KR19980017077A - Throttle Tip-In Control for Automatic Transmission Vehicles - Google Patents

Abstract

The present invention compares whether the engine output control is completed before starting the torque delay signal output operation to alleviate the shift shock by delaying the output of the engine so that the one-way clutch is gradually engaged even if the throttle tip-in is detected in the automatic transmission vehicle. A first step of determining a finish flag state to determine; A second step of comparing and determining whether the torque delay signal is output once to determine the torque delay work state when it is determined that the engine output control is not completed in the first step; A third step comprising a plurality of determination steps for detecting whether the power-off speed 1 and the throttle tip-in operation are performed when it is determined that the engine torque delay signal is not output in the second step; A fourth step of comparing and determining a plurality of torque delay canceling conditions in order to control the torque delay canceling when it is determined that the engine torque delay signal is output once in the second step; A fifth step of fixing the torque flag to 1 and outputting a torque delay signal when it is determined whether the power-off speed is 1 or the throttle tip-in operation in the third step; A sixth step of outputting a torque delay cancel signal while setting a finish flag to 1 and a torque flag to 0 when the torque delay cancel condition is satisfied in the fourth step; And a seventh step of outputting a continuous torque delay signal when the torque delay release condition is not satisfied in the fourth step.

Description

Throttle Tip-In Control for Automatic Transmission Vehicles

(A) of FIG. 1 is a duty pattern diagram applied to the hydraulic control solenoid valve made in a control state from 2nd speed to 1st speed,

(B) of FIG. 1 is a waveform diagram for the torque delay request signal,

2 is a flowchart illustrating a method of reducing an impact when engaging a one-way clutch of an automatic transmission vehicle according to an exemplary embodiment of the present invention.

[Industrial use]

The present invention relates to a throttle tip-in control method of an automatic transmission vehicle, and more particularly, is generated by changing to a power-on state by a tip-in operation of a throttle in a power off first speed state. The present invention relates to a throttle tip-in control method of an automatic transmission vehicle that reduces a shift shock caused by sudden engagement of a one-way clutch and improves a shift feeling.

[Prior art]

As is known, the automatic transmission has a torque converter connected to the output shaft of the engine and a multistage shift mechanism connected to the pump impeller of the torque converter, and according to the operating state of the vehicle, one of the gear stages of the shift gear mechanism Hydraulically actuated friction elements for selecting stages.

Each friction element of the transmission gear mechanism is operated / released by the hydraulic pressure provided in a separate hydraulic system to perform a shift. In addition, the transmission gear mechanism is a reverse driving state in which the vehicle is driven beyond the engine output by an external force. An in power off state occurs.

In this power-off 1-speed state, a planetary gear carrier whose one end is fixed to a one-way clutch that operates as a reaction force element in the 1-speed state of normal driving is reduced by 1 speed due to the reduction in the number of revolutions of the turbine runner of the torque converter. In this case, the one-way clutch may be in a free wheel state that rotates together with the planetary gear carrier.

In this way, when the driving condition of the vehicle is downshifting from the power-off 2 speed to the 1 speed or the power-off state at the 1-speed state, when the tip-in operation of the throttle is applied, the vehicle runs at the power of the engine in the power-off state As the power-on state is changed, the one-way clutch acting as a reaction force element at one speed is momentarily engaged by the planetary gear carrier's tendency to rotate in the reverse direction of the engine, thereby driving at the first speed in the power-on state.

[Problem to solve by the present invention]

As described above, the automatic transmission controlled as described above is one-way clutch, which is the reaction force element in the first speed state, and the one-way clutch does not act as the reaction force element in the freewheel state, that is, the power-off one speed. One-way clutch is suddenly engaged due to an increase in the number of turbine revolutions at the moment when the power is turned on in the off state, there is a problem that the shift shock is severe and the operability is reduced.

The present invention has been made in order to solve the above problems, and when the down-shift from the power-off 2 to 1 speed or the tip-in operation is performed in the power-off 1 speed state, the output of the engine torque is delayed for a predetermined time. The purpose is to reduce shift shock by allowing a smooth shift to be made.

[Means to solve the problem]

As a means for achieving the above object, the present invention,

A first step of determining a finish flag state to compare and determine whether the engine output control is completed before starting the torque delay signal output operation;

A second step of comparing and determining whether the torque delay signal is output once to determine the torque delay work state when it is determined that the engine output control is not completed in the first step;

In the second step, when it is determined that the engine torque delay signal is not output, a plurality of determination steps are performed to detect whether the one-way clutch does not act as a reaction force element or whether the power-off speed 1 and the throttle tip-in operation are performed. A third step made;

A fourth step of comparing and determining a plurality of torque delay canceling conditions in order to control the torque delay canceling when it is determined that the engine torque delay signal is output once in the second step;

A fifth step of fixing the torque flag to 1 and outputting a torque delay signal when it is determined whether the power-off speed is 1 or the throttle tip-in operation in the third step;

If the torque delay request time that satisfies the torque delay canceling condition is exceeded in the fourth step, the torque delay is set while setting the finish flag for completing the torque delay operation to 1 and the torque flag for canceling the torque delay to 0. A sixth step of outputting a release signal;

In the fourth step, when the torque delay request time that is not satisfied with the torque delay release condition has not elapsed, a seventh step of outputting a continuous torque delay signal is performed.

EXAMPLE

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention.

When the driver is downshifting from the power-off 2 speed to the 1 speed or the power-off 1 speed state, as shown in FIG. 1 (a), the shift control unit outputs 100% duty to the hydraulic control solenoid valve.

At this time, when the tip-in is detected in the power-off state, as shown in (b) of FIG. 1, the low signal is output for the torque delay in the “high” state.

The control operation of the present invention configured as described above is performed as shown in FIG.

First, in order to determine whether the engine power control operation starts, it is determined whether or not the finish flag is set to 1 (S110).

Here, the finish flag is set to 0 in the initialization state, and if the control is completed, the finish flag is preprogrammed to be set to 1.

Therefore, if the finish flag is 1 in the step S110, the engine output control is completed, and therefore, it is returned to the main program without any separate operation.

When the finish flag is in the 0 state instead of the 1 state in step S110, it is determined whether or not the torque flag is set to 1 in order to perform a torque delay operation (S120).

If the torque flag is not 1 in step S120, the torque delay signal corresponds to an initial state in which the torque delay signal is not output. In this case, the one-way clutch acts as a reaction force element and the throttle tip to determine whether the torque delay signal should be output. A plurality of determination steps S130 are performed to determine whether a condition for phosphorus is satisfied.

When the plurality of delay conditions presented in step S130 are satisfied, that is, when the one-way clutch is in the freewheel state in which the reaction force element is not operated and the throttle tip-in operation is being performed, the torque delay signal “low” is output. The torque flag is set to 1 (S140).

Therefore, the engine output is reduced by the generation of the torque delay signal, so that the fastening of the one-way clutch is made slowly.

When the plurality of delay conditions presented in step S140 are not satisfied, that is, when the one-way clutch is not in the free wheel state or when the throttle tip-in operation is not performed, a separate operation for torque delay is unnecessary, and therefore the return to the main program is performed. do.

In the case where the torque flag is 1 in step S120, since the torque delay signal is already output once, a plurality of comparison determination steps S150 are performed to determine whether the torque delay should be continued or the delay release signal should be output. It is.

As a result of reading the plurality of conditions in step S150, when the release condition is satisfied, the torque delay release signal “high” is output, and the finish flag is set to 1 to indicate the end of the operation, and the torque delay release signal “high” is output. The torque flag is set to 0 to indicate that the output is performed (S161).

Therefore, when the torque delay work is completed, it returns to the main program and normal driving is performed.

However, when the release condition is not satisfied in the step S150, when the torque delay is still required, the torque delay signal “low” is output (S162) and returned to the main program so that the torque delay can be continuously performed.

In the step S130 of determining a plurality of conditions for outputting the torque delay signal, it is first determined whether or not the one-way clutch is operated as a reaction force element to determine whether it is in the power-off first speed state (S131), and not as the power-off first speed. If it is determined that the return to the main program and the power-off 1 speed is determined to be a condition that can be a sudden fastening of the one-way clutch step to determine whether the battery voltage is more than 10V to determine whether the throttle tip-in (S132) ) And determining whether the throttle voltage which is variable according to the pressurized state of the accelerator pedal is 10 V or more (S133), comparing and determining whether the engine speed indicating the output state of the engine is 1500 rpm or more (S134), and the oil temperature Whether the integration time has elapsed more than 10 minutes when the temperature is 70 ° C or higher or the output shaft rotation speed is 1500rpm or more A step (S135) to.

In the step S150 of controlling the torque delay releasing signal output, the driver determines whether the torque delay request time has elapsed by 1.3 seconds or more to determine whether the torque delay signal has been output enough to sufficiently reduce the engine power (S151). Comparing and determining whether the throttle voltage is 1.2V or less to determine whether the throttle tip-in operation is completed (S152), and comparing the torque timer to 100 ms or more to determine whether the torque delay has been sufficiently achieved. Determination is made in step S153.

[Effects of the Invention]

Therefore, even if the throttle tip-in is detected, the output of the engine is delayed and the fastening of the one-way clutch is progressed gradually, thereby reducing the shift shock and thereby improving the shift feeling.

Claims (3)

A first step of determining a finish flagle state in order to compare and determine whether the engine output control is completed before starting the torque delay signal output operation; A second step of comparing and determining whether the torque delay signal is output once to determine the torque delay work state when it is determined that the engine output control is not completed in the first step; In the second step, when it is determined that the engine torque delay signal is not output, a plurality of determination steps are performed to detect whether the one-way clutch does not act as a reaction force element or whether the power-off speed 1 and the throttle tip-in operation are performed. A third step made; A fourth step of comparing and determining a plurality of torque delay canceling conditions in order to control the torque delay canceling when it is determined that the engine torque delay signal is output once in the second step; A fifth step of fixing the torque flag to 1 and outputting a torque delay signal when it is determined whether the power-off speed is 1 or the throttle tip-in operation in the third step; If the torque delay request time that satisfies the torque delay canceling condition is exceeded in the fourth step, the torque delay is set while setting the finish flag for completing the torque delay operation to 1 and the torque flag for canceling the torque delay to 0. A sixth step of outputting a release signal; And a seventh step of outputting a continuous torque delay signal when the torque delay request time that does not satisfy the torque delay canceling condition in the fourth step is not exceeded. The method of claim 1, In the third step of determining a plurality of conditions for outputting the torque delay signal, first, a comparison is made to determine whether the one-way clutch is operating as a reaction force element, and whether it is in the power-off first speed state. When it is returned to the main program and it is determined that the power-off 1 speed is a condition that the one-way clutch can be suddenly engaged, determining whether the battery voltage is higher than the reference value to determine whether the throttle tip-in is occurring and the accelerator pedal. Determining whether the throttle voltage which is variable according to the pressurized state is equal to or greater than the reference voltage, comparing and determining whether the engine speed indicating the output state of the engine is higher than or equal to the reference value, and when the oil temperature is equal to or higher than the reference value or output shaft speed Compare whether the integral time of elapsed more than the threshold time A throttle tip-in control method for an automatic transmission vehicle further comprising the step of determining. The method of claim 1, Comparing the fourth step of controlling the torque delay release signal output to determine whether the torque delay request time has elapsed more than a threshold time in order to determine whether the torque delay signal has been output enough to sufficiently reduce the engine output, and the driver has a throttle tip. Comparing and determining whether the throttle voltage is less than the threshold value to determine whether or not the operation is completed, and comparing and determining whether the torque timer has passed more than the threshold time to determine whether the torque delay has been sufficiently achieved. A throttle tip-in control method of an automatic transmission vehicle further comprising.