JPH02168028A - Method and device for clutch control - Google Patents

Abstract

PURPOSE:To control a clutch smoothly and precisely and shorten dead time for torque transmission by outputting electric signals with time variation characteristics of target stroke for engaging a clutch in response to command for engaging clutch, and controlling the stroke of the clutch according to the signals. CONSTITUTION:A basic data generator 6 outputs electric signals with time variation characteristics of target stroke for engaging a clutch 2, in response to command signal CM for engaging clutch. A proper target stroke pattern data BD in response to the clutch engagement command from a transmission control unit 7 and according to the present gear position is output from the basic data generator 6, and corrected in a correction calculator 8 according to the present amount of accelerator control. Variation of the pattern of variation in the amount of stroke or the clutch 2 is determined by offset of the amount of control of an accelerator pedal 9. Therefore, the larger the amount of control of the accelerator pedal 9 becomes, the smaller the target stroke value at the beginning point of the engagement of the clutch 2 becomes, and a time required for completed engagement of the clutch 2 is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clutch control method and device, and more specifically, to a clutch control method and device that can smoothly control clutch engagement.

(Prior Art) In conventional clutch control devices such as those used in automatic transmissions, when the clutch is connected, the clutch is engaged at a speed that corresponds to the engine speed, thereby ensuring smooth latch connection. Controls that can be achieved are known. However, this control has a problem in that the shift time becomes longer, especially when trying to reduce the shock caused by clutch engagement when starting the vehicle. In order to solve this problem, for example, Japanese Patent Application Laid-Open No. 11766/1983 makes a distinction between a start mode and a shift mode.
In shift mode, the clutch engagement speed is controlled according to the amount of accelerator pedal depression, which solves the conventional problem of requiring a longer shift time overall when a smooth start is desired. A clutch control device is disclosed.

(Problems to be Solved by the Invention) This conventional device is configured to change the clutch engagement operation speed according to the amount of accelerator operation, so it is possible to change the time required for clutch engagement depending on the amount of accelerator operation. can.

However, if the above-mentioned speed control is adopted when the clutch is connected, if the clutch operation is to be finely adjusted within the half-way two-way zone, speed data must be calculated for each clutch position, and the connection control data processing tends to be complicated.

In addition, when the clutch is operated at a relatively high speed in I#, it is necessary to accurately stop the clutch at the desired position due to variations caused by the time delay in detecting the clutch position. The problem is that it is difficult to

Furthermore, when attempting to operate the clutch at a speed corresponding to the amount of accelerator operation in order to engage the clutch as described above, after the operation to engage the clutch is started, a certain degree of Another problem is that it is impossible to eliminate dead time until torque transmission starts.

The state in which the transmission torque is off due to the above-mentioned dead time causes a feeling of discomfort between the driving operation feeling and the acceleration feeling of the vehicle, especially when the accelerator is strongly depressed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved clutch control method and device that makes it possible to solve the above-mentioned problems in the prior art.

(Means for Solving the Problems) A feature of the present invention for solving the above problems is that, in a clutch control method for controlling the engagement operation of a friction type clutch, the clutch is operated in response to a command for clutch engagement. The present invention is characterized in that an electrical signal indicating the temporal change characteristic of a target stroke for a connecting operation is outputted, and the stroke of the clutch is controlled in accordance with the signal.

Another feature of the invention is a clutch control device for controlling the engagement operation of a friction type clutch connected to an internal combustion engine, which responds to a command for clutch engagement and determines a target stroke for the engagement operation of the clutch. an output means for outputting an electrical signal indicating a temporal change characteristic of the internal combustion engine; a first detection means for detecting the operation amount of an accelerator operation member connected to the internal combustion engine; and a correction means for correcting the signal so that at least the initial target stroke value in the change characteristic is changed according to the operating amount of the member, and the clutch is adjusted according to the signal corrected by the correction means. The point is that stroke control is performed.

(Operation) According to the method of the present invention, in response to a command for clutch engagement, an electrical signal indicating the temporal change characteristic of a target stroke for a clutch engagement operation is output. This electrical signal has information on the target stroke value of the clutch at each time after the clutch connection command, and the actual stroke value of the clutch is controlled according to this information. As a result, the clutch is controlled smoothly and with high precision according to the above characteristics.

Further, according to the device of the present invention, the electrical signal indicating the temporal change characteristics of the target stroke output by the clutch engagement command is inputted to the correction means, so that at least the initial target stroke value is determined by the amount of accelerator operation at that time. 7, and the actual stroke value of the clutch is controlled by a signal indicating this changed characteristic. As a result, the target stroke value immediately after the start of clutch engagement changes depending on the accelerator operation amount, and the dead time of torque transmission by the clutch is shortened in accordance with the accelerator operation amount.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a clutch control device according to the present invention. The clutch control device 1 according to the present invention is a device for controlling the connection/disengagement of a friction type clutch 2, and is a device for controlling the connection/disengagement of a friction type clutch 2, and is a device for controlling the engagement/disengagement of a friction type clutch 2. An actuator 4 that operates in response to a control signal C from a control circuit 3 is connected to the lever 2b. In this embodiment, the control circuit 3 and the actuator 4 control the connection/connection of the clutch 2 in response to a signal input to the control circuit 3 as described later.
It constitutes a control section 5 that adjusts the stroke for separation.

Reference numeral 6 denotes a basic data generation unit for outputting an electrical signal indicating the temporal change characteristics of a target stroke for the engagement operation of the clutch 2 in response to the clutch engagement command signal CM. In the illustrated embodiment, the basic target stroke value is a set of data indicating the basic target stroke value of the clutch 2 at each time from the start of engagement of the clutch 2 to the complete engagement of the clutch 2.
Generate Zaturn data BD. Here, the clutch connection command signal CM is output from the speed change control unit 7 that performs speed change control of a gear type transmission (not shown) at the end of a gear shift operation.

The basic data generating unit 6 includes first basic data D for connecting the clutch 2 when the gear of the transmission enters the first speed position.
, a second generator 62 that generates second basic data D2 for connecting the clutch 2 when the gear of the transmission enters the second gear position, and other gear positions. It has a third generating section 63 that generates third basic data for connecting the clutch 2 when the clutch 2 is engaged.

In response to the application of the clutch connection command signal CM, from the first generation unit 61 to the third generation unit 63, as shown in FIG. The target clutch stroke amount St
The first to third basic data D to D3, which change according to four predetermined turns, are output. In FIG. 2, each data D + + D2 r Ds when 1=0
Target clutch stroke value S indicated by . is the first
This is a value that brings about a state as shown in FIG. 1, in which the brake shear plate 2a shown in the figure is completely separated from the clutch plate 2c. The state of 5t=0 indicates a state in which the clutch 2 is completely connected, and corresponds to the case where the conventional clutch wheel is completely opened. Sa≦St≦s
In the range b, the clutch 2 is in a half-clutch state.

The above-mentioned first basic data D1 to third basic data D3 are input to the data selection section 64, which is supplied with an actual gear position signal GA from the shift control unit 7, which indicates the gear position actually shifted.

The data selection unit 64 selects one of the first to third basic data according to the content of the actual gear position signal GA, and the selected basic data is used as the basic target stroke pattern data BD by the basic data generation unit. 6 and input to the correction calculation section 8.

In the illustrated embodiment, the correction calculation unit 8 performs a correction calculation to give an offset corresponding to the amount of operation of the accelerator pedal 9 at that time to the basic target stroke pattern data BD obtained as described above.

This offset amount is based on an accelerator signal A that is output from an accelerator sensor 10 that detects the operating amount of an accelerator pedal 9 connected to an internal combustion engine (not shown) that is connected to the clutch 2, and indicates the accelerator operating amount at that time. It is calculated by the offset amount calculation section 11. The offset amount calculation here is based on the characteristic diagram shown in FIG. 3, and determines the offset amount K of the stroke of the clutch 2 based on the accelerator operation amount indicated by the accelerator signal person at that time. Offset data OD indicating the determined offset amount K is input to the correction calculation section 8.

The correction calculation unit 8 subtracts the offset amount K indicated by the offset data OD from each data value of the basic target stroke pattern data BD, and the target stroke pattern data SD consisting of the data obtained as a result is sent to the control circuit 3. Given.

Therefore, for example, when the third basic data D3 is selected as the basic target stroke/data BD and the offset amount K is the value Km, the target stroke t4 turn data SD given to the control circuit 3 is: This is shown by the dotted line in FIG.

An actual stroke value signal 8A indicating an actual stroke value of the clutch 2 is input to the control circuit 3 from a stroke sensor 12 connected to the release lever 2b. This actual stroke value signal SA is compared with target stroke pattern data SD in control circuit 3, and an error between the actual stroke value of clutch 2 and the current target stroke value indicated by target stroke pattern data SD is detected. The pulse signal whose duty ratio is controlled based on the error obtained in this way is transmitted to the actuator 4.
The control circuit 3 outputs the drive control signal C as a drive control signal C for driving the drive control signal C, and applies it to the actuator 4. This results in
The position of the release lever 2b is controlled in a closed loop so that the actual stroke value of the clutch 2 matches the target stroke value at that time.

The control circuit 3 further includes a clutch off signal CO for instructing disengagement of the clutch 2, which is sent to the speed change control unit 7.
In response to the application of the clutch off signal CO, the control circuit 3 controls the actuator 4 so that the release lever 3 is operated at a predetermined speed to disengage the clutch 2.
This is a configuration that controls the

According to such a configuration, in response to a clutch engagement command from the speed change control unit 7, the basic target stroke pattern data BD appropriate for the gear position at that time is outputted from the basic data generating section 6.

Furthermore, the offset amount calculation section 11 determines the value of the offset amount according to the accelerator operation amount at this time based on the predetermined characteristics shown in FIG. The amount of offset indicated by OD is corrected.

As a result, in accordance with the amount of operation of the accelerator pedal 9, the change in the stroke amount of the clutch 2 when the clutch 2 is connected changes. This change of /4 turns is the rounding due to the offset of the target stroke value, the initial stroke value, that is, the target stroke value S at the starting point of the clutch 2 engagement operation.

However, the larger the amount of operation of the accelerator pedal 9, the smaller it becomes.
Moreover, the time required for the clutch 2 to reach the fully connected state is shortened.

Therefore, when the accelerator pedal 9 is depressed greatly, the dead time of torque transmission in the clutch 2 is shortened, and the time required for the clutch 2 to become fully connected is also shortened, and the vehicle can be smoothly accelerated. The operating feel and the acceleration feeling of the vehicle match well, and no discomfort is caused.

Further, since the connection of the clutch 2 is executed by clutch stroke control based on the basic target stroke/IF turn data BD output from the basic data generating section 6, high control accuracy can be obtained. In other words, the relationship between the clutch stroke value and the clutch transmission force is not linear, and it is difficult to control the clutch transmission force even if the clutch speed is controlled. Since the stroke value of the clutch is controlled based on the relationship between Therefore, without excessive slippage of the clutch 2 or mechanical locking,
Smooth latch connection control can be performed.

In the above embodiment, the basic data generator 6 outputs data from the first to third generators under predetermined conditions, and outputs one of them according to the content of the actual gear position signal GA. However, the configuration of the present invention is not limited to this embodiment. For example, only one of the generators can be activated according to the content of the actual gear position signal GA, and the configuration of the present invention is not limited to this embodiment. It can be configured to obtain the required basic target stroke pattern/data.

Furthermore, in the above embodiment, a predetermined offset amount is determined by the accelerator operation amount, and the selected basic target stroke pattern data BD is moved in parallel along the vertical axis in the characteristic diagram of FIG. 2 by this offset amount. Although the case where the correction is performed is shown, an arrangement may be made in which the offset coefficient is obtained from the accelerator operation amount and the required basic target stroke data BD is multiplied by this offset coefficient to perform the required correction.

FIG. 4 shows another embodiment of the clutch control device according to the invention. The clutch control device 20 in FIG.
Target stroke/! The turn data SD is generated by a microcomputer 30,
In FIG. 4, parts corresponding to those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

The microcomputer 30 is a central processing unit (CPU)
31, of a known hardware configuration having a read only memory (ROM) 32 and a random access memory (RAM) 33, and an accelerator signal.

In response to the clutch connection command signal CM and the actual gear position signal GA, target stroke pattern/data SD is generated as shown below.

FIG. 5 is a flowchart showing a program executed in microcomputer 30 to generate target stroke nose turn data SD. To explain this flowchart, this program is executed every fixed period of time (for example, 8 (ms・C)), and Stella 7'
In step 41, the accelerator opening indicated by the accelerator signal person is read, and in step 42, a time reduction rate α corresponding to the accelerator opening value read in step 41 is determined.

In the ROM 32, only one set of basic data corresponding to the characteristics shown in FIG. 2 is stored in advance, and the above-mentioned time reduction rate α is used as a coefficient for shortening the time axis of the basic data. Ru.

FIG. 6 shows a characteristic curve showing the relationship between the one-hour reduction rate α and the accelerator opening.

In step 43, an increment counter value corresponding to the offset amount explained based on FIG. 1 is determined according to the characteristics shown in FIG. This increasing counter value is ROM 3
This is a count value for correcting the count value of a counter that outputs address data for reading basic data stored in step 2, and as shown in FIG. 7, the time reduction rate α determined in step 42. determined according to

In step 44, the old counter value set in the counter is corrected based on the increment counter value determined in Stella 7° 43, and the sum of the old counter value and the increment counter value is added to the counter as the new counter value. is set to Next, the process proceeds to step 45, where the target clutch stroke value Q is determined from the value set in the counter. This determination is made by replacing the horizontal axis with a counter value in the characteristic diagram shown in FIG. 2, and reading target stroke data from the ROM 32 according to the counter value at that time.

In step 46, the stroke increase value β corresponding to the accelerator opening at that time is determined based on characteristic data showing the relationship between the accelerator opening and the clutch stroke increase value β shown in FIG.

In step 47, the increase value β is added to the target clutch stroke value Q determined in step 45 to determine the target clutch stroke value QC at that time. At Stella 7'48, the target clutch stroke straight QC is output as target data.

The above calculation is executed at predetermined time intervals, and a target clutch stroke value QC is output each time it is executed, and a series of data thus output is input to the control circuit 3 as target stroke/turn data SD. , clutch 2
The stroke of the clutch 2 is controlled in a closed loop according to a modified pattern according to the accelerator operation l, and the clutch 2 is smoothly operated.
Moreover, the connection is controlled with precision.

In the case of the embodiment shown in Fig. 4, the off-seratra or kerno is set in the basic data by the clutch increase value β as in the embodiment shown in Fig. 1, but the value of the counter is corrected by the time reduction rate α. In this way, the connection speed of the clutch 2 is also changed in accordance with the amount of operation of the accelerator. Therefore, the connection of the clutch 2 can be made to match the operating feeling of the accelerator very well, and good matching with the acceleration feeling of the vehicle can be maintained.

Note that it is also possible to configure the control program so that part or all of the functions of the control circuit 3 shown in FIG. 4 are performed in the micro combinator 30, and the control circuit 30 can be omitted.

(Effects of the Invention) According to the present invention, as described above, the stroke change gloss turn for clutch engagement is controlled in accordance with the signal indicating the temporal change characteristics of the target stroke for clutch engagement operation, and thereby the clutch engagement Since the connection control is performed, it is possible to effectively control the transmission of torque applied to the clutch, and the clutch connection control can be performed accurately and smoothly.

Further, according to the present invention, since the dead time of torque transmission when the clutch is engaged is shortened according to the accelerator operation amount, there is a difference between the accelerator operation feeling when the clutch is engaged and the acceleration feeling of the vehicle. This has the effect of providing an extremely comfortable driving feeling without causing any discomfort.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a characteristic diagram of data output from the basic data generation section of Fig. 1, and Fig. 3 is calculated by the offset amount calculation section of Fig. 1. FIG. 4 is a block diagram showing another embodiment of the present invention, and FIG. 5 shows a program executed by the microcomputer shown in FIG. 4. The flowcharts of FIGS. 6 to 8 are graphs showing characteristic curves used in each calculation according to the flowchart shown in FIG. 1.20...Clutch control device, 2...Clutch,
5... Control section, 6... Basic data generation section, 8...
Correction needle 3HfflS, 10...Accelerator Senna, 11
...Offsect amount calculation unit, CM...Clutch connection command No. 18, BD...Basic target stroke pattern data, OD...Offset data, SD...Target stroke pattern data. Figure 5 Figure 6 Patent applicant Diesel Equipment Co., Ltd.

Claims (2)

[Claims] 1. A clutch control method for controlling the engagement operation of a friction clutch, which outputs an electrical signal indicating temporal change characteristics of a target stroke for the clutch engagement operation in response to a command for clutch engagement; A clutch control method characterized in that the stroke of the clutch is controlled in accordance with a signal. 2. In a clutch control device for controlling the engagement operation of a friction type clutch connected to an internal combustion engine, an electric signal responsive to a command for clutch engagement and indicating temporal change characteristics of a target stroke for the engagement operation of the clutch. a first detection means for detecting an operation amount of an accelerator operation member connected to the internal combustion engine; and a first detection means for detecting an operation amount of an accelerator operation member connected to the internal combustion engine; A clutch control device comprising: a correction means for correcting the signal so that an initial target stroke value in a change characteristic is changed, and stroke control of the clutch is performed in accordance with a signal corrected by the correction means. .