JPH05312059A - Shift shock relieving device for automatic transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] A shift shock reduction device for an automatic transmission that reduces the shift shock by reducing the engine torque during a shift of the automatic transmission, regardless of the type of fuel used in the engine. Do the same. A torque down control means (e) for determining a torque down amount according to the type of fuel detected by the fuel detection means (c) and performing torque down control to obtain the determined torque down amount during a torque down request shift. Was established.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift shock reducing device for an automatic transmission, which reduces gear shift shock by reducing engine torque during gear shifting of the automatic transmission.

[0002]

2. Description of the Related Art Conventionally, a shift shock reducing device for an automatic transmission, which reduces a shift shock by reducing an engine torque during a shift of the automatic transmission, is disclosed, for example, in JP-A-56-39925. It has been known.

[0003]

However, in the above-described conventional gear shift shock reducing device for an automatic transmission, the torque reduction control is performed regardless of the type of fuel used in the engine (for example, premium or regular). Since it is a device that performs the same control, for example, when the ignition timing and the fuel injection time are shortened by the same amount of time when using premium gasoline and regular gasoline under the same speed change conditions, the torque reduction amount is a premium. Different from the fact that it becomes a large amount on the gasoline side, the magnitude of the engine torque at the time of shifting varies, and the shift shock determined by the magnitude of the input torque (engine torque) to the automatic transmission is not the same.

The present invention has been made in view of the above problems, and in a shift shock reducing apparatus for an automatic transmission, which reduces shift shock by reducing engine torque during gear shifting of the automatic transmission, The task is to reduce the shift shock regardless of the type of fuel used in the vehicle.

[0005]

In order to solve the above problems, in the shift shock reducing device for an automatic transmission according to the present invention, the torque down amount is determined according to the type of fuel detected by the fuel detecting means, and the torque down is performed. Torque down control means is provided for performing the torque down control so that the determined torque down amount can be obtained during the required gear shift.

That is, as shown in the claim correspondence diagram of FIG. 1, engine torque changing means a for changing the engine torque according to an external command, and torque down for judging whether or not the automatic transmission is in a torque down request shift. A demand change time determination means b, a fuel detection means c for detecting the type of engine fuel, a torque down amount determination means d for determining a torque down amount according to the type of fuel detected by the fuel detection means c, And a torque down control means (e) for outputting a torque down command to the engine torque changing means (a) so that the torque down amount determined by the torque down amount determining means (d) can be obtained during the torque down request shift. It is characterized by

As the engine torque changing means a,
For example, a means for changing the fuel injection time, a means for changing the ignition timing, a means for changing the intake air amount, or a means for changing the supercharging capacity are used.

As the fuel detecting means c, for example, means for detecting the optimum value of the ignition timing or analyzing the exhaust gas after combustion to detect the kind of fuel is used.

The torque reduction amount determining means d may be a means for determining the torque reduction amount in accordance with the type of fuel so that the engine torque after the torque reduction becomes a predetermined torque. Torque
It may be changed depending on the engine load, the engine speed, and the gear position.

[0010]

The type of engine fuel is detected by the fuel detecting means c while the vehicle is traveling.

When the torque down request gear shift determination means b determines that the automatic transmission is in the torque down request gear shift, the torque down amount determination means d determines the fuel detected by the fuel detection means c. The torque reduction amount is determined according to the type, and the torque reduction control means e
At, the torque down command is output to the engine torque changing means a so that the torque down amount determined by the torque down amount determining means d is obtained.

Therefore, by including the type of fuel in the torque down control information and determining the amount of torque down according to the type of fuel, the shift shock reduction is also performed regardless of the type of fuel used in the engine. be able to.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure will be described.

FIG. 2 is an electronic diagram of an engine and an automatic transmission to which the shift shock reducing device of the embodiment corresponding to the present invention described in claim 1, claim 3, claim 6, claim 8 and claim 9 is applied. It is a figure which shows a control system.

In FIG. 2, 1 is an engine control computer (hereinafter abbreviated as ECU), 2 is an automatic transmission control computer (hereinafter abbreviated as ATCU), 3 is a first signal line, 4 is a second signal line, 5 is an engine, 6 is an automatic transmission,
Reference numeral 7 is a power transistor unit, 8 is a shift solenoid, 9 is an engine speed sensor, 10 is an intake air amount sensor, and 11 is other sensors and switches.

The ECU 1 carries out the following ignition timing control in response to an ignition timing control command to the power transistor unit 7.

A) The ignition timing is stored in advance, and the optimum ignition timing is controlled according to the operating conditions (engine speed, fuel injection amount, water temperature, etc.) b) The ignition timing is retarded when knocking occurs. Control for correcting ignition timing such as advancing ignition timing when knocking does not occur and adjusting to optimal ignition timing corresponding to octane number of fuel used c) When shifting by automatic transmission 6 When the torque down request signal is input from the ATCU2, the torque down permission response signal is output to the ATCU2, and the ignition timing is controlled to obtain the torque down amount according to the octane number of the fuel used. Based on the information, vehicle speed information, and other preset shift schedules, the optimum gear position for the running and vehicle conditions is determined, and the shift Performs a shift control in shift command to the solenoid 8, and outputs a torque down request signal to the ECU1 during torque reduction required gear occurrence of shift shock is concerned. In response to the torque down request signal, a torque down permission response signal is received from the ECU 1 to mutually confirm the torque down.

Next, the operation will be described.

(A) Torque down control process executed by ECU FIG. 3 is a flowchart showing the flow of the torque down control process operation by the ignition timing executed by the ECU 1.
Each step will be described.

At step 30, the AT is executed in the ECU 1.
It is determined whether or not the torque down request signal is input from the CU 2 (corresponding to torque down shift determination means).

At step 31, information on the gear position of the automatic transmission 6 (from the gear position signal from the ATCU 2), the engine speed (from the engine speed sensor 9), and the intake air amount (from the intake air amount sensor 10). Is entered.

In step 32, it is determined whether the fuel used is premium gasoline. As for this judgment, as described above, the ECU 1 performs the ignition timing retard / advance correction,
With the control for adjusting the ignition timing to the optimum ignition timing corresponding to the octane number of the used fuel, it is detected whether or not the used fuel is premium gasoline by the optimally set ignition timing (corresponding to fuel detection means).

In step 33, the torque reduction amount for premium gasoline is determined (corresponding to torque reduction amount determining means).

In step 34, the torque down amount for regular gasoline is determined (corresponding to torque down amount determining means).

In the torque reduction amount determination in steps 33 and 34, the engine torque (torque during shifting) after torque reduction is determined by the gear position, engine speed and intake air amount regardless of the difference in the fuel used. Torque is determined.

In step 35, the normal ignition timing control by the above a) and b) is performed. In step 36, the ignition timing is determined according to the torque reduction amount determined in step 33 or step 34 and the control content in step 35.

At step 37, an ignition timing control command for obtaining the ignition timing determined at step 36 is output.

(B) Shift shock reducing action When the torque down request shift is made when the fuel used is premium gasoline, step 30 → step 31 in FIG.
→ Step 32 → Step 33 → Step 36 → Step 37 is followed. In Step 37, the gear shift torque is determined by the gear position, the engine speed and the intake air amount, as shown in Fig. 4A. With a constant torque set as above, a command for outputting a large torque down amount determined so as to obtain the torque during shifting is output.

On the other hand, at the time of a torque down request gear shift when the fuel used is regular gasoline, the flow proceeds in the order of step 30 → step 31 → step 32 → step 34 → step 36 → step 37 in FIG. As shown in (4) (4), the shift torque is set to a constant torque determined by the gear position, the engine speed and the intake air amount, and a small torque down amount determined to obtain this shift torque. Is output. Therefore, the type of fuel is included in the torque down control information, and the amount of torque down is determined according to the type of fuel so that a constant torque during shifting can be obtained.
Regardless of regular, gear shift shock can be reduced.

As described above, the gear shift shock reducing device for the automatic transmission according to the embodiment has the following effects.

(1) In a shift shock reducing device for an automatic transmission that reduces the shift shock by reducing the engine torque during shifting of the automatic transmission 6, the amount of torque reduction is determined according to whether the fuel used is premium or regular. However, since the device for performing the torque down control that obtains the determined torque down amount at the time of the requested torque down shift, the same shift shock reduction can be performed regardless of whether the fuel used for the engine 5 is premium or regular. it can.

(2) As the fuel detecting means, the knocking control of the ignition timing is detected by utilizing the fact that the control amount is different between premium gasoline and regular gasoline having different octane numbers, and therefore the fuel composition components are analyzed. It is possible to detect the fuel used cost-effectively only by the judgment based on the internal storage data in the ECU 1 without using such a sensor.

(3) In determining the torque reduction amount, the torque during shifting is determined to be constant regardless of the type of fuel used, and the torque during shifting is determined by the gear position, the engine speed and the intake air amount. Since the determination is made according to the state information, it is possible to make the shift shock reduction substantially the same level regardless of whether the fuel is premium or regular, and to obtain a high shift shock reduction effect regardless of the vehicle state.

Although the embodiments have been described above with reference to the drawings, the specific structure is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

In the embodiment, when the torque reduction amount is determined, the torque during shifting is determined to be constant regardless of the type of fuel used, but the torque reduction amount is determined according to the type of fuel used. The magnitude of the obtained coefficient may be changed. In this case, the torque during shifting is not always constant, but the variation in torque during shifting is suppressed to a small level.

In the embodiment, an example of changing the ignition timing is shown as the engine torque changing means, but there are other means as follows.

(1) Means for changing the fuel injection time (2) Means for changing the intake air amount (3) Means for changing the supercharging capacity of the compressor or turbo (4) Means for changing the throttle opening As the fuel detection means, knock control is performed to properly control ignition timing by retarding / advancing the ignition timing in order to suppress knocking, and the fact that the control amount differs between premium gasoline and regular gasoline with different octane numbers is used. Although the example of detecting by the above is shown, there are other means as follows.

(1) A means for detecting the kind of fuel by analyzing the exhaust gas by utilizing the fact that the components of the exhaust gas after combustion differ depending on the composition components.

(2) A means for detecting the type of fuel at the switching position of the vehicle by installing a fuel type changeover switch which can be manually changed by a driver or the like in the passenger compartment.

[0041]

As described above, according to the present invention, in the shift shock reducing device for an automatic transmission, which reduces the shift shock by reducing the engine torque during shifting of the automatic transmission, the fuel detecting means is used. Since the torque reduction amount is determined according to the detected fuel type, and the torque reduction control means for performing the torque reduction control to obtain the determined torque reduction amount at the time of the gear shift request gear shift is used for the engine. It is possible to obtain the effect that the shift shock can be reduced regardless of the type of fuel.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to claims showing a shift shock reducing device for an automatic transmission according to the present invention.

FIG. 2 is a diagram showing an electronic control system of an engine & automatic transmission to which the shift shock reducing device of the embodiment is applied.

FIG. 3 is a flowchart showing a flow of an ignition timing torque down control processing operation performed by the ECU of the embodiment.

FIG. 4A is a shift engine torque characteristic diagram when premium gasoline is used, and FIG. 4B is a shift engine torque characteristic diagram when regular gasoline is used.

[Explanation of symbols]

 a engine torque changing means b torque down request shift determining means c fuel detecting means d torque down amount determining means e torque down control means

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Claims (9)

[Claims] 1. An engine torque changing means for changing engine torque according to a command from the outside, a torque down request gear change judging means for judging whether or not the automatic transmission is in a torque down request gear change, and an engine fuel type. Fuel detecting means for detecting, torque down amount determining means for determining a torque down amount according to the type of fuel detected by the fuel detecting means, and torque down amount determining means during a torque down request shift And a torque down control means for outputting a torque down command to the engine torque changing means so that a torque down amount can be obtained. 2. The shift shock reducing device for an automatic transmission according to claim 1, wherein the engine torque changing means is a fuel injection time changing means which is performed by changing a fuel injection time. 3. The shift shock reducing device for an automatic transmission according to claim 1, wherein the engine torque changing means is an ignition timing changing means which is performed by changing an ignition timing. 4. The shift shock reducing device for an automatic transmission according to claim 1, wherein the engine torque changing means is an intake air amount changing means which is performed by changing an intake air amount. 5. The engine torque changing means is a supercharging capacity changing means for changing the supercharging capacity of a compressor or a turbo.
A shift shock reducing device for an automatic transmission as described. 6. The fuel detecting means is means for detecting the optimum value of the ignition timing.
A shift shock reducing device for an automatic transmission according to claim 5. 7. The fuel detecting means is a means for analyzing and analyzing exhaust gas after combustion.
A shift shock reducing device for an automatic transmission according to claim 5. 8. The torque reduction amount determining means is means for determining the torque reduction amount according to the type of fuel so that the engine torque after the torque reduction becomes a predetermined torque. A shift shock reducing device for an automatic transmission according to any one of claims 1 to 7. 9. The shift shock reducing device for an automatic transmission according to claim 8, wherein the predetermined torque is a torque that is changed according to an engine load, an engine speed and a gear position.