JPH0488215A - Clutch control method for clutch type automatic transmission - Google Patents

Abstract

PURPOSE:To prevent engine stall by connecting a clutch half under conditions of constant and increasing operating rates of an accelerating pedal during running until an accelerating rate is a specified negative rate, and by disconnecting the clutch thereafter. CONSTITUTION:In respect to various kinds of sensors for detecting a condition of a vehicle, a signal from a vehicle speed detecting sensor 1 is directly input to a CPU 7, while signals from sensors 2 to 6 such as an accelerator pedal stroke detecting sensor, an accelerating ratio detecting sensor and the like are input thereto through an A/D converter together with a signal from a ROM 9 in which relation between an accelerator pedal operating amount and a throttle opening is memorized. Output from the CPU 7 is directly input to a throttle opening controller 10, and adopted to drive actuators 11, 12 for a clutch and shifting first and second speed gear through a D/A converter 14, an actuator driving circuit 13. Under conditions of a constant and increasing operating rates of the accelerating pedal, the clutch is half connected until the acceleration rate is a specified negative value, and disconnected thereafter. Unexpected engine stop is thus prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a clutch control method for preventing engine stalling in a clutch type automatic transmission when an external load on a vehicle increases. .

[Conventional technology]

With conventional clutch-type automatic transmissions, when the vehicle is driving with the accelerator pedal depressed at a constant level, or even though the amount of accelerator pedal depression is gradually increased, for example, when the vehicle approaches an uphill slope, the vehicle speed decreases. When the speed drops, the transmission gear shifts down and eventually returns to 1st gear.

[Problem to be solved by the invention]

However, when the vehicle speed decreases due to an external load such as when climbing a slope, the engine cannot withstand the load and the vehicle stalls midway through the journey.

The present invention has been developed in consideration of the above, and therefore, when the above-mentioned condition is reached, the clutch is set to a half-clutch state or a clutch stage state to stop the engine before the engine cannot withstand the load and stalls. It is an object of the present invention to provide a clutch control method for a clutch type automatic transmission that can prevent such problems from occurring.

[Failure to solve the problem]

In order to achieve the above object, a clutch control method for a clutch type automatic transmission according to the present invention includes an accelerator pedal stroke detection means, an engine throttle opening detection means, a vehicle acceleration detection means, and a clutch stroke detection means. , a throttle opening control means, a clutch driving means, a storage means that stores the relationship between the accelerator pedal depression amount and the throttle opening, and calculations based on the detection signals from each of the detection means and the data from the storage device. In a clutch-type automatic transmission equipped with a central processing unit that processes and outputs a control signal to the clutch drive means, when the vehicle is running and the amount of accelerator pedal depression is constant or increasing, the acceleration of the vehicle is The clutch is in a half-clutch state until the value becomes negative and the value of the change reaches a certain value, and the clutch is disengaged when the value exceeds that value.

[For production]

When the vehicle speed decreases even though the amount of accelerator depression is constant or increasing, the clutch is controlled from a half-clutch to a clutch-disengaged state according to the magnitude of the negative acceleration at that vehicle speed, and an excessive load is applied to the engine. is prevented.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 2 is a block diagram showing the control system of a clutch type automatic transmission. In this diagram, 1 is a vehicle speed sensor that detects the vehicle speed, 2 is an accelerator stroke detection sensor that detects the amount of depression of the accelerator pedal, and 3 is an engine Throttle opening detection sensors 1 and 4 detect the throttle opening of the vehicle, acceleration detection sensors 5 detect the acceleration of the vehicle, and clutch stroke detection sensor 5 detects the actuation stroke of the clutch.
Reference numeral 6 denotes a first/second gear position ratio sensor that detects the switching position of the first gear and the second gear, which are the change gears of the transmission.

Among the detection signals from these detection sensors, the detection signal from the vehicle speed detection sensor 1 is directly input to the CPU (central processing unit) 7, or the detection signals from other detection sensors are input to A.
The signal is A/D converted by a /D converter 8 and input to the CPU 7. 9 is a ROM (memory device), and this ROM 9 stores the relationship shown in Fig. 3, that is, the relationship in which the throttle opening increases in proportion to the amount of depression of the accelerator pedal. It is designed to be input to the CPU 7. 10 is a throttle opening controller controlled by an output signal from the CPU 7, 11 is a clutch actuator, and 12 is a 1st/2nd gear shift actuator. Both actuators 11 and 12 are driven by an actuator drive circuit 13. It is supposed to be done. The actuator drive circuit 13 is controlled by a pressure signal obtained by converting an output signal from the CPU 7 by a D/A converter 14.

In the control system described above, when the accelerator pedal is depressed and the engine speed increases and the vehicle speed increases, the
Shift up from 1st gear to 2nd gear by disengaging the clutch, shifting the gear, and engaging the clutch. Conversely, when the vehicle speed decreases, the gear shift is automatically performed from 2nd gear to 1st gear, clutch disengaged, 1st gear shift, and clutch engaged.

Based on the data shown in Figure 3 stored in ROM 9, whether the accelerator pedal is being depressed at a constant rate or not,
Alternatively, if the amount of depression of the accelerator pedal is gradually increased, the throttle opening degree corresponds to the amount of depression of the accelerator pedal.

The throttle opening degree or the increase in the opening degree at this time is detected by the throttle opening detection sensor 3 and inputted to the CPU 7. On the other hand, the acceleration detection sensor 4 detects the acceleration of the vehicle speed at that time.

If the detected acceleration is negative even though the throttle opening is in the above-mentioned state, the clutch engagement amount for the negative acceleration determined in advance from experimental values, that is, the engine stall will not occur at this time. The CPU 7 reads the data stored in the ROM 9 so that the clutch engagement amount reaches the limit of the clutch engagement amount, and outputs a signal from the CPU 7 to the actuator drive circuit 13 to control the clutch actuator 11 to bring it into a half-clutch state. .

Furthermore, when the negative acceleration increases until it reaches the engine stall limit at that time, a clutch number command is issued.

The above control method is shown in a flowchart as shown in the Nth flowchart. In the figure, α0 is the negative carburization at the engine stall limit determined in advance from experimental values, and α is the acceleration at that time.

〔Effect of the invention〕

According to the present invention, when the vehicle is running with the accelerator pedal depressed at a constant level or gradually increasing, and the load on the vehicle increases due to going uphill or going into mud, the engine will respond to the load. Before the engine stalls, the clutch enters a half-clutch state or a clutch disengaged state, which prevents the engine from stalling unexpectedly while driving uphill.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a flowchart, FIG. 2 is a block diagram showing a control system, and FIG. 3 is a diagram showing the relationship between accelerator pedal depression and throttle opening. 1 is a vehicle speed detection sensor, 2 is an accelerator pedal stroke detection sensor, 3 is a throttle opening detection sensor, 4 is an acceleration detection sensor, 5 is a clutch stroke detection sensor, 6 is a 1st/2nd gear position detection sensor, 7 is a CPU , 9 is RO
M, 10 is a throttle opening controller, 11 is a clutch actuator, 12 is a first/second gear shift actuator, and 13 is an actuator drive circuit. Figure 1 Figure 3 Accelerator

Claims (1)

[Claims] An accelerator pedal stroke detection means, an engine throttle opening detection means, a vehicle acceleration detection means, a clutch stroke detection means, a throttle opening control means, a clutch driving means, and an accelerator pedal depression amount and throttle opening detection means. A clutch-type automatic transmission comprising a storage means that stores the relationship, and a central processing unit that performs arithmetic processing based on the detection signals from each of the detection means and the data from the storage device and outputs a control signal to the clutch drive means. When the vehicle is running and the amount of accelerator pedal depression is constant or increasing, the vehicle's acceleration becomes negative and the clutch remains in a half-clutch state until the change reaches a certain value; A clutch control method for a clutch type transmission, characterized in that the clutch is disengaged when the value of .