechanism. In other words, since there is no rotation matching operation as described above based on one person's intuition, gear noise occurs during mechanical meshing operation.

However, a method has also been considered in which a throttle valve is inserted into the system of the above-mentioned hydraulic gear shift unit and the main shaft is gradually connected to the drive shaft at the same speed for each shift line using slowly changing oil pressure. It is difficult to set the optimum shift conditions for each gear, and it takes too much time to change gears, and it is inevitable that the gears will rumble in certain gears and damage to the synchronization mechanism will occur.

In addition, the applicant has provided two oil chambers of the three-position cylinder mechanism.
A gear shift actuator that supplies and discharges hydraulic pressure by controlling on/off a valve connected to this oil chamber has been proposed in Japanese Patent Application No. 57-230310, etc., but when shifting gears to neutral, the above Since the piston is configured to collide with the mechanical stopper using the oil pressure difference between the two oil chambers, there has also been a problem in that the durability of the mechanical stopper and the piston is significantly deteriorated.

The present invention has been made by focusing on such conventional problems, and includes providing a valve dedicated to supply pressure and a valve dedicated to exhaust pressure in each oil chamber, and selects one of these valves to be duty-controlled to shift gears. To provide a control device for a gear shift 7 actuator that can increase the shift speed until the actuator rod reaches a target stroke position and then decrease the shift speed during neutral control. .

(Means for Solving the Problems) The present invention connects a supply pressure valve and a discharge pressure valve to each of two oil chambers separated by a piston moving inside a cylinder of a cylinder mechanism that takes three positions, and connects an actuator rod The gear shift speed is controlled slowly and rapidly using a duty pulse that corresponds to the difference between the current stroke and the target stroke.

(Function) The target stroke is the stroke of the 7-cut unit rotor until the main gear is fully engaged with the drive gear, and the stroke of the 7-cut unit rod until the piston contacts the mechanical stopper during neutral shift. With the stroke as a target stroke, the set stroke position near each target stroke and the operating duty of the supply pressure valve and exhaust pressure valve for this stroke position are stored in the memory of the controller, and the current stroke and target stroke of the actuator loft are stored. A duty pulse corresponding to the difference in speed is output to each pressure supply valve and exhaust pressure valve, and the gear shift speed is automatically controlled to be slow or fast. In other words, the gear shift speed is set rapidly up to the set stroke and then slowed down to the target stroke.

(Example) FIG. 1 shows a control device for a gear shift actuator according to the present invention. In the same figure, l is a gear shift actuator with a three-position Schilling mechanism. In other words, this actuator l is configured to be able to stop at three positions,
It consists of a useful cylinder 2, a first piston 3, and a cylindrical second piston 4 into which the first piston 3 is fitted.

A seven-stroke rotary shaft 5 of the first piston is engaged with an internal lever of a transmission (not shown). This actuator l is in a neutral position when oil pressure is applied to the two oil chambers 6 and 7, and oil is in the oil chamber 6.

When pressure is applied, the first piston 3 moves to the left in the figure along with the second piston, and when oil pressure acts on the oil chamber 7, only the first piston 3 moves to the right in the figure. do.

Further, 8.9 is a pressure supply valve which is a 111m valve for supplying oil pressure from the oil pressure source 10 to the oil chambers 6 and 7, respectively, and 11.12 is a pressure supply valve for returning oil from the oil chambers 8 and 7 to the tank 13. These valves 8, 9, 11 are exhaust pressure valves.
．． 12 is one with excellent responsiveness that should be controlled by a duty pulse. Further, 14 is a stroke sensor that detects the stroke of the actuator rod 5.

Reference numeral 15 denotes a controller as an electronic control device. The controller 15 captures the output of the stroke sensor 14, etc., into a data memory via an input/output interface, and compares the captured data with predetermined target data corresponding to the captured data to a processing device. 8.9. kl, 12 to operate and control the gear shift actuator at the optimum stroke amount and speed to perform gear shifting work. Note that supply pressure valves a and 9 are normally closed types;
The exhaust pressure pulps 11 and 12 are of normally open type.

Next, one effect will be described.

First, when shifting the gear in the shift 1 direction, the supply pressure pulp 9 is opened, the exhaust pressure valve 12 is closed, hydraulic pressure is supplied to the oil chamber 7 from the oil pressure source IO, and the exhaust pressure is discharged with the supply pressure valve 8 closed. Pressure valve 11 is activated by duty pulse wIIA! lJ
By doing so, the seven cutter rods 5 can be moved to the right at a speed corresponding to the pulse duty. Similarly,
Regarding the shift direction 2, the speed of the actuator rod 5 can be set to an arbitrary speed by duty-controlling the exhaust pressure valve 12 with the supply pressure valve 8 open and the exhaust pressure valve 11 and the supply pressure valve 9 closed. You can move it to the left. Note that the stroke sensor 14 detects the current stroke position of the actuator rod 5, and when the controller 15 determines that the detected stroke has reached the @ mark stroke, the shift of the actuator rod 5 is stopped.

Next, when shifting the gear to neutral, the supply pressure valve 8.9 is opened and the exhaust pressure valve 11.12 is closed to balance the oil pressure in the oil chamber 6.7. to shift. At this time, the force of the hydraulic pressure difference will cause the 7-cut unit rod 5 to hit the mechanical stopper, but the output of the stroke sensor 14 is constantly read, and when the stroke position reaches the scheduled stroke position near the target stroke, the supply pressure valve 8.9 is switched to duty. By controlling.

The actuator loft 5 can be brought into contact with the mechanical stopper at a slow speed.

Figure W42 and Figure 3 are flowcharts of such gear shift-in control and neutral shift control.

In FIG. 2, first, a gear change instruction is given while the vehicle is running, and at this time, the current stroke position of the seven-wheel drive rod 5 corresponding to the gear position is determined.

Read from the stroke sensor 14 into the memory of the controller 15 (step ■) Next, at the gear shift-in, each pulse 11 or 12 is read according to the difference between the target stroke of the 7-cutting valve rod 5 and the above-mentioned current stroke.
The duty is determined from the shift-in pin/(i41K) of the controller 15 (step 2).

For this reason, the controller 15 closes the supply pressure pulp 8, opens the supply pressure valve 9, and closes the exhaust pressure valve 12, as described above, and performs duty control on the exhaust pressure valve 11, or closes the supply pressure valve 8. Open, supply pressure valve 9 closed, exhaust pressure valve 11
is closed, the exhaust pressure valve 12 is duty-controlled, and the actuator rod 5 is moved to the right or to the left, respectively.

Therefore, a gear shift is performed according to the shift-in map (step ■).

Next, the difference in the stroke of the actuator rod 5 with respect to the target stroke is repeatedly compared at every predetermined minute time Tc, and the difference in the stroke of the actuator rod 5 is compared at every predetermined minute time Tc.

The duty ratio is updated every time (To>Tc) (step ■), and when the target stroke and current stroke match, the operation of all valves 8.9°LL and 12 is stopped (step ■). In this case, the determination of the shift-in duty and the duty control of the exhaust pressure valve LL or 12 in step ■ and step ■ are as follows:
The shift-in map is pre-stored in the memory of the controller 15 and is executed based on the shift-in map shown in FIG. To suppress the duty width of 11 or 12 to a small value and to slow down the shift operation.

In other words, gear noise can be prevented by shifting quickly until the synchronization is completed and then slowing down.

Next, when shifting the gear to neutral, the current stroke position of the actuator rod 5 is read from the stroke sensor 14 into the memory of the controller 15 (step ■). The duty of the pressure supply valve 8.9 is determined according to the difference between the neutral position, which is the stroke, and the actually measured current stroke, using the shift removal map shown in Fig. 5 (step ■).In response to the neutral instruction, the controller 15 moves to the determined duty. With the exhaust pressure valve 11.12 closed, the supply pressure valve 8.9 is duty-controlled by the utility pulse (step ■).Next, the difference between the current stroke and the target stroke is calculated every predetermined minute time Tc. (repetitive steps), time T
.

Every time (To>Tc), the duty width is updated,
When the target stroke is reached, each valve 8.9 is deactivated (step 6◆), thus entering the neutral mode. In this case, the duty control of each valve 8, 9 is executed based on the shift removal map shown in FIG. 9
The duty width is kept small and the shift operation is made slow. By doing this, it is possible to prevent the actuator rod from impacting the mechanical stopper during neutral shift of the gear shifter rod 5, thereby preventing damage and breakage of the mechanical stopper and the actuator rod, and increasing the durability of the gear shifter rod 7. You can improve your sexuality. In addition, such a control method/method is applicable to parallel type or X-Y type shift 7
Needless to say, the present invention can also be used in the mechanisms of actuators and select actuators.

(Effects of the Invention) According to the present invention, the speed of the gear shift is controlled slowly and rapidly using a duty pulse predetermined according to the difference between the current stroke and the target stroke of the actuator rod. Without it.

It is possible to perform the stroke rapidly up to the vicinity of the target stroke, and slowly until the subsequent target stroke. As a result, it is possible to perform a quick gear change without causing gear noise, and also to prevent damage to the actuator rod and mechanical stopper.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a gear shift actuator control device according to the present invention. Fig. 1w4z is a flow diagram of gear shift-in control, Fig. 3 is a flow diagram of neutral shift control, Fig. 4 is a duty map of gear shift-in, and Fig. 5 is the duty map with no shift. 1... Gear shift 7 Actuator 2... Cylinder 3... First piston 4... Second piston 5... Actuator rod 6.7... Oil chamber 8.9... Supply pressure Valve 11.12...Exhaust pressure valve 13...Tank 14...Stroke sensor 15...Controller Patent applicant Isuri Motor Co., Ltd. Agent Patent attorney Minoru Tsuji Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] A supply pressure valve and a discharge pressure valve are respectively connected to two oil chambers separated by a piston moving inside the cylinder, and these pressure supply valves and discharge pressure valves are connected to each other by adjusting the current stroke and target stroke of the actuator rod. A control device for a gear shift actuator, characterized in that it is driven by a duty pulse according to a difference.