JPS5924297B2 - Electronically controlled automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled automatic transmission that completely automates a parallel shaft transmission using electronic control and fluid pressure.

゛A predetermined shift signal is issued in response to the control lever position signal, vehicle speed signal, throttle opening signal, etc. manually operated by the driver, and is supplied to the hydraulic chambers of the select cylinder and shift cylinder in accordance with this predetermined shift signal. Parallel shaft type transmissions are already known in which the pistons in each cylinder are actuated by controlling the hydraulic pressure applied to the transmission, thereby operating a select shaft and a shift shaft in the transmission to change the gear ratio.

However, in this type of transmission, a synchronizing mechanism is attached to the forward gears such as 1st, 2nd, 3rd, and 4th gears, resulting in a synchronous mesh type, so the rotational speed of the gears that mesh with each other is high. Even if they are different, since both gears are synchronized and then engaged during the shift process, problems such as gear noise will not occur. There are many structures that have been adopted, and in this selective sliding mesh, the gears slide and mesh, so the tips of the gear teeth collide and the gears mesh. Since this situation occurs when the relative rotational speed difference between the two gears is very large, the problem of gear noise also occurs at the same time.

However, when automating this type of parallel shaft transmission,
The challenge was how to smoothly shift gears to reverse gear.

The present invention has been made in view of the above, and an object of the present invention is to provide an electronically controlled automatic transmission that can smoothly shift gears to reverse gear.

In order to achieve this object, the present invention includes a shift command circuit that issues a shift command based on a signal from a control lever position detection sensor, a gear position detection circuit that detects a gear position in a transmission, and a shift command circuit that issues a shift command based on a signal from a control lever position detection sensor. a gear position comparison circuit that compares the output signals of the circuit and the gear position detection circuit;
A clutch control device that engages and disengages the clutch based on the output of the gear position comparison circuit, a throttle valve opening/closing device that opens and closes the throttle valve based on the output of the gear position comparison circuit, and select and shift levers of the transmission mechanism. In the electronically controlled transmission, the electronically controlled transmission includes a hydraulic device for driving a gear shift lever that switches to a command gear position by the user, and control circuits that control the clutch control device, the throttle valve opening/closing device, and the hydraulic device for driving the gear shift lever. A path for a shift command signal outputted to switch each lever to reverse gear is provided separately from a route for other shift command signals, and a delay circuit for delaying transmission of the shift command signal is provided in the reverse gear path. The main objective is to obtain an electronically controlled automatic transmission characterized by incorporating a shift control circuit.

The present invention will be described below with reference to embodiments shown in the drawings.0 Fig. 1 is a block diagram of an automatic transmission of the present invention, in which 1 is a lever position detection sensor of a control lever manually operated by a driver; Each position signal generated according to the position of is input to the speed change command circuit 2.

Reference numeral 3 designates a shift position determination circuit to which only the D (drive) position signal from the lever position detection sensor 1 is input, and calculates from the signals of the vehicle speed sensor 4, throttle opening sensor 5, etc. to determine the optimum position for the vehicle under the current conditions. A shift signal for the gear position is output to the shift command circuit 2.

Reference numeral 6 indicates a select lever 8 and a shift lever 9tJIJ of the transmission mechanism 7 in accordance with the transmission command signal from the transmission command circuit 2.
This is a select and shift solenoid drive circuit which controls the select finger 4>10 and shifts/+11 to each pair of solenoid valves 12, 13 and 14, 15, respectively. Hydraulic pressure from an external hydraulic source is supplied to the select cylinder 16 and shift cylinder 17 to switch the select lever 8 and shift lever 9 to a predetermined gear.

A gear position detection circuit 18 detects the gear ratio in the transmission mechanism 7, and receives signals from a select position sensor 19 and a shift position sensor 20 that detect the select lever 8 position and the shift lever 9 position.

The output signal of the gear position detection circuit 18 is then inputted to the select/shift solenoid drive circuit 6 and compared with the signal from the shift command circuit 2. If the two signals are different, the solenoid valves 12, 13 are and/or 14 and 15, and if they match, the operation is continued.

The other output signal of the gear position detection circuit 18 is input to the gear position comparison circuit 21 and compared with the output signal from the shift command circuit 2. If the two signals are different (NO), automatic shift operation is performed. Therefore, the closer 23 of the throttle valve opening/closing device 22 and the cut device 26 of the clutch control device 25
send signals to each.

If both signals match (YES), there is no need to change gears, so the opener 27 of the throttle valve opening/closing device 22
Then, a husband signal is sent to the engagement device 28 of the clutch control device 25.

29 is a clutch off sensor that detects the state in which the clutch control device 25 is cut, and selects and outputs an output signal.
The select and shift levers 8 and 9 can only be operated when the clutch is disengaged by sending the signal to the shift solenoid drive circuit 6.

Further, 30 is an R alarm which is activated by the R position signal from the gear position detection circuit 18 only when the gear position is in reverse.

With the above configuration, the transmission mechanism 7 is switched to a predetermined gear according to the control lever position, but the present invention further includes the following configuration to enable smooth gear shifting to reverse gear. .

That is, as shown by the thick line in the figure, among the signals output from the shift command circuit 2, the reverse gear signal (R signal) is separated from the path X1 of the other signals (forward gear, neutral input signal). The signal is inputted to the select shift solenoid drive circuit 6 through a path X2, and an R shift control circuit 32 is interposed in this path X2.

This R shift control circuit 32 has a delay circuit 33, and preferably has a permission circuit 34 downstream of this delay circuit 33.

The delay circuit 33 delays and outputs the signal from the shift command circuit 2 by a predetermined time so as to satisfy the requirements described later.

The permission circuit 34 receives a signal from the vehicle speed sensor 4, turns on the circuit when the vehicle speed is less than a predetermined speed (for example, 7 km/h), and transmits the output of the delay circuit 33 to the next circuit, and turns the circuit on when the speed is higher than that. is turned off.

Therefore, with this configuration, when the R position (reverse gear) is selected on the control lever 1 and the R signal is output from the shift command circuit 2, this R signal is output from the gear position detection circuit 18 in the gear position comparison circuit 21. The signal is compared with the signal, and if there is a difference, the throttle closer 23 and the clutch cut device 26 are operated as described above to enable a speed change operation (gear change).

On the other hand, the R signal is input to the R shift control circuit 32, delayed by a predetermined time in the delay circuit 33, and then reaches the permission circuit 34. If the circuit 34 is on, the R signal is input to the select shift solenoid and the drive circuit 6. A select command and a shift command are issued to switch the select and shift levers 8 and 9 to the R position.

By delaying the R signal for a predetermined period of time, even if the clutch is disengaged, the gear is not immediately switched to reverse gear, and the inertia bodies in the transmission mechanism 7, that is, the clutch, counter gear, reverse Sufficient time for the idler gear etc. to be decelerated due to oil stirring resistance, etc. (1 to 2 seconds is sufficient in principle, but if it is too long, drivability will be impaired, so about 1 second is preferable).

), the switching operation begins.

Therefore, the relative rotational speed difference between the reverse main gear and the reverse idler gear is small, and both gears can be meshed smoothly without gear noise or the like.

In such a case, if the vehicle is moving forward at a predetermined speed or higher, there is a risk that a shock will occur or the gear will be damaged when changing gears to reverse gear, so the signal from the vehicle speed sensor 4 indicates that permission is given when the vehicle speed is, for example, 7 km/h. The circuit 34 is turned off to cut off transmission of the R signal and prevent gear change to reverse gear.

When the vehicle speed is low, shocks are unlikely to occur, so the signal from the delay circuit 33 is immediately transmitted to the select/shift solenoid drive circuit 6 to operate the transmission mechanism 7.

Furthermore, in this embodiment, by controlling the operation of the clutch cut device 26 to move earlier depending on the gear position and throttle opening, it is possible to more reliably prevent so-called clunking noise, gear noise, etc.

That is, as shown in the figure, in the circuit 35 that inputs the output of the throttle opening sensor 5 and the output of the gear position detection circuit 18, the throttle opening is set to dog (when the engine speed is higher than the idle speed (not including idle speed)). By configuring the clutch cut device 26 to operate whenever the gear position is in neutral, as shown in FIG.
When the rotational speed is equal to or higher than the idle speed at the N position, the clutch can be disengaged to lower the gear rotational speed in advance, thereby ensuring that gear noise is prevented by the aforementioned delay circuit 33.

In other words, when the engine is in idle rotation at the N position, even if the clutch is disengaged after receiving the R signal, it is possible to sufficiently reduce the speed of the gears etc. using only the delay circuit 33.
Since the gear rotation becomes faster when the rotation is above the idle speed, there is a possibility that the gear rotation speed cannot be sufficiently reduced within the predetermined time by the action of the delay circuit 33 alone. This is done so that the condition is as follows.

Incidentally, FIG. 2 is a diagram showing an automatic shift operation to reverse gear.

Here, if the tips of the gear teeth interfere with each other and the R shift becomes impossible, the R alarm 30 will not operate, so the driver will immediately know that the R shift is defective, and then push the control lever 1 again to the R shift.
By operating -NR, the clutch is connected at N and the gear is rotated, changing the state of the gear and making it possible to shift to R again.

If the lever position detection sensor 1 is configured to only detect each shift command as shown in the first diagram, the control lever can be installed away from the transmission mechanism 7, and the mounting device, operation method, etc. can be freely set. can do.

Also, as shown by the chain line, when the accelerator pedal is depressed, the delay circuit 33 is not activated and the signal is directly sent to the permission circuit 33.
4, the clutch is cut early by the circuit 35, so that the R gear can be engaged more quickly.

In summary, according to the electronically controlled automatic transmission of the present invention, the shift command signal for reverse gear is delayed by a predetermined period of time and outputted to the select/shift solenoid drive circuit to operate the shift mechanism. Between clutch disengagement and R shift, the rotational speed of the rotating inertial body is reduced due to mission oil agitation resistance, so the rotational speed of the counter gear, idler gear, etc. decreases, and the gears mesh with each other due to interference between gear teeth. This prevents gears from locking, ensuring reliable gear engagement, and preventing gear noise as well as clunking noises.
This provides excellent effects such as preventing shock and the like and allowing smooth R shift operation.

[Brief explanation of the drawing]

- Fig. 1 is a block diagram of the present invention, and Fig. 2 is a block diagram of automatic shift operation to reverse gear. 1... Lever position detection sensor, 2...
Speed change command circuit, 4...Vehicle speed sensor, 5...
・・Throttle opening sensor, 6・・・・Select・
Shift solenoid drive circuit, 7... Speed change mechanism,
8...Select Leno\-19...Shift lever-118...Gear position detection circuit, 21.
... Gear position comparison circuit, 22 ... Throttle valve opening/closing device, 25 ... Clutch control device, 32 ... R shift control circuit, 33 ...
...Delay circuit, 34...Permit circuit, 35...
...1 circuit, X2...Reverse gear (R) shift command circuit.

Claims (1)

[Claims] 1 A shift command circuit that issues a shift command based on a signal from a control lever position detection sensor, a gear position detection circuit that detects a gear position in the transmission, and a gear that compares output signals of the shift command circuit and gear position detection circuit. a position comparison circuit, a clutch control device that engages and disengages a clutch based on the output of the gear position comparison circuit, a throttle valve opening/closing device that opens and closes a throttle valve based on the output of the gear position comparison circuit, and a selection of a transmission mechanism;
An electronically controlled automatic transmission consisting of a hydraulic device for driving the gear shift lever that moves each lever to switch to a command gear position, and control circuits that control the clutch control device, the throttle valve opening/closing device, and the hydraulic device for driving the gear shift lever. A path for a gear change command signal outputted to switch each of the select and shift levers to reverse gear is provided separately from a route for other gear change command signals, and transmission of the gear change command signal is delayed within the reverse gear path. What is claimed is: 1. An electronically controlled automatic transmission characterized in that an R shift control circuit having a delay circuit is installed.