KR19980047112A - Engine torque reduction delay method of automatic transmission - Google Patents

Abstract

The present invention relates to a method for reducing the engine torque of an automatic transmission for delaying the TCU from misrecognizing an actual engine RPM and outputting a command for reducing the output torque of the engine earlier than the original shift point.

Step S101 of determining whether the current vehicle speed is 40 Km / h or less from the vehicle speed sensor 1, and if the current vehicle speed is 40 Km / h or less, the current range is determined by the input signal of the inhibitor switch 3. Determining whether S is one of the D, S, and L ranges (S102); and if the current range is one of the D, S, and L ranges, sensing values of the turbine sensor 5 and the output sensor 7 are determined. Determining whether the current shift stage is one of 2 speed, 3 speed and 4 speed by calculating the gear ratio on the basis of the step (S103), and if the current shift speed is one of 2 speed, 3 speed and 4 speed selected Determining whether the shift stage is the 1st speed or the 3rd speed (S104), and if the selected shift speed is the 1st speed or the 3rd speed, operating the timer 12 to delay the command for retarding the ignition timing (S105), and the ECU The engine 21 reduces the engine torque by receiving the signal delayed by the timer 12 and retarding the ignition timing. Consists of step S106.

Thereby, by delaying the TCU misrecognizing and reducing the engine torque reduction early, there is an effect that the engine torque is maintained at the time of shifting and the shifting performance can be improved.

Description

Engine torque reduction delay method of automatic transmission

The present invention relates to a method for delaying engine torque reduction of an automatic transmission, and more particularly, to automatically delay a TCU incorrectly recognizing an actual engine RPM and outputting a command that reduces the output torque of the engine earlier than the original shift point. The present invention relates to a method for delaying engine torque reduction of a transmission.

A conventional case will be described with reference to FIG. 1.

In general, in the automatic transmission vehicle, the elements of the planetary gear device are frequently fixed and opened by the clutch or the brake during the shift operation. At this time, the torque of the propulsion shaft also changes due to the change of torque shared by each element and the inertial force of the rotating part, and this change of torque becomes a shifting shank, which causes discomfort to the passenger. In order to alleviate this shift shank, shift control with less torque fluctuations should be carried out. Therefore, in order to suppress torque fluctuations at the time of shifting, the engine's ignition timing is delayed (delayed) from the standard position, thereby temporarily lowering the output torque of the engine transmitted at the time of clutch operation.

However, when the shift stage is downshifted by stepping on the accelerator pedal again in a coasting driving state in which the accelerator pedal is driven off the accelerator pedal, the torque converter is set to a stall state in the A region. At this time, the output shaft rotation speed is vibrated, and this vibration phenomenon is incorrectly recognized by the TCU as the rotation speed is increased, so that the ignition timing of the engine is perceived from the standard position in order to suppress the torque fluctuation during shifting. There was a case where a command to delay) is output to the engine ECU. Therefore, a problem arises in that the transmission performance is lowered because the output torque of the engine transmitted at the time of clutch operation is reduced before the shift point.

Accordingly, an object of the present invention is to overcome the above-described conventional problems, and an object of the present invention is to introduce an inhibitor timer so that an engine of an automatic transmission capable of delaying a perceptual command of an ignition timing that the TCU misrecognizes and outputs to the engine ECU can be delayed. It is to provide a torque reduction delay method.

As an example of the engine torque reduction delay method of the automatic transmission for achieving the object of the present invention, determining whether the current vehicle speed is 40 Km / h or less from the vehicle speed sensor, and, if the current vehicle speed is 40 Km / h or less And determining whether the current range is one of the D, S, and L ranges based on the input signal of the inhibitor switch. If the current range is one of the D, S, and L ranges, the turbine sensor and the output sensor Calculating the gear ratio based on the sensing value to determine whether the current shift speed is one of 2 speed, 3 speed and 4 speed, and if the current shift speed is one of 2 speed, 3 speed and 4 speed, Determining whether the shift stage is 1st speed or 3rd speed; if the selected shift speed is 1st speed or 3rd speed, operating a timer to delay the command to perceive the ignition timing, and the ECU outputs the delayed signal by the timer. The engine torque is reduced by retarding the ignition timing.

With such a configuration, the engine torque reduction delay method of the automatic transmission according to the present invention can delay the TCU from misrecognizing the engine torque reduction early so that the engine torque can be maintained at the time of shifting and the shift performance can be improved.

1 is a conventional engine rotational speed diagram according to time

2 is a configuration diagram of an engine torque reduction system of an automatic transmission according to the present invention.

3 is a ignition timing diagram of a typical engine

Figure 4 is a flow chart of the engine torque reduction delay method of the automatic transmission according to the present invention

Figure 5 is the engine speed diagram with time according to the invention

<Explanation of symbols for main parts of drawing>

1: vehicle speed sensor 3: inhibitor switch

5 turbine sensor 7 output sensor

11: TCU 12: Timer

21: ECU

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 4.

2, the engine torque reduction system of the automatic transmission according to the present invention is transmitted to the vehicle speed sensor (1) for detecting the speed of the vehicle, the inhibitor switch (3) for detecting the current range, and the automatic transmission A turbine sensor 5 for sensing the rotational speed of the engine, an output sensor 7 for sensing the rotational speed of the propulsion shaft transmitted from the automatic transmission to the propulsion shaft, a throttle opening degree sensor 9 for sensing the throttle opening degree, and the switch And a TCU 11 that receives the signal sensed by the sensor and controls the entire system, a timer 12 delaying the ignition timing perception signal output from the TCU 11, and a TCU delayed by the timer 12. An engine control unit (ECU) 21 reduces the output torque of the engine by adjusting the ignition timing of the mixer in response to the output signal of (11).

In general, the output torque of the engine temporarily decreases when the engine ignition timing is delayed when the transmission shifts. The engine torque reduction (ETR) amount is preset in the TCU 11 for each gear stage and for the engine speed. As shown in FIG. 3, the engine torque reduction (ETR) amount is -10 ° to + 30 ° from the top dead center (TDC). Given within the range. Here, -10 ° means that the ignition timing is perceived by 10 ° relative to the top dead center, and + 30 ° means that the ignition timing is advanced by 30 ° based on the top dead center.

By the above configuration, the engine torque reduction delay method of the automatic transmission of the present invention will be described with reference to FIG.

First, in order to know whether the vehicle is currently in a coasting driving state, it is determined from the vehicle speed sensor 1 whether the current vehicle speed is 40 Km / h or less (S101). If the current vehicle speed is 40 Km / h or less, the input signal from the inhibitor switch 3 determines whether the current range is one of the D, S, and L ranges (S102), and the current range is D. , One of the S and L range, the gear ratio is calculated based on the sensing values of the turbine sensor 5 and the output sensor 7 to determine whether the current shift stage is one of two, three and four speeds. (S103). If the current shift speed is one of 2 speed, 3 speed and 4 speed, it is determined whether the selected speed change speed is 1 speed or 3 speed (S104). As a result, the torque converter is in a quasi-stall state, which is regarded as an A region (shown in Fig. 5) in which the output side rotation speed vibrates. If the TCU 11 determines that it is the A region, the TCU 11 operates the timer 12 to delay a command to delay the ignition timing. The timer 12 has a delay time for shifting from 2 speed to 1 speed, from 3 speed to 1 speed, and from 4 speed to 3 speed. The ECU 21 receives the signal delayed by the timer 12 and reduces the engine torque by retarding the ignition timing (S106).

If the current vehicle speed is not 40 Km / h or less, or the current vehicle speed is 40 Km / h or less, but the current range is not one of the D, S and L ranges, or the current speed is 2 speed, If it is not one of the 3rd speed and the 4th speed, or if the selected shift stage is not the 1st speed or the 3rd speed, the step S101 of determining whether the current vehicle speed is 40 Km / h or less is repeated.

As described above, the engine torque reduction delay method of the automatic transmission according to the present invention has an effect that the engine torque is maintained at the time of shifting by delaying the TCU by misrecognizing the engine torque reduction early, thereby improving shift performance.

What has been described above is only one embodiment for carrying out the engine torque reduction delay method of the automatic transmission according to the present invention, and the present invention is not limited to the above-described embodiment, and the present invention claims in the following claims. Various changes can be made by those skilled in the art without departing from the gist of the invention.

Claims (2)

Determining from the vehicle speed sensor 1 whether the current vehicle speed is 40 Km / h or less (S101); If the current vehicle speed is 40 Km / h or less, determining whether the current range is one of D, S, and L ranges by the input signal of the inhibitor switch 3 (S102); If the current range is one of the D, S, and L ranges, the gear ratio is calculated based on the sensing values of the turbine sensor 5 and the output sensor 7, and the current shift stage is in the 2nd, 3rd and 4th speeds. Determining whether it is one (S103); If the current shift stage is one of 2 speed, 3 speed, and 4 speed, determining whether the selected shift stage is 1 speed or 3 speed (S104); If the selected gear stage is 1 speed or 3 speed, operating the timer 12 to delay a command for retarding the ignition timing (S105); The ECU 21 reduces the engine torque by receiving the signal delayed by the timer 12 and retarding the ignition timing (S106). Engine torque reduction delay method of the automatic transmission, characterized in that consisting of. The method of claim 1, If the current vehicle speed is not 40 Km / h or less, or the current vehicle speed is 40 Km / h or less, but the current range is not one of the D, S and L ranges, or the current speed is 2 speed, If it is not one of three speeds and four speeds, or if the selected speed change stage is not one speed or three speeds, the step (S101) of determining whether the current vehicle speed is 40 Km / h or less is repeated. Torque reduction delay method. Water temperature up and down -30 ℃ 31-40 ℃ 41-50 ℃ 51 ~ 60 ℃ 61 ° C- Shift up _-5。 -4. -3。 -2. -One. Shift down +5。 +4。 +3。 +2。 +1。