JPH0464889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a throttle valve control method for an internal combustion engine equipped with an automatic transmission in which a clutch each having an actuator and a gear transmission are electronically controlled.

(Prior Art) Recently, in order to transmit the power of an internal combustion engine (hereinafter referred to as the engine), a friction clutch and a gear type transmission provided at the rear of the engine are each operated by an actuator controlled by an electronic control device, such as a hydraulic drive mechanism. Automatic transmissions have appeared in which the clutch is disengaged and the transmission is automatically switched via an internal lever.

This device has a select actuator that drives the internal lever in the Y direction and a shift actuator that drives the internal lever in the X direction. A storage device is provided in which data (referred to as a shift map) storing the gear positions of the corresponding transmission is stored.

While the vehicle is driving, the electronic control unit constantly detects the vehicle speed and the amount of accelerator pedal depression, searches the shift map based on this data to find the optimal gear, and shifts based on the electronic control unit's commands. The actuator and the select actuator are driven alternately to automatically switch the gear ratio of the transmission to the optimum one.

By the way, in an engine that is connected to an electronically controlled automatic transmission as described above, when the engine speed is below a predetermined idling speed while the vehicle is climbing a slope, the gear transmission does not perform a gear change operation. In other words, it is necessary to disengage the clutch without changing the gear stage of the transmission, and in this case, the throttle valve is automatically returned (closed) at the same time as the clutch is disengaged.

(Problem to be Solved by the Invention) However, in this conventional throttle valve control method, the clutch gradually disengages, goes through a half-clutch state, and then completely disengages, whereas the throttle valve immediately returns to a fully closed state. As a result, engine braking occurs, resulting in rapid deceleration, and the drop in torque on the wheel axle due to clutch disengagement causes similarly rapid deceleration shock, causing discomfort to the driver and passengers. There was a problem of giving.

The present invention has been made in view of such conventional problems, and its purpose is to perform clutch disengagement without a gear change operation without a deceleration shock, thereby allowing the vehicle to continue running smoothly. An object of the present invention is to provide a throttle valve control method for an internal combustion engine with an automatic transmission.

(Means for Solving the Problems) A throttle valve control system for an internal combustion engine with an automatic transmission according to the present invention to achieve the above object includes an automatic transmission in which a clutch and a gear transmission each having an actuator are electronically controlled. In a throttle valve control system for an internal combustion engine, when the clutch is disengaged without shifting operation by the gear transmission, the first step is to detect that the foot has left the accelerator pedal, and the vehicle speed is less than or equal to the set vehicle speed. a second step of detecting the rotation speed of the input shaft of the gear transmission; a fourth step of detecting the current throttle valve opening degree; a fourth step of detecting the current throttle valve opening; a fifth step of determining the optimal throttle valve opening for disengaging the clutch based on the rotational speed of the clutch; a sixth step of comparing the optimal throttle valve opening with the current throttle valve opening; As a result of the comparison, the seventh step is to disengage the clutch when the current throttle valve opening is equal to or smaller than the optimum throttle valve opening, and even after the clutch is disengaged, the optimum input shaft rotation speed is maintained. It is characterized by having an eighth step for maintaining the slot opening degree.

(Function) While driving the vehicle, when the driver takes his/her foot off the accelerator pedal and attempts to disengage the clutch, the processing device (described later) determines whether or not the driver's foot is removed from the accelerator pedal, that is, whether the idle switch described later is turned on. Then, when the idle switch is on, it is determined whether the vehicle speed detected by the vehicle speed sensor (described later) is equal to or less than the set vehicle speed _V0 (step 2), and the vehicle speed is determined. When becomes equal to V ₀ or less than V ₀ ,
The input shaft rotational speed is detected (step 3), and the throttle valve opening TH is detected by the throttle valve opening sensor described later (step 4).

Next, depending on the input shaft rotation speed, determine the optimal throttle valve opening for disengaging the clutch.
TH ₁ is determined (step 5), and based on this determination, the processing device determines whether or not TH ₁ and TH outputted from the read-only memory (described later) satisfy TH≦TH ₁ (step 5). 6). Here TH
If it is determined that ≦TH ₁ , the clutch is disengaged (step 7).

After that, the throttle valve opening TH ₂ is calculated based on the input shaft rotation speed after the clutch is released.
is determined (step 8), the throttle valve opening degree is maintained at this opening degree _TH2 (step 9), and the throttle control is completed.

In this way, when the automatic transmission is controlled to disengage the clutch without a gear change operation, the shock during running is alleviated, allowing the vehicle to run stably and smoothly, and the ride comfort is improved. Ru.

(Embodiment) An embodiment of the throttle valve control method for an internal combustion engine equipped with an automatic transmission of the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is a gasoline engine, 1a is a throttle actuator thereof, 1b
is the throttle valve. 2 is a clutch for transmitting engine power, and 3 is a clutch actuator for operating the clutch, which includes a clutch drive device 4 and a clutch control device 5. 6 is a parallel shaft gear type transmission, and 7 is a transmission actuator that changes the gear ratio of the transmission 6. 8 is an input shaft rotation sensor, and 9 is a wheel drive mechanism, which includes a propeller shaft, a universal joint, and the like. 10 is a vehicle speed sensor disposed in the wheel drive mechanism 9. Reference numeral 11 denotes a control lever for operating the drive, which switches the position switch 12.
The signal emitted from 2 is sent to electronic control unit 13. Then, based on this signal, the electronic control device 13
From there, a signal corresponding to the position of the control lever 11 is given to the transmission actuator 7, and the transmission actuator 7 switches the gear ratio of the transmission 6 in accordance with the signal. That is, when the control lever 11 is in the 1st range, only the first forward speed is available, and when the control lever 11 is in the 2nd range, only the first forward speed is available.
Automatic transmission of speed and 2nd speed, control lever 11
When the control lever 11 is in the 3rd range, the automatic transmission of 1st, 2nd, and 3rd forward speeds is performed, and when the control lever 11 is in the 4th range, the automatic transmission of the 1st, 2nd, 3rd, and 4th forward speeds is performed. Automatic gear shift, control lever 11 is D
When the vehicle is in the range, automatic gear shifting is performed between forward 1st, 2nd, 3rd, 4th, and 5th speeds, and when the control lever 11 is in the R range, it is reversed, and the control lever 11 is in the N range. In some cases, set the transmission to neutral.

14 is an accelerator pedal, 15 is a throttle valve control device, 16 is a potentiometer that detects the amount of depression of the accelerator pedal 14, and 17 is an idling switch.

The throttle valve control device 15 has a drive section 15 therein that drives the throttle valve 1b.
a and a control section 15b that controls the throttle valve 1b, and controls the opening degree of the throttle valve 1b according to the depression position of the accelerator pedal 14 based on a signal from the potentiometer 16.

The electronic control device 13 also includes a read-only memory 13a that stores necessary data such as a sequence program for controlling engine operation, gear switching control data for a transmission, clutch switching control data, etc., which will be described later, and a read-only memory 13a that stores calculation results. , a readable/writable data memory 13b that stores input data, etc.
, a control memory 13c that stores a control program, a processing device 13d that performs calculations and other data processing under the control of the control program and sequence program, and an input/output interface circuit 13e. In the present invention, the electronic control unit 13 not only controls the amount of air taken into the gasoline engine 1 in accordance with the operating condition, but also controls the clutch and gear switching of the transmission. Therefore, in addition to the clutch switching data, the read-only memory 13a stores detailed data for controlling gear switching of the transmission. Then, the electronic control device 13 sequentially captures the outputs of the potentiometer 16, position switch 12, and rotation sensor 10 into the data memory 13b via the input/output interface circuit 13e, and presses the access pedal 14 corresponding to the captured data. The processing device 13d calculates and determines the optimum gear position according to the amount, the instruction of the control lever 11, and the vehicle speed, reads out the corresponding gear switching control data and clutch switching control data from the read-only memory 13a, It is output to the transmission actuator 7 and clutch actuator 3 via the input/output interface circuit 13e. Based on this data, the transmission actuator 7 and clutch actuator 3 are driven, and the transmission 6 and clutch 2 are operated to perform a gear change. The electronic control device 13
always takes in such data, determines the gear stage, and outputs control data, and controls the transmission 6 so that the gear ratio is always optimal.

The idling switch 17 also detects that the driver's foot has left the accelerator pedal 14.

Furthermore, the read-only memory 13a stores the optimal throttle opening _TH1 for disengaging the clutch according to each input shaft rotation speed, and also stores the input shaft rotation speed even after disengaging the clutch. The throttle opening degree TH ₂ based on is stored as data. These two maps are shown in Figure 3a and b. Further, 18 is a throttle opening sensor.

Next, the operation of the embodiment of the present invention, ie, the method of controlling the throttle valve, will be explained using the flowchart shown in FIG.

When the driver takes his/her foot off the accelerator pedal 14 and attempts to disengage the clutch 2 while driving the vehicle, the processing device determines whether or not the driver's foot leaves the accelerator pedal 14, that is, whether the idle switch 17 is turned on. 13d (step 1), and then, when the idle switch 17 is on, it is determined whether the vehicle speed detected by the vehicle speed sensor ₁₀ has become equal to or less than the set vehicle speed V0 (step 2). ), when the vehicle speed becomes equal to or less than V ₀ , the input shaft rotation speed is detected (step ₃ ), and the throttle valve opening TH is detected by the throttle valve opening sensor 18. (Step 4).

Next, depending on the input shaft rotation speed, determine the optimal throttle valve opening for disengaging the clutch.
TH ₁ is determined (step 5), and based on this determination, the processing device 13d determines whether or not TH ₁ and TH outputted from the read-only memory 13a satisfy TH≦TH ₁ ( Step 6). If it is determined that TH≦ _TH1 , clutch 2 is disengaged (step 7).

After that, the throttle valve opening TH ₂ is calculated based on the input shaft rotation speed after the clutch is released.
is determined (step 8), the throttle valve opening degree is maintained at this opening degree _TH2 (step 9), and the throttle control is completed.

In this way, when the automatic transmission is controlled to disengage the clutch without a shift operation, the difference in rotational torque between the input shaft and the wheel side when the clutch is disengaged can be made approximately equal, which improves running performance. This reduces shock and allows the vehicle to run more stably and smoothly, improving ride comfort.

(Effects of the Invention) According to the present invention, when disengaging the clutch without a gear shifting operation, the optimal throttle valve opening for disengaging the clutch is stored in advance in the map.
By disengaging the clutch when the current throttle valve opening is equal to or smaller, the clutch can be disengaged without causing shock, thereby improving ride comfort for the driver and others. .

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the general configuration of the vehicle's engine, transmission, and clutch. Figure 2 is a flow diagram explaining the throttle valve control method. Figure 3 is the throttle valve stored in memory. This is a map of opening data. 1; Internal combustion engine (engine), 2; Clutch,
3; clutch actuator, 6; gear type transmission, 7; transmission actuator, 8; input shaft rotation sensor, 10; vehicle speed sensor, 11;
Control lever, 12; Position switch, 13; Electronic control device, 14; Accelerator pedal, 15; Throttle valve control device, 16; Potentiometer, 17; Idling switch,
18; Throttle valve opening sensor.

Claims (1)

[Claims] 1. In a throttle valve control system for an internal combustion engine equipped with an automatic transmission in which a clutch and a gear transmission are electronically controlled, each having an actuator, when the clutch is disengaged without a shift operation by the gear transmission, the accelerator is The first step is to detect that the foot has left the pedal, the second step is to detect that the vehicle speed has fallen below the set vehicle speed, the third step is to detect the rotational speed of the input shaft of the gear transmission, and the current speed is detected. a fourth step of detecting the throttle valve opening degree; a fifth step of determining the optimal throttle valve opening degree for disengaging the clutch based on the detected rotational speed of the input shaft; and a fifth step of determining the optimal throttle valve opening degree to disengage the clutch. a sixth step of comparing the throttle valve opening with the current throttle valve opening, and a sixth step of disengaging the clutch when the current throttle valve opening is equal to or smaller than the optimum throttle valve opening as a result of the comparison; A throttle valve control system for an internal combustion engine with an automatic transmission, comprising seven steps and an eighth step for maintaining an optimum slot opening based on the input shaft rotational speed even after disengaging the clutch.