KR101011125B1

KR101011125B1 - Method for controlling shocks of tip-in and tip-out in 4WD system of vehicle

Info

Publication number: KR101011125B1
Application number: KR1020080062230A
Authority: KR
Inventors: 유진환
Original assignee: 쌍용자동차 주식회사
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2011-01-28
Also published as: KR20100002368A

Abstract

The present invention relates to a tip-in and tip-out impact control method of a four-wheel drive system of a vehicle by logic for minimizing the impact of tip-in and tip-out generated by a four-wheel drive system mounted on passenger cars and SUV vehicles. The method controls side operating conditions consisting of a plurality of environmental variables so that the logic for optimizing the shock is operated, or by controlling the engine torque to apply a positive torque to the drive system to minimize the impact, thereby reducing the adverse effects on other drive systems. The logic can minimize the impact while minimizing it into two parts.

4WD, Tip In, Tip Out, Shock, Drive System, Logic

Description

Method for controlling shocks of tip-in and tip-out in 4WD system of vehicle}

The present invention relates to a tip-in and tip-out impact control method for a four-wheel drive system of a vehicle, and more particularly, logic for minimizing the impact at tip-in and tip-out generated by a four-wheel drive system mounted on passenger cars and SUV vehicles. It relates to a tip-in and tip-out impact control method of a four-wheel drive system of a vehicle.

In general, the four-wheel drive system of the vehicle is mainly used to mount the SUV or Jeep vehicle to enable the rough road driving, such as on the bumpy dirt road.

However, in recent years, in order to improve the driving performance of luxury passenger cars, the above-mentioned four-wheel drive system has been mounted, and he continues to expand.

As described above, when the four bacterial drive system is installed in the vehicle, the driving performance of the vehicle is improved, while the number of gears that must pass from the engine to the tire, which is the final part of the driving system, increases, resulting in the tip-in and tip-out of the drive system. There was a problem that the impact doubled.

Therefore, when developing a vehicle equipped with a four-wheel drive system, care must be taken not to impair the commerciality of the tip-in and tip-out shocks of the drive system. filter) is being applied.

However, the strong pedal filter can reduce the impact, but can seriously deteriorate the acceleration performance of the vehicle, and the soft pedal filter is insufficient to reduce the shock, there is a limit that the acceleration performance is not deteriorated while reducing the impact.

Therefore, there will be a need for a method that can be overcome while minimizing the problems newly generated due to the above limitations.

An object of the present invention for solving the above problems, by implementing the logic to control the engine torque to minimize the impact at the tip-in and tip-out of the four-wheel drive system and thereby minimize the impact while minimizing other side effects The present invention provides a method of controlling tip-in and tip-out impact in a four-wheel drive system of a vehicle implementing logic.

Tip-in and tip of the four-wheel drive system of the vehicle by logic to minimize the impact generated during tip-in and tip-out according to an embodiment of the present invention for achieving the object as described above The out shock control method controls a control condition consisting of a plurality of environmental variables such that logic for optimizing the shock is operated, and positive torque is applied to the drive system to minimize the shock. It is characterized by controlling the engine torque (engine torque) to be caught.

According to an embodiment of the present invention, in the control operating condition, the logic limits the coolant temperature so that the engine does not operate before the cooling warm-up and the engine operates after the warm-up, and the logic controls the pedal position (pedal). limit the pedal position so that it is not activated when the position is greater than 0%, limit the idle condition so that the logic does not work when the vehicle is stopped, and the logic operates under certain driving road slope conditions. Limiting the inclination of the driving road, limiting the speed of the vehicle to operate the logic only in a predetermined speed range, and limiting external control operation conditions by an additional input for an additional limiting situation.

According to an embodiment of the present invention, the control operation conditions are connected to an and condition so that the operation of the logic is turned on.

According to an embodiment of the present invention, the control of the engine torque to maintain the positive torque includes a first look-up table for calculating the main delta rotational speed of the engine rotational speed and the turbine rotational speed of the auto transmission. table), gear ratio and engine speed are used as input variables, and the delta rotation speed required by the gear ratio and engine speed is calculated as output variables, and a second lookup table is calculated for trim delta speed. The coolant temperature and the engine rotational speed are used as input variables, and the trim value of the delta rotational speed required by the coolant temperature and the engine rotational speed is calculated as the output variable, and calculated from the first and second lookup tables. When the delta speed of the final required value is calculated according to the calculated value, the actual engine speed and turbine speed can be obtained through the PID controller. The delta of the rotation speed to meet the demand value and determines the PID values obtained.

Through the tip-in and tip-out impact control method of the four-wheel drive system of the vehicle according to the present invention as described above, it is possible to implement a logic that can minimize the impact while minimizing side effects on other drive systems of the vehicle.

Hereinafter, a preferred embodiment of a tip-in and tip-out impact control method of a four-wheel drive system of a vehicle according to the present invention will be described with reference to the accompanying drawings.

1 is a schematic view showing the main logic of the tip-in and tip-out impact control method of the four-wheel drive system of the vehicle according to the present invention, Figure 2 is a tip-in and tip-out impact control method of the four-wheel drive system of the vehicle according to the present invention Figure 3 is a schematic diagram showing the control operation conditions, Figure 3 is a schematic diagram showing the control of the engine torque in the tip-in and tip-out impact control method of the four-wheel drive system of the vehicle according to the present invention.

As shown in the figure, in the present invention, the logic for minimizing the impact generated during tip-in and tip-out of the four-wheel drive system can be divided into two parts, the first of which is It consists of optimizing the controllable conditions for the logic to work and properly controlling the actual engine torque to minimize the second impact.

And, in the tip-in and tip-out impact control method of the four-wheel drive system, as shown in Figure 1, the control operation conditions through the six input variables described below to enable the operation of the logic on / off This is entered as true / false, and automatic calculation of gear ratio, engine speed and auto transmission is necessary for calculating the desired torque to minimize impact. Four parameters are input: the turbine's turbine speed and the engine's coolant temperature.

First, a number of, preferably six, environmental variables, namely 1) coolant temperature, 2) pedal position, 3) idle, such that the logic for optimizing the impact as described above is turned on / off. Looking at the input conditions of an enable condition that can be operated only when all conditions are satisfied by inputting an idle condition, 4) driving road slope, 5) vehicle speed, and 6) external control operation conditions. As follows.

1) In the coolant temperature condition, when the engine of the vehicle is in a cool state, the engine control condition is unstable and all conditions are unstable. Therefore, the logic should not be operated as much as possible. It is advisable to limit the coolant temperature so that it does not operate before) and operates after warming up the engine.

2) Under the pedal position condition, the logic should not work if the pedal exceeds 0% since the driver is stepping on the pedal for engine torque and therefore is not related to the impact, therefore, the logic should be pedal position. It is desirable to limit the pedal position so that it is not activated when is greater than 0%.

3) In the idling condition, the logic should not be operated in the idling condition because the cause of the impact has already disappeared when the vehicle is stopped. Therefore, it is desirable to limit the idle conditions so that the logic does not operate when the vehicle is stopped.

4) Since the impact is related to the inclination of the driving road, the engine brake is important at the downhill, and abnormal phenomenon may occur even at the uphill, so that the logic should not operate under a certain inclination condition. Therefore, it is preferable to limit the inclination of the driving road so that the logic does not operate in a predetermined driving road inclination condition.

5) Since the impact at the tip-in and tip-out is related to the vehicle speed, the logic should operate only in a certain speed range. Therefore, to optimize the impact it is desirable to limit the vehicle speed so that the logic operates only in a certain speed range.

6) If there is a situation that requires additional restriction in addition to the operating conditions limited by the above five environmental variables, a false may be input so that the logic does not operate under the conditions. That is, it is preferable to limit the external control operation condition so that the logic is not operated by inputting false in an additional restriction situation.

Here, in order for the operation of the logic to be turned on, the control operation conditions, as shown in Figure 2, to be connected to the (and) condition.

Next, the engine torque is controlled so that a positive torque is always applied to the entire driveline in order to effectively eliminate the tip-in and tip-out shocks of the four-wheel drive system to minimize the impact.

However, if the amount of torque is too large, safety problems may occur, so it is desirable to keep it minimized.

In order to keep the positive torque to a minimum, as shown in FIG. 3, two look-up tables and one PID controller are required.

The first lookup table of the two lookup tables is used for calculating the main delta rotational speed of the engine rotational speed and the turbine rotational speed of the auto transmission. At this time, the input variable is the gear ratio and the engine rotational speed, and the output variable is the delta rotational speed required by the two variables, the gear ratio and the engine rotational speed.

The second lookup table is used for trim delta rotational speed calculation. At this time, the input variables are the coolant temperature and the engine speed, and the output variables are the trim values of the delta rotation speed required by the two variables, the coolant temperature and the engine speed.

When the delta rotation speed of the final required value is calculated by multiplying the values calculated in the first and second lookup tables, the Piadi controller PIDs the actual engine rotation speed and the delta rotation speed of the turbine speed to meet the required value. Determine the acquisition value

Through the above process it is possible to minimize the tip-in and tip-out impact of the four-wheel drive system as shown in FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the scope of the appended claims. It will be understood by those skilled in the art that various modifications may be made and equivalents may be resorted to without departing from the scope of the appended claims.

1 is a schematic diagram showing the main logic of the tip-in and tip-out impact control method of a four-wheel drive system of a vehicle according to the present invention.

Figure 2 is a schematic diagram showing the control operation conditions in the tip-in and tip-out impact control method of the four-wheel drive system of the vehicle according to the present invention.

3 is a schematic view showing control of engine torque in a tip-in and tip-out impact control method of a four-wheel drive system of a vehicle according to the present invention;

Claims

To control the control condition (enable condition) consisting of a number of environmental variables to operate the logic to optimize the impact,

Logic for minimizing shock generated during tip-in and tip-out by controlling engine torque to apply positive torque to the driveline to minimize shock In the tip-in and tip-out impact control method of the four-wheel drive system of the vehicle,

The control operation condition is,

The logic disables the coolant temperature of the engine and limits the coolant temperature to operate after the engine warms up,

The logic restricts the pedal position so that it is not activated when the pedal position exceeds 0%,

Limit idle conditions so that the logic does not work when the vehicle is stopped,

In certain driving road inclination conditions, the driving road inclination is limited so that the logic does not operate.

Limit the vehicle speed so that the logic operates only in a certain speed range,

Tip in and tip out impact control method of a four-wheel drive system, characterized in that by limiting the external control operating conditions such that the logic is not activated by inputting a false in an additional limiting situation.

delete

The method of claim 1, wherein the control operating conditions are connected to an end condition so that the operation of the logic is turned on.

The method of claim 1, wherein the control of the engine torque to maintain the positive torque,

The first look-up table is used for calculating the main delta rotational speed of the engine rotational speed and the turbine transmission speed of the auto transmission, wherein the gear ratio and the engine rotational speed are used as input variables and the gear ratio as the output variable. And the delta rotation speed required by the engine rotation speed is calculated,

The second lookup table is used to calculate the trim delta rotation speed, wherein the coolant temperature and the engine rotational speed are used as input variables, and the trim value of the delta rotational speed required by the coolant temperature and the engine rotational speed as the output variables. Is calculated,

When the delta rotational speed of the final required value is calculated according to the values calculated in the first and second lookup tables, the actual engine rotational speed and the delta rotational speed of the turbine speed are adjusted to the required value through a PID controller. Tip-in and tip-out impact control method for a four-wheel drive system, characterized in that to determine the PID acquisition value to meet.