JP2002295527A - Control device of mechanical type transmission gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a transmission gear with which optimal gear stage is selected and acceleration is performed without making it possible to sense shock and sluggish feeling in case of decelerating from running condition to just before stop and accelerating again. SOLUTION: The control device 10 includes an extremely low velocity optimal gear stage selected means 20 detecting that the transmission gear 3 is in a range of predefined vehicle velocity of the extremely low velocity after it detects to be controlled to neutral position by means of deceleration in the vehicle and that open extent of an accelerator is more than the predefined value and selecting the optimal gear stage to the vehicle velocity, and further includes an automatic clutch starting drive controlled means 30 detecting that the opening extent of the accelerator is more than the predefined value and which performs a clutch rapidly connected control and which performs a clutch slowly connected control after travel of the clutch is less than the predefined value and which performs a clutch perfectly connected control after it detects agreement between rotation frequency of an engine and a counter shaft and it is configured to shift to control of the automatic clutch starting drive controlled means 30 after control due to the extremely low optimal gear selected means 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch for selecting an optimum gear position corresponding to a vehicle speed based on each detection signal of a vehicle speed detecting means, an accelerator opening detecting means, and a gear position detecting means and performing a shift control. The present invention relates to a control device for a mechanical transmission having the same, and more particularly to an improvement in control when the vehicle starts moving.

[0002]

2. Description of the Related Art The applicant of the present invention has disclosed a gear shift control device for a mechanical semi-automatic transmission (semi-automatic transmission) for a commercial vehicle, which automatically performs gear shift control by electronic control. Discloses the technology. In this technique, as shown in FIG. 8, a clutch pedal 6 is provided, and a control device 10A electronically controls a mechanical clutch 2 and a shift device 4 based on a signal from a shift tower 7, and a mechanical transmission 3 The shift operation is controlled by detecting that the clutch pedal 6 is depressed. However, in such a technique, the clutch operation at the time of starting is not automated.

[0003] With regard to the automation of the clutch operation at the time of starting, there must be no shock or rattling at the time of starting, and control can be performed according to the driver's feeling even in various driving states. For example, even when the vehicle is decelerating from a running state and is about to stop (the transmission is in neutral) and suddenly tries to accelerate, the optimal gear position is selected by operating the accelerator pedal 5 and acceleration is performed smoothly. Needs to be done. However, such a technique has not been proposed at present.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art.
When decelerating from the running state to just before stopping and re-acceleration,
It is an object of the present invention to provide a control device for a transmission in which an optimal gear is selected and acceleration is performed without causing a feeling of shock or backlash.

[0005]

A control device for a mechanical transmission according to the present invention comprises an optimum gear position corresponding to a vehicle speed based on detection signals of a vehicle speed detection device, an accelerator opening detection device, and a gear position detection device. A control device for a mechanical transmission having a clutch for performing speed change control by selecting the speed control device, the control device detects that the transmission has been neutrally controlled by deceleration of the vehicle, and thereafter, within a predetermined vehicle speed range of extremely low speed. An extremely low speed optimum gear position selecting means for detecting the presence of the vehicle and the accelerator opening being equal to or more than a predetermined value and selecting an optimum gear position for the vehicle speed is provided. In practicing the invention, in addition to the above, in addition to the above, it is detected that the axle opening is equal to or more than a predetermined value, and the clutch quick connection control is performed, and when the clutch stroke becomes equal to or less than the predetermined value, the clutch loose connection control is performed. Automatic clutch start control means for detecting a match between the rotation speed and the counter shaft rotation speed to perform clutch complete connection control, and after the control by the extremely low speed optimum gear selection means, control of the automatic clutch start control means It is preferable to be configured to shift to (claim 2).

Here, the neutral detection at the time of vehicle deceleration by the extremely low speed optimum gear position selecting means is detected by the gear position detecting means, and the vehicle speed range at the extremely low speed is detected by the vehicle speed detecting means. Preferably, the degree is detected by an accelerator opening degree detecting means.

[0007] The extremely low predetermined vehicle speed range is as follows.
Not stopped but moving at a slow speed, for example, 2
It is preferable to judge that the vehicle is stopped when the vehicle speed is 2 km / h or less.

In the automatic clutch start control means, an engine speed sensor for detecting the engine speed and a clutch stroke sensor for detecting the clutch stroke are provided to perform the clutch loose connection control. It is preferable that a gear speed sensor for detecting the speed is provided to detect the coincidence between the engine speed and the counter shaft speed.

In the clutch loose connection control, the engine speed is detected, the engine speed is differentiated, and the engine speed is calculated. If the engine speed is high and the engine speed is high, It is preferable to perform fast clutch engagement control, and if the engine speed is low or the engine rotational acceleration is small (or negative), it is preferable to perform slow clutch engagement control or control to temporarily hold the clutch.

According to the present invention having such a configuration, even when the vehicle is decelerated to an extremely low speed and the transmission gear is in a neutral state, the optimal gear for the extremely low speed can be obtained by stepping on the accelerator. Since the selection is made and the process shifts to the automatic clutch start control, there is no shock or rattling, and smooth re-acceleration is realized according to the driver's feeling. In the automatic clutch start control, first, the quick connection control is performed up to a predetermined value of the clutch stroke, and then the control is shifted to the gentle connection control without feeling a shock or a rattling, and the complete connection is performed with the engine speed and the counter shaft rotation. Control is terminated when the numbers match.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an extremely low speed optimum gear position selecting means 20 of a transmission control device 10 according to the present invention. An optimal gear position map 10a for instructing an optimal gear position according to the vehicle speed is built in, a vehicle speed detecting means 11 for detecting a traveling vehicle speed, an accelerator opening sensor for detecting an accelerator opening (accelerator opening detecting means). 12,
And gear position detecting means 1 for detecting a gear position of a transmission
4 are connected, and the detection signals are respectively input. The shift control means 4 is connected, and shift control is performed based on input signals of these detection means.

Next, the mode of the control operation by the extremely low speed optimum gear position selecting means 20 will be described with reference to FIG. First, in step S1, the gear position detection means 14 detects whether the vehicle has decelerated and the transmission 3 has reached the neutral position.
If it is o, the process proceeds to step S2 if it is Yes.

In step S2, it is determined whether the detected value of the vehicle speed detecting means 11 is within a predetermined range. That is, for example, when the vehicle speed is 5 km / h or more, the process returns to step S1. If it is in the range of 5 to 2 km / h, the process proceeds to step S3.

In step S3, the accelerator opening sensor 1
It is determined whether the detected value of No. 2 is equal to or greater than a predetermined value (that is, whether or not the vehicle is re-accelerated from the deceleration state). If No, the process returns to Step S2. Then, the optimum gear position for the vehicle speed is selected, and the process proceeds to automatic clutch start control (FIG. 4).

The configuration of the automatic clutch start control means 30 is shown in a block diagram in FIG. The automatic clutch start control means 30 includes an engine speed sensor 16, a clutch stroke sensor 13, a gear speed sensor 17,
And the accelerator opening sensor 12 are connected to each other, and their respective detection signals are input, and the control signal is output by being connected to the clutch actuator 8 that operates the clutch.

The engine speed sensor 16 is connected to the engine speed calculation unit 30c of the start control means 30, and is further connected to the engine speed acceleration calculation unit 30d from the engine speed calculation unit 30c. Further, the clutch stroke sensor 13 is a clutch stroke calculation unit 3
0f, the gear speed sensor 17 is connected to the gear speed calculating unit 30g, and the axle opening sensor 12 is connected to the axle opening calculating unit 30e.

The engine speed calculation unit 3
0c, the engine rotational acceleration calculating unit 30d, the clutch stroke calculating unit 30f, the gear rotational speed calculating unit 30d, and the axle opening calculating unit 30e are connected to the clutch connection determining unit 30a, respectively.
Is connected to the clutch actuator 8 via the.

FIG. 5 shows a configuration 30A in the case of clutch loose connection control described later. in this case,
The automatic clutch start control means 30 (FIG. 3) is configured without using some components. That is, the input from the engine rotation sensor 16 is output from the engine rotation calculation unit 30c.
, And further connected to an engine rotation acceleration calculation unit 30d. The engine rotation calculation section 30c and the engine rotation acceleration calculation section 30d are connected to the clutch connection determination section 30a and output to the clutch actuator via the clutch control section 30b.

The control operation of the automatic clutch start control means 30 will be described below with reference to the flowcharts of FIGS. In FIG. 4, first, in step S11, it is determined from the detection value of the accelerator opening sensor 12 whether or not the accelerator opening is equal to or more than a predetermined value, and it is determined whether or not the vehicle has started. N
If it is o, it is the same, if it is Yes, the step S
Proceed to 12. In step S12, quick connection control of the clutch 2 is performed, and it is detected by the clutch stroke sensor 13 whether the clutch stroke has become equal to or less than a predetermined value (step S13). Move on.

FIG. 6 shows the flow of the clutch loose connection control. First, in step S21, the engine speed is input from the engine speed sensor 16 to the engine speed calculation unit 30c, and the engine acceleration is calculated by the engine speed acceleration calculation unit 30d.

Then, in step S22, "the engine speed is low and the engine rotational acceleration is small or negative"
Is determined, and if Yes, step S1 in FIG.
Return to 5. In this case, the clutch 2 is temporarily held. N
If it is o, the process proceeds to step S23, and it is determined whether "the engine rotation speed is high and the engine rotation acceleration is low" or "the engine rotation speed is low and the engine rotation acceleration is high". If Yes, the process proceeds to step S24, and the clutch 2 is slowly connected or the connection amount is reduced. Then, the process returns from the loose connection control to step S15 in FIG. If No, that is, "increase engine speed,
And if the engine rotational acceleration is large ", the process proceeds to step S25.
Then, the process returns to step S15 in FIG. 4 from the loose connection control as the clutch is connected faster or the connection amount is slightly larger.

Returning to FIG. 4, when the clutch loose connection control proceeds, the engine speed and the countershaft speed match from the values detected by the engine speed sensor 16 and the gear speed sensor 17. (Step S15), if No, the clutch loose connection control of Step S14 is continued, and if Yes, Step S16
To complete the clutch complete connection control, and terminate the automatic start control.

FIG. 7 shows the flow of another embodiment of the clutch loose connection control (step S14 in FIG. 4). In this embodiment, the clutch actuator 8 for operating the clutch 2 is operated by fluid pressure, and the clutch 2 is operated by opening and closing a small exhaust magnetic valve (not shown).

In FIG. 7, first, when the engine speed is read and the engine speed is calculated (step S21), in step S31, the clutch loose connection coefficient K1 corresponding to the engine speed is read from the map 1. It is. Next, in step S32, the clutch loose connection correction coefficient K2 corresponding to the engine rotational acceleration is read from the map 2. Further, in step S33, the clutch loose connection determination coefficient K is calculated as the product of the coefficient K1 and the correction coefficient K2.

Then, in step S34, the clutch loose connection determination coefficient K is compared with a constant A1 for determining whether to temporarily hold the clutch. If "K <A1" is Yes, the flow returns to step S15 ( In this case, the clutch is once held.) If No, the process proceeds to step S35.

In step S35, the clutch loose connection determination coefficient K is compared with a constant A2 (or a constant that determines the connection speed or the connection amount and the degree of increasing the oil pressure) that determines the opening and closing time of the small exhaust magnetic valve. , "K <A
If "2" is Yes, the process proceeds to step S36 to open the small exhaust magnetic valve for a short time. As a result, the clutch is slowly connected or the connection amount is small. In the case of the hydraulic control system, the pressure is slightly increased. If “K <A2” is No, the process proceeds to step S37, and the small exhaust magnetic valve is opened for a long time. As a result, the connection of the clutch is slightly faster, or the connection amount is slightly larger. In the case of the hydraulic control system, the pressure is increased somewhat. Then, the process returns from the clutch loose connection control to step S15 in FIG.

Therefore, according to the present invention, when the vehicle decelerates to an extremely low speed and the transmission gears become neutral, if the accelerator is depressed, the extremely low speed optimum gear selecting means 20 detects the vehicle speed at that time. The optimal gear position is selected. Then, the process shifts to the automatic clutch start control means 30. First, the quick connection control is performed until the clutch meet point, which is the predetermined value of the clutch stroke, and then the process shifts to the gentle connection control, where the engine speed is high and the engine speed is high. If it is large, fast clutch connection control is performed. If the engine speed is low or the engine rotation acceleration is small (or negative), slow clutch connection control or control for temporarily holding is performed. Done. Then, the clutch connection is detected by detecting the coincidence between the engine speed and the countershaft speed, and the control ends.

[0028]

The present invention is configured as described above and has the following effects. (1) If the vehicle decelerates and re-accelerates at an extremely low speed, for example, decelerates due to a stop signal and the signal changes just before the stop where the gears have become neutral, and the vehicle tries to re-accelerate, depress the accelerator. The optimum gear is selected at that speed, and the process shifts to automatic clutch start control to enable re-acceleration. (2) In the automatic clutch start control, the quick connection control is performed until a predetermined stroke of the clutch, and then the control is shifted to the loose connection control. When the engine speed and the countershaft speed match, the control ends. Acceleration can be performed without feeling shock or rattling.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an extremely low speed optimum gear position selecting means according to the present invention.

FIG. 2 is a flowchart showing a control operation by an extremely low speed optimum gear position selecting means.

FIG. 3 is a block diagram showing a configuration of automatic clutch start control means.

FIG. 4 is a flowchart illustrating a control operation by a clutch connection control unit.

FIG. 5 is a block diagram showing a configuration of a clutch loose connection control unit.

FIG. 6 is a flowchart of an embodiment of clutch loose connection control.

FIG. 7 is a flowchart of another embodiment of the clutch loose connection control.

FIG. 8 is a perspective view showing the overall configuration of a conventional transmission control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Clutch 3 ... Transmission 4 ... Shift device 5 ... Accelerator pedal 6 ... Clutch pedal 7 ... Shift tower 8 ... Clutch actuator 10 ... Control device (control unit) 11: vehicle speed detecting means 12: accelerator opening sensor (accelerator opening detecting means) 13: clutch stroke sensor 14: gear position detecting means 16: engine speed Sensor 17: Gear rotation speed sensor 20: Very low speed optimum gear selection means 30: Automatic clutch start control means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaru Yamashita 1-chome, 1-chome, Ageo-shi, Saitama F-term in Nissan Diesel Industry Co., Ltd. (reference) 3J057 AA03 GA21 GA66 GB02 GB05 GB12 GB26 GB36 HH02 JJ04

Claims (2)

[Claims] A vehicle speed detecting means, an accelerator opening degree detecting means,
And a control device for a mechanical transmission having a clutch for performing a shift control by selecting an optimal gear position corresponding to the vehicle speed based on each detection signal of the gear position detection means, the control device comprising: After detecting that the vehicle is controlled to be neutral, detecting that the vehicle is within a predetermined vehicle speed range of extremely low speed and that the accelerator opening is equal to or more than a predetermined value, and selecting an optimum gear position corresponding to the vehicle speed. A control device for a mechanical transmission, characterized by comprising means. 2. When the axle opening is equal to or greater than a predetermined value, clutch rapid connection control is performed, and when the clutch stroke falls below a predetermined value, clutch loose connection control is performed. Automatic clutch start control means for performing clutch complete connection control by detecting coincidence with the number, and shifting to control of the automatic clutch start control means after control by the extremely low speed optimum gear selecting means. The control device for a mechanical transmission according to claim 1, wherein