JPH0522687Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an automatic transmission device for a vehicle.

(Prior Art) An automatic transmission device is known that automatically performs upshifting and downshifting according to a preset shift pattern based on vehicle speed and accelerator opening (Utility Model Application No. 60-23352, 61-64548, etc.).

By the way, in the case of such an automatic transmission, when shifting up, the injection lever of the engine's fuel injection pump is first throttled down to prevent the engine's rotational speed from increasing, and then the mechanical clutch between it and the engine is shut off. At the same time, gear shifts are also performed. After the gear shift is completed, the clutch is connected and the injection lever is returned to its original position to complete the upshift.

(Problem to be solved by the invention) However, in the conventional device, the injection lever of the fuel injection pump mentioned above was driven by an actuator, so when shifting up, the response of the actuator was used to initiate the gear shift. will be delayed. For this reason, when accelerating with the accelerator fully open, the start of the gear shift is delayed, and the shift-up is delayed, resulting in a problem in that the starting acceleration performance deteriorates.

In addition, when the accelerator is fully opened, the shift up is performed at the engine's maximum horsepower point determined by the fuel injection pump's governor device, and this suppresses the engine's maximum rotational speed, so leaving it in a low gear is sufficient. There was a problem in that it was not possible to accelerate, and good acceleration performance could not be obtained.

(Means for solving the problem) In order to solve this problem, this invention
As shown in FIG. 1, an automatic transmission system for a vehicle includes a shift control means 16 that performs shift-up and shift-down operations based on vehicle speed and accelerator opening. means C12 for detecting the rotational speed, and the shift control means A16 when the engine rotational speed exceeds the rotational speed corresponding to the maximum horsepower point by a predetermined value when shifting up from a low gear with the accelerator fully open.
low shift command means D1 for commanding the start of gear shifting operation;
6 is provided.

(Function) Therefore, when the engine rotational speed exceeds the rotational speed corresponding to the maximum horsepower point, the injection amount is simultaneously throttled by the governor device of the fuel injection pump, so that the speed change control means A16 promptly shifts up. I can do it. This eliminates the shift-up delay when shifting from a low gear with the accelerator fully open, and also increases the engine speed in the low gear to a rotation speed above the maximum horsepower point, ensuring good acceleration. .

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Fig. 2, 1 is an engine (diesel engine), 2 is a mechanical clutch, and 3 is a transmission. Clutch 2 has a clutch actuator 4 that drives clutch 2, and detects the stroke position of clutch 2. The transmission 3 is provided with a clutch stroke sensor 5, a gear shift actuator 6 that drives the gear shift mechanism to shift gears, and a gear position sensor 7 that detects the gear position.

8 is an accelerator pedal; 9 is a selector lever for selecting a driving range; the accelerator pedal 8 is provided with an accelerator opening sensor 10 that detects the depression angle; and the selector lever 9 is provided with a selector position sensor 11 that detects the selector position. .

Further, the engine 1 is provided with an engine rotation speed sensor 12 that detects the engine rotation speed, and the transmission 3 is provided with a vehicle speed sensor 13 that detects the vehicle speed from the main shaft.

Reference numeral 14 denotes a fuel injection pump, and the injection pump 14 is provided with a governor actuator 15 that drives a control lever according to a request and controls the engine rotational speed to a required rotational speed. In addition,
A mechanical governor may be used to control the engine speed.

16 is a control unit that controls each actuator according to detection signals from each sensor;
The control unit 16 determines the driving condition from the vehicle speed and the accelerator opening, and controls each actuator to shift up or down according to a predetermined shift pattern based on the driving condition.

During a normal shift-up, the control unit 16 first throttles the injection amount of the fuel injection pump 14, disconnects the clutch 2, returns the gear of the transmission 3 to the neutral position, and then shifts the gear to a predetermined position. Clutch 2 is connected, and actuators 4, 6,
15.

On the other hand, the control unit 16
When shifting from a low gear position (gear position 1st or 2nd gear) with the accelerator fully open (accelerator opening 100%), the engine rotational speed becomes larger by a predetermined value than the rotational speed corresponding to the maximum horsepower point. when the clutch 2 is disengaged, the gear of the transmission 3 is returned to the neutral position, the gear is then shifted to the predetermined position, the clutch 2 is engaged,
actuator 4 to return the injection amount to a predetermined amount;
6 and 15. The control unit 16 controls each actuator based on a predetermined control pattern during downshifting.

Because of this configuration, as shown in Fig. 3, during normal shift up, the fuel injection pump 1 is
After the injection amount of 4 is throttled and the clutch 2 is disengaged, a gear shift is performed (steps 23 to 29).

On the other hand, when the gear is in 1st or 2nd gear and the accelerator is fully open and the gear is shifted up, clutch 2 is disengaged when the engine rotational speed becomes a predetermined value higher than the rotational speed corresponding to the maximum horsepower point. , gear shift takes place (step
21, 22, 24-29). Note that in step 26, the control is held for a predetermined period of time in consideration of the response time of the gear shift.

That is, in this case, as shown in FIG. 4, the fuel injection amount is throttled by the governor actuator 15 of the injection pump 14 as the engine speed increases (ΔN), so there is no need to control the injection amount at the start of shift-up. It becomes.

Therefore, when accelerating from a low speed with the accelerator fully open, it is possible to quickly shift up the vehicle, thereby improving starting acceleration.

In addition, since upshifting is performed when the engine speed exceeds the maximum horsepower point,
It is possible to accelerate to a sufficiently high rotation speed in the first and second speeds, and therefore the acceleration performance from low speeds can be further improved.

Note that since the driving torque is large in the first and second gears, the engine rotation smoothly increases even if the maximum horsepower point is exceeded.

(Effect of the invention) As described above, according to the invention, when shifting up from a low gear with the accelerator fully open, the upshift is performed when the engine rotational speed exceeds the rotational speed corresponding to the maximum horsepower point by a predetermined value. Therefore, it is possible to quickly shift up from a low speed gear, and to sufficiently accelerate the vehicle at a low speed gear, thereby ensuring good starting acceleration.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention, Fig. 2 is an overall block diagram showing an embodiment of the present invention, Fig. 3 is a flowchart showing control details, and Fig. 4 shows the relationship between engine speed and fuel injection amount. This is a graph showing. 4...Clutch actuator, 6...Gear shift actuator, 7...Gear position sensor, 1
0...Accelerator opening sensor, 12...Engine rotation speed sensor, 13...Vehicle speed sensor, 15...Governor actuator, 16...Control unit.

Claims (1)

[Scope of utility model registration claim] Shift up based on vehicle speed and accelerator opening.
Shift control means 16 that performs shift down shift operation
An automatic transmission system for a vehicle equipped with a means 7 for detecting a gear position, a means 12 for detecting an engine rotational speed, and a means for detecting a gear position 7, a means 12 for detecting an engine rotational speed, and a rotation speed at which the engine rotational speed corresponds to a maximum horsepower point when shifting up from a low gear with the accelerator fully open. An automatic transmission device for a vehicle, comprising: low shift command means 16 for commanding the speed change control means 16 to start a speed change operation when the speed exceeds a predetermined value.