JPH0241070Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an autoclutch for a vehicle.

[Prior art]

Recently, automatic clutches have been used as automobile transmissions to automatically shift up and down based on the shift map shown in Figure 5, which is preset according to the driving conditions, i.e., vehicle speed and accelerator opening (engine load). Transmissions are widely adopted (for example,
57-163228 etc.). An example of an autocracks used in these automatic transmissions will be explained with reference to FIGS. 5 to 8.

In FIG. 6, a piston 28 is slidably fitted into a cylinder 27 of a clutch booster 22.
defines a working chamber 23, which is communicated with an air reservoir 26 through an inlet valve 24 and with the atmosphere through an outlet valve 25, both of which are connected to a control unit 60. . On the other hand, a piston rod 29 connected to the piston 28 extends outside the cylinder 27, and its end is connected to the release lever 3 of the clutch, and a stroke sensor 21 for detecting the engagement/disengagement position of the clutch is connected in the middle. Then, in response to an actuation signal from the control unit 60, the inlet valve 2
4 opens, the outlet valve 25 closes, and the booster 22
When the is extended, the clutch is disengaged and the inlet valve 2
4 closes, outlet valve 25 opens, and booster 22
When the clutch is contracted, the clutch is connected.

Now, referring to FIG. 7, the operation of the control unit 40 will be explained using a shift up as an example. After detecting the vehicle speed and accelerator opening (step S1), the control unit 60 determines whether or not upshifting is necessary (step S2). If upshifting is necessary, it turns the clutch OFF (step S3) and adjusts the clutch according to the vehicle speed. to shift to the next gear (step S4),
Next, the clutch is turned on (step S5).

The control pattern during shift up of the control unit 60 shown in FIG. 8 will be explained. When the vehicle speed reaches a vehicle speed that requires upshifting (vehicle speed A), the control unit 60 opens the inlet valve 24 while keeping the outlet valve 25 closed, extends the booster 22, disengages the clutch, and shifts the vehicle speed to the next shift stage. Set the engine speed to (rpm B) and shift gears. Then, since the clutch is disengaged, the vehicle speed decreases slightly during the shift (vehicle speed C). The engine rotation also decreases as the vehicle speed decreases (rotation speed D). Here, the outlet valve 25 is opened while the inlet valve 24 is closed, the booster 22 is contracted, and the clutch is connected. By the way, when shifting up on a slope or the like, there is a problem that at the end of the shift, the engine rotation drops too much to the rotation speed Da in accordance with the vehicle speed Ca, resulting in insufficient engine torque and slow recovery of the vehicle speed.

On the other hand, in Utility Application No. 58-99531, the applicant maintains the friction clutch in a half-clutch state for a predetermined period of time in order to prevent the engine from stalling when starting and to obtain smooth starting similar to that of a torque converter. We are proposing a vehicle autoclutch that is controlled as follows.

[Purpose of invention]

The present invention was developed in view of the above-mentioned problems, and its purpose is to provide an autoclutch for a vehicle that prevents the vehicle speed from decreasing too much at the end of the shift when shifting up on a slope, etc., resulting in a lack of engine torque. be.

[Structure of the idea]

The autoclutch according to the present invention includes a shift change determining means that determines whether or not to change gears based on a detection signal from the driving state detecting means, and a shift change determining means that outputs a signal to perform a shift change based on an output signal of the shift change determining means. When changing gears, before the clutch is engaged, the clutch is controlled to a half-clutch state when the vehicle speed is below a certain value, and after a certain period of time, when the vehicle speed is above a certain value, the clutch is connected, and when the vehicle speed is below a certain value, a signal is output to downshift. The present invention includes a shift change control means and a clutch disconnection control means for outputting an actuation signal to a clutch disconnection device based on an output signal of the shift change control means.

[Function and effect of the idea]

Therefore, if the vehicle speed drops too much on a slope or the like, the half-clutch control prevents the clutch from being engaged at a low rotational speed close to the idle rotation, and allows the vehicle speed to be quickly restored. As a result, a feeling similar to that of a manual transmission can be obtained.

[Preferred embodiment]

When implementing the present invention, the operating state detecting means is composed of an engine speed detecting device, a main shaft rotation speed detecting device, and an accelerator opening detecting device, and the shift change determining means, shift change control means, and clutch intermittent control means are controlled respectively. Preferably, the shift change determination circuit, shift change control circuit, and clutch engagement control circuit are provided in the unit.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an overview of the diesel engine equipped with an autoclutch implemented by the present invention, and the second
The control section is shown in the figure. A mechanical automatic transmission 30 is connected to a diesel engine 10 equipped with a fuel injection pump 11 via a mechanical disc clutch 20, and the transmission 30 is connected to a main shaft 31 and a countershaft (not shown), as is well known. ), and the main shaft 30 is connected to a rear axle (not shown) via a propeller shaft. The engine 10 has an engine speed detection device 12 that detects the engine speed, the fuel injection pump 11 has a governor 13 that controls the fuel injection amount, and a governor control device 14 that controls the governor 13 (FIG. 2). is provided. The governor control device 14 controls a fuel control lever and a speed control lever (not shown), thereby causing the governor 13 to function as an all-speed governor or a limit-speed governor.

The clutch 20 is provided with a clutch position detection device, ie, a clutch stroke sensor 21, which detects the engagement/disengagement position of the clutch, and a clutch disconnection device, ie, a clutch booster 22 (FIG. 2), which detects the engagement/disengagement position of the clutch. It is composed of

The transmission 30 includes a main shaft 3 that serves as an output shaft.
1, a main shaft rotation speed detection device 32 that detects the vehicle speed according to the rotation speed of the main shaft, a countershaft rotation speed detection device 33 that detects the rotation speed of the countershaft, a shift gear position detection device 34 that detects the shift position of the gear, and a shift gear position detection device 34 that detects the shift position of the gear. A shift gear set control device 35 for setting the desired gear is provided.

The accelerator pedal 40 is provided with an accelerator opening detection device 41 that detects engine load based on the pedal opening. The selector device 50 has a manually operated selector lever 51, and a range designation signal from an electric contact 52 that is turned on and off by the selector lever 51 is input to a control unit 60.

In FIG. 2, the control unit 60 detects an engine rotation speed signal detected by an engine speed detection device 12, which is a driving state detection means, a vehicle speed signal detected by a main shaft rotation speed detection device 32, and an accelerator opening detection device 41. a shift change determination circuit 61 that determines whether or not a shift change is to be performed according to a previously stored shift map shown in FIG. 5, based on an accelerator opening signal and a drive range designation signal designated by the selector device 50;
Based on the determination signal of the shift change determination circuit 61 and the shift position signal detected by the shift gear position detection device 34, a signal to perform a shift change is output, and the clutch is activated when the vehicle speed is below a certain value before the clutch is engaged during gear shifting. This is a shift change control means that performs half-clutch control on the clutch 20, connects the clutch 20 when the vehicle speed is above a certain value after a certain period of time has elapsed, and controls the clutch 20 to shift down when the vehicle speed is below the certain value. a shift change control circuit 62; and a clutch discontinuation control circuit 6, which is a clutch discontinuation control means that outputs an operating signal to the clutch booster 22 based on the output signal of the shift change control circuit 62.
4, an engine control circuit 63 and a transmission control circuit 65, which will be described later.

The engine control circuit 63 sends a governor control command signal to the governor control device 14 based on the output signal of the shift change control circuit 62 and the engine rotation speed signal detected by the engine speed detection device 12, and controls the governor 13 to operate as a limit speed governor during gear shifting. The control of the fuel injection pump 11 is switched from the control of the fuel injection pump 11 by the all-speed governor to the control of the fuel injection pump 11 by the all-speed governor, and the engine rotation speed is controlled so that gear shifting can be performed optimally.

The transmission control circuit 65 receives the output signal of the shift change control circuit 62, the vehicle speed signal detected by the main shaft rotation speed detection device 32, the countershaft rotation speed signal detected by the countershaft rotation speed detection device 33, and the shift gear position detection device 3.
Based on the shift position signal detected in step 4, a shift gear set command signal is sent to the shift gear set control device 35 to shift the gear.

Next, the operation will be explained mainly with reference to FIGS. 3 and 4. In FIG. 4, vehicle speeds and engine rotational speeds corresponding to FIG. 8 are given the same reference numerals, and redundant explanation will be omitted.

The main shaft rotational speed detection device 32 detects the vehicle speed, and the accelerator opening detection device 41 detects the accelerator opening (step S10). Then, based on these detection signals, the shift change judgment circuit 61 determines the optimum shift from the stored shift map. The stage is determined and a control signal is output to the shift change control circuit 62.
Then, the shift change control circuit 62 compares the detection signal with the detection signal of the shift gear position detection device 34 and determines whether an upshift is necessary (step S11). When a shift up is required, the shift change control circuit 62 outputs an actuation signal to the clutch disengagement control circuit 64 to output the inlet and outlet valves 24 and 25, and opens the inlet valve 24 to turn off the clutch 20 while keeping the outlet valve 25 closed. (Step S1
2) causing the transmission control circuit 65 to output an activation signal to the shift gear set control device 35;
Shift up to the determined gear (step S)
13). Here, the shift change control circuit 62 determines, based on the vehicle speed signal from the main shaft rotational speed detection device 32, whether the vehicle speed has fallen below a constant vehicle speed Vc that should permit engagement of the clutch at the time of shift-up (step S14). If the clutch is not lowered, the clutch engagement control circuit 64 outputs an actuation signal to the inlet and outlet valves 24 and 25, opens the outlet valve while keeping the inlet valve 24 closed, and turns on the clutch 20 (step S18).
If the vehicle speed has decreased to Ca below the constant value Vc (YES in step S14), the engine speed will decrease to the speed Da and near the idling speed during shift-up as the vehicle speed decreases (however, if the On the other hand, the shift change control circuit 62 receives an operating signal from the engine control circuit 65 and transmits the operating signal to the governor control device 1.
4, the engine rotation speed E at maximum torque
(step S15). Next, the shift change control circuit 62 is connected to the clutch engagement control circuit 6.
2, an actuation signal is output to the inlet and outlet valves 24 and 25 to hold the clutch 20 in the half-clutch state for a certain period of time, for example, 2 to 3 seconds, and the inlet valve 24 is kept closed and the outlet valve 25 is output.
is repeatedly opened for a minimum period of time to start the half-clutch state of the clutch 20 (step S16). Then, after a certain period of time, the shift change control circuit 62 determines whether the vehicle speed has recovered to the constant value Vc based on the vehicle speed signal from the main shaft rotation speed detection device 32 (step S17), and if it has reached the constant value Vc, the clutch is engaged. The control circuit 64 outputs an actuation signal to the inlet and outlet valves 24 and 25, and the inlet valve 24 is closed and the outlet valve 25 is opened to close the clutch 20.
is turned ON (step S18), and if the constant value Vc has not been reached, the transmission control circuit 6
5, an operating signal is output to the shift gear setting device 35 to perform a downshift (step S19).
At this time, the clutch is disconnected.

In this way, when the vehicle speed decreases significantly at the time of upshifting, half-clutch control is performed at the engine rotational speed F at the maximum torque, so that the vehicle speed can be recovered more quickly.

〔summary〕

As explained above, according to the present invention, during gear shifting, when the vehicle speed is below a certain value, half-clutch control is performed, and after a certain period of time, when the vehicle speed is above a certain value, the clutch is engaged, so that the vehicle speed can be quickly recovered. can do. As a result, a feeling similar to that of a manual transmission can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an automobile diesel engine equipped with an autoclutch in which the present invention is implemented;
Figure 3 is a block diagram of the control unit, Figure 3 is a flowchart showing the control mode of the control unit, Figure 4 is a diagram of the control pattern during shift up, Figure 5 is a diagram of the control pattern at the time of shift up.
Figure 6 is a diagram of the shift map used in this invention.
The figure is a detailed view of the clutch booster used in the present invention, FIG. 7 is a flowchart showing the control mode of the control unit of the conventional device, and FIG. 8 is the control pattern during upshift of the conventional device. 12... Engine speed detection device, 20... Clutch, 21... Stroke sensor, 22... Clutch booster, 32... Main shaft rotation speed detection device, 41... Accelerator opening detection device, 60
...Control unit, 61...Shift change determination circuit, 62...Shift change control circuit, 64...
...Clutch intermittent control circuit.

Claims (1)

[Scope of utility model registration request] A shift change determining means for determining whether or not to shift based on a detection signal from the driving state detecting means; and a shift change determining means for outputting a signal to change the shift based on the output signal of the shift change determining means, and a shift change determining means for determining whether or not to shift based on a detection signal from the driving state detecting means; a shift change control means for outputting a signal to half-clutch the clutch when the vehicle speed is below a certain value, connect the clutch when the vehicle speed is above the certain value after a certain period of time has elapsed, and shift down when the vehicle speed is below the certain value; 1. An autoclutch for a vehicle, comprising a clutch disengagement control means for outputting an operating signal to a clutch disengagement device based on an output signal of the change control means.