JPH03360A - Shift control device of automatic transmission - Google Patents

Abstract

PURPOSE:To conduct proper learning processing by inputting a soft idle signal to a shift time learning means, and prohibiting the shift time learning by the shift time learning means at a specified time. CONSTITUTION:A shift time learning means 22 is provided in an A/T control unit 20, and idle signals by ON, OFF are inputted from an idle switch 24 provided in a throttle chamber 14. In the shift time learning means 22, shift time learning is prohibited at the time of coast running, or when ON signal is outputted from the idle switch 24. Hence, proper learning processing can be conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a shift control device equipped with a shift time learning means for an automatic transmission, and more particularly to a shift control device that prohibits shift time learning during coasting. .

2. Description of the Related Art Conventional automatic transmissions include, for example, Japanese Patent Application Laid-Open No. 62-62
There is a device as disclosed in Japanese Patent No. 047, in which multiple friction elements incorporated in the gear train of the transmission are engaged and released as appropriate by hydraulic pressure output from a control valve, thereby automatically shifting gears. It is now being carried out in a regular manner.

By the way, when automatic transmissions are controlled to change gears, there are automatic transmissions that learn and control the line pressure so that the gearshift time is a target time. As proposed by the applicant in Japanese Patent Application No. 63-190536, the shock at the time of gear shifting is reduced by prohibiting the learning of the gear shifting time during foot-off shifting during coasting. There is.

That is, the above-mentioned foot-off shifting can be detected by the ON/OFF state of an idle switch provided in the throttle chamber (ON means the idle state), and the above-mentioned shift time learning is inhibited by manual input of the ON signal of the idle switch.

Problems to be Solved by the Invention However, in recent engines, when the coolant temperature is low, the throttle valve is automatically opened to increase the idle speed, even though the accelerator pedal is not depressed. , the idle switch provided in the throttle chamber is turned off. For this reason, when the coolant temperature is low, there is a problem in that by turning off the idle switch, it is no longer possible to prohibit shift time learning even though the foot is off.

In view of such conventional problems, the present invention provides an automatic transmission that is capable of reliably inhibiting shift time learning by detecting a substantial idle state according to ON/OFF signals of a soft idle signal. The purpose of the present invention is to provide a speed change control device.

Means for Solving the Problems In order to achieve the object, the present invention, as shown in FIG. In a shift control device for an automatic transmission in which shift time learning by the time learning means a is prohibited, a soft idle signal detecting means is provided for detecting an engine idle state by detecting a throttle opening less than a predetermined value. The configuration is such that shift time learning is prohibited when the soft idle signal is in the idle state.

Effect: With the above-described configuration, the shift control device for an automatic transmission according to the present invention can detect a substantial idle state based on the soft idle signal output from the soft idle signal detection means.

Therefore, when the soft idle signal indicates an idle state, the vehicle is coasting, so by prohibiting shift time learning at this time, accurate shift control can be performed.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows a first embodiment of a shift control device for an automatic transmission according to the present invention, where 10 is an engine and 12 is an automatic transmission.

The amount of air introduced into the engine 10 is adjusted according to the opening amount of a throttle valve 16 provided in a throttle chamber 14, and the air-fuel mixture is controlled according to this intake air amount.

On the other hand, the automatic transmission 12 is connected to the engine 10 and receives engine rotation through a torque converter (not shown), and the automatic transmission 12 is controlled from a control valve 18. This is done by appropriately engaging or releasing the friction elements using the control hydraulic pressure that is output.

By the way, the control valve 18 receives various signals outputted from an A/T control unit 20 as a speed change control device, such as a line pressure control signal and a shift valve switching signal, as disclosed in Japanese Patent Application Laid-Open No. 62-62047. The control hydraulic pressure is controlled by a signal or the like.

The various signals output from the input/T control unit 20 are based on the vehicle running conditions manually input to the A/T control unit 20, such as a vehicle speed signal, a throttle opening signal, and an A/T oil temperature signal. Determined based on

Further, a shift time learning means 22 is provided in the A/T control unit 20, and the shift time learning means 22
An idle signal of 0NOFF from an idle switch 24 provided in the throttle chamber 14 is input to the engine.

In the shift time learning means 22, learning of the shift time is prohibited during coasting, that is, when an ON signal is output from the idle switch 24.

Here, in this embodiment, an accelerator operation path 30 from the accelerator pedal 28 to the throttle valve 16 is
A means for steplessly detecting the amount of depression of the accelerator pedal 28, for example, a variable resistor 32 whose electric resistance value is changed in accordance with the depression of the accelerator pedal 28, is provided, and the variable resistor 32 is connected to a soft idle signal. It is used as a detection means.

Therefore, the variable resistor 32 can steplessly detect the amount of depression of the accelerator pedal 28, and the amount of depression of the accelerator pedal 28 corresponding to the opening degree of the throttle valve 16 determines the idling state, e.g. , when the opening degree is below 178 which is the normal idling range, this is outputted to the shift time learning means 22 as a soft idle signal ON.

Then, the shift time learning means 22 receives an OFF signal (a signal other than the idle state) from the idle switch 24.
is output, it is determined whether to prohibit or permit shift time learning based on the soft idle signal.

That is, the shift time learning means 22 is controlled according to the flowchart shown in FIG. 2, and first, in step I, it is determined whether the idle switch 24 is ON.
In the case of rYEsJ, the process proceeds to step H, where shift time learning is prohibited.

On the other hand, if it is determined to be rNOJ in step I above,
Proceeding to step ■, it is determined whether or not the soft idle signal is ON; if rYEsJ, proceeding to step H above, shifting time learning is prohibited; if rNOJ, proceeding to step ■, shifting time learning is permitted. Ru.

Next, FIG. 4 shows a flowchart of a second processing example.

In this embodiment, step (2) for determining the engine cooling water temperature and step (2) for determining the idle state by soft idle are added to the first embodiment, and the idle switch 24 is OFF, that is, step 1 is set to rNOJ. If it is determined, the engine cooling water temperature is determined in step ■, and if it is equal to or higher than the predetermined value, it is determined that rYEsj,
Determine the throttle opening in step ■ and set θ. If it is determined that the value is larger than that, the soft idle signal is turned ON, and shifting time learning is prohibited.

Next, in step (2), when the engine cooling water temperature is less than a predetermined value, it is determined that rNOJ, and in step (2), the throttle opening degree is determined and set to a predetermined value θ. If it is determined that the value is greater than 10, the soft idle signal will be turned on and the shift time learning will be prohibited.

Therefore, even when the idle switch 24 is out of order, accurate shift time learning control can be performed in step (2).

Further, FIG. 5 shows a flowchart of the third processing example.

In this embodiment, the road surface condition is determined, and if the road is rough, a soft idle signal is used to determine whether to permit or prohibit shift time learning, and if the road is good, the idle switch 24 is used.

According to this embodiment, it is possible to prevent inadequacies caused by malfunction of the idle switch 24 due to vibrations caused when driving on a rough road by permitting or prohibiting shift time learning.

With the above configuration, in the automatic transmission shift control device of this embodiment, since the cooling water temperature is increased after the engine 10 is warmed up, the throttle chamber 14 is opened and closed by pressing the accelerator pedal 28. It changes according to the amount,
In a coasting state in which the accelerator pedal 28 is released, the throttle chamber 14 is closed and the idle switch 24 outputs an ON signal.

Therefore, in this case, learning of the shift time by the shift time learning means 22 is prohibited by the ON signal of the idle switch 24.

Note that this prohibition of learning the shift time is performed not only when the vehicle is coasting, but also when the vehicle is idling while the vehicle is stopped.

On the other hand, when the cooling water temperature is low, the throttle chamber 14 is opened even though the foot is off, so the idle switch 24 outputs an OFF signal, but in this case, the accelerator pedal 28 is not depressed. Therefore, the soft idle signal is turned on, and the above-mentioned shift time learning is prohibited by turning on the soft idle signal.

Therefore, even during coasting immediately after starting the engine 10 at a low temperature, the shift time learning can be reliably prohibited.

Incidentally, when the soft idle signal is OFF, it means that the accelerator pedal 28 is being depressed, and in this case, the accelerating running state is in progress, so the shift time learning means 2
Step 2 is to perform shift time learning as usual.

Further, in this embodiment, the throttle opening signal output from the variable resistor 30 is manually input to the A/T control unit 20.
Although the idle position is detected by software within the A/T control unit 20, the invention is not limited to this, and the soft idle signal used in conventional engine control units can be inputted to the A/T control unit 20, This can be used as a prohibition condition for shift time learning.

Furthermore, when using the soft idle signal of the engine control unit in this way, since the soft idle signal is used for fuel cut during coasting,
It becomes possible to detect more accurate coast conditions,
This is preferable.

Incidentally, in this embodiment, the case where the soft idle signal and the idle switch 24 are used together is disclosed, but the invention is not limited to this, and the idle switch 24 can be abolished and only the soft idle signal can be used.

As described in detail of the invention, in the shift control device for an automatic transmission of the present invention, a soft idle signal is input to the shift time learning means, and when the soft idle signal indicates an idle state, the shift time learning is performed. Shift time learning by means is now prohibited, so even if the throttle valve is open when coasting in a cold state, such as immediately after the engine is started, shift time learning can be prohibited by means of a soft idle signal. This has the effect that proper learning processing can be performed.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram showing the concept of the present invention, Fig. 2 is a schematic block diagram showing an embodiment of the present invention, and Fig. 3 is a flowchart showing a first processing example when executing the control of the present invention. , 4th
The figure is a flowchart showing a second processing example of the invention, and FIG. 5 is a flowchart showing a third processing example of the invention. 10...Engine, 12...Automatic transmission, 14...
- Throttle chamber, 20...A/T control unit (shift control device), 22...shift time learning means, 24...idle switch, 32...variable resistor (soft idle detection means). Figure 3 3 people outside Figure 4 Figure 5

Claims (1)

[Claims] (1) In a shift control device for an automatic transmission, which is equipped with a shift time learning means and in which the shift time learning by the shift time learning means is prohibited when a signal for detecting the idle state of the engine is input, the gear shift time learning means is prohibited from learning the shift time by a predetermined value or less. automatic gear shifting characterized in that a soft idle signal detecting means is provided to detect the idle state of the engine by detecting the throttle opening of the engine, and when the soft idle signal indicates the idle state, shifting time learning is prohibited. Machine speed control device.