KR20170064055A - Control method of engine torque for vehicle and control system for the same - Google Patents

Abstract

The present invention relates to a method of controlling an engine torque of a vehicle and a control system thereof, the method comprising: a traveling condition measuring step of measuring an outside air pressure and an outside air temperature of the vehicle; A running resistance calculation step of calculating a current running resistance by using the outside air pressure and the outside air temperature measured in the traveling condition measuring step; And an engine torque compensating step of compensating an engine torque in accordance with the running resistance calculated by the control unit in the running resistance calculating step, and a control system therefor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control method for an engine torque of a vehicle,

The present invention relates to a method of controlling engine torque of a vehicle and a control system thereof, and more particularly, to a method and apparatus for controlling engine torque to realize a running performance of a vehicle in consideration of a running resistance which varies according to a running environment of the vehicle will be.

The vehicle travels under various driving conditions due to changes in the ground state or weather conditions during driving. Such changes in the driving conditions of the vehicle have various effects on the driving performance of the vehicle such as the output of the engine and the acceleration performance of the vehicle.

As described above, it is very important to understand the driving conditions that can affect the driving performance in various ways so as to prevent the driving performance of the vehicle from undergoing abrupt changes and to realize the consistent driving performance.

Particularly, due to changes in running resistance such as air resistance or rolling resistance, different power performance is manifested even under the same engine output control, which deteriorates the acceleration performance of the vehicle and may reduce the feeling of running felt by the driver. It is especially important to detect and respond.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2013-0054052 A1

SUMMARY OF THE INVENTION An object of the present invention is to realize an efficient running performance of a vehicle by effectively compensating engine torque according to a change in running resistance of the vehicle.

According to another aspect of the present invention, there is provided a method of controlling an engine torque of a vehicle, the method comprising: measuring a running condition for measuring an outside air pressure and an outside air temperature of the vehicle; A driving resistance calculation step of calculating a current driving resistance by using the outside air pressure and the outside air temperature measured in the driving condition measuring step; And an engine torque compensating step of compensating the engine torque according to the running resistance calculated by the control part in the running resistance calculating step.

In the driving resistance calculation step, the control unit can determine the air resistance and the rolling resistance to calculate the running resistance.

In the driving resistance calculation step, the control unit calculates the air density value through the outside air temperature and the outside air pressure measured in the driving condition measuring step, and determines the current air resistance using the air density value.

In the driving resistance calculation step, the controller can determine the current rolling resistance through the outside air temperature and the outside air pressure measured in the driving condition measuring step.

In the engine torque compensation step, the control unit compares the running resistance calculated in the running resistance calculating step with the reference resistance, and compensates the engine torque corresponding to the variation.

In the engine torque compensation step, the control unit can compensate the engine torque by adjusting the amount of air flowing into the engine.

In the engine torque compensation step, the control unit controls the throttle valve provided in the intake manifold of the engine to adjust the amount of air flowing into the engine.

According to another aspect of the present invention, there is provided an engine torque control system for a vehicle, including: a sensor unit for measuring an outside air pressure and an outside air temperature of the vehicle; And a control unit configured to calculate a current running resistance using the outside air pressure and the outside air temperature of the vehicle measured by the sensor unit and to compensate the engine torque according to the calculated running resistance.

According to the engine torque control method and the control system for a vehicle as described above, it is possible to realize a driving performance of a consistent vehicle effectively by compensating engine torque according to a change in running resistance of the vehicle.

Particularly, by measuring the running resistance of the vehicle using the outside air pressure and the outside air temperature of the vehicle and compensating the output of the engine, it is possible to consistently control the running performance of the engine which changes according to the running condition, .

Further, in order to calculate the running resistance, the air resistance and the rolling resistance according to the running conditions are determined, and the running resistance which may affect the running of the vehicle can be calculated more accurately, thereby increasing the reliability of the torque compensation of the engine.

On the other hand, the torque control of the engine is made by compensating the amount of the air flowing into the engine, so that the compensation of the engine torque can be simply and effectively performed. The compensation of the air amount of the engine is performed by controlling the throttle valve located on the intake manifold The amount of air flowing into the engine can be effectively compensated.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a procedure of a method for controlling engine torque of a vehicle according to an embodiment of the present invention. Fig.
2 shows an engine torque control system for a vehicle according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The method for controlling engine torque of a vehicle according to the present invention may further include: a traveling condition measuring step (S100) for measuring an outside air pressure and an outside air temperature of the vehicle, as shown in Figs. A running resistance calculation step (S200) in which the control unit (200) calculates the current running resistance using the outside air pressure and the outside air temperature measured in the running condition measurement step (S100); And an engine torque compensation step (S300) of compensating engine torque according to the running resistance calculated by the control part 200 in the running resistance calculation step (S200).

Specifically, in the driving condition measuring step (S100), the outside air pressure and the outside air temperature of the vehicle are measured. The outside air pressure and the outside air temperature of the vehicle can utilize the air pressure and temperature sensor 120 attached to the vehicle.

The running resistance, which restricts the driving performance of the engine 140, such as the acceleration performance in the running of the vehicle, is particularly affected by the outside air pressure at the time of running and the outside air temperature. Therefore, in the traveling condition measuring step (S100), the traveling conditions including the outside air pressure and the outside air temperature are measured.

On the other hand, in the driving resistance calculating step S200, the controller 200 calculates the current running resistance by using the outside air pressure and the outside air temperature measured in the traveling condition measuring step S100. The running resistance refers to a resistance component acting on a vehicle when the vehicle is running.

The driving resistance can affect various driving performance such as the driving speed maintaining ability, the acceleration performance, or the steering ability of the vehicle. Especially, when the driving resistance is strong, the vehicle exhibits lower power performance even in the same control environment.

Therefore, the external pressure and the outside temperature of the vehicle, which directly affect the running resistance, are measured in the driving condition measuring step (S100), and the running resistance of the current vehicle is calculated using the measurement. At this time, the running resistance can be directly calculated using the calculation formula in the control unit 200, or the running resistance corresponding to the current outside pressure and the outside temperature can be determined according to the running resistance determination map previously input.

On the other hand, in the engine torque compensation step S300, the engine torque is compensated in accordance with the running resistance calculated by the controller 200 in the running resistance calculating step S200.

Specifically, if the running resistance is increased, the engine torque demand amount for increasing or maintaining the running speed may increase even under the same engine 140 control condition. It is necessary to improve the output of the engine 140 to cope with the increase in the running resistance.

Therefore, in the running resistance calculation step (S200), the running resistance of the current vehicle is measured, and the engine torque is controlled to rise by the increase of the running resistance.

The above-described engine torque compensation enables the same power performance of the vehicle to be manifested even when the running resistance of the vehicle changes. By preventing the running performance of the vehicle from changing in accordance with the running condition, it is possible to improve the driver's feeling of running, It is advantageous to increase the accuracy of the control system.

1 and 2, in the engine torque control method of a vehicle according to the embodiment of the present invention, in the driving resistance calculation step S200, the controller 200 determines the air resistance and the rolling resistance, Calculate the resistance.

There are various components in the running resistance. Among them, air resistance and rolling resistance affect the driving performance. Air force is the effect of the air force that is applied when an object exposed in the air moves, and in particular, the air force acting in the opposite direction to the traveling direction of the running vehicle is called the air resistance.

Rolling resistance is a sum of the resistance that the wheel receives when the car rolls on a horizontal road surface, and consists of deformation of the tire, friction, and resistance transmitted from the road surface.

The air resistance and the rolling resistance largely influence the influence of the outside temperature and the outside air pressure. In the traveling condition measuring step (S100), the outside air temperature and the outside air pressure at the time of driving are measured, To calculate the running resistance, and to compensate the engine torque equivalent to the running resistance.

The air resistance and the rolling resistance are determined by the controller 200. The determination method includes a method of extracting a resistance value according to the current outside air pressure and the outside air temperature through a resistance map input in advance, The air resistance and the rolling resistance may be calculated.

As described above, by dividing the running resistance into the air resistance and the rolling resistance, determining the respective resistance values, and calculating the current vehicle running resistance by integrating these resistance values, it is possible to calculate the running resistance with higher accuracy and reliability .

As a result, this method is advantageous for realizing the consistent driving performance of the vehicle because it can improve the reliability and increase the effect of the engine torque compensation by the method of controlling the engine torque of the vehicle according to the present invention.

1 and 2, in the method for controlling the engine torque of the vehicle according to the embodiment of the present invention, in the traveling resistance calculation step S200, the outside air temperature and the outside air pressure measured in the traveling condition measurement step S100 The controller 200 calculates the air density value and determines the current air resistance using the air density value.

The air resistance is determined by the running speed, the cross-sectional area of the vehicle, and the air density. In the present invention, the air density value according to the outside air pressure and the outside air temperature during driving is directly calculated and the air resistance value is determined thereby, The value can be determined.

The method of calculating the air density may also be various, but the formula for calculating the air density by the controller 200 according to the embodiment of the present invention is as follows.

Where P is the air density value, P is the atmospheric pressure, Pv is the steam partial pressure, which means the saturation water vapor pressure at the current atmospheric temperature, T means atmospheric temperature, and the other constants are converted into mutually corresponding values This value is determined according to the unit of each variable.

The above equation means that the air density is calculated from the atmospheric pressure and the atmospheric temperature excluding the steam partial pressure, and the calculation formula for calculating the air density value in addition to the above calculation formula can be determined in various forms. to be.

In the above calculation equation, the Pv value is a value determined especially by the atmospheric temperature, and its determination formula is as follows.

Where Pv is the steam partial pressure, which means the saturation water vapor pressure at the current atmospheric temperature, and T means atmospheric temperature. Each constant is a constant required for each variable to be converted to a pressure value according to its order. It is obvious to those skilled in the art that the calculation formula of the steam partial pressure can be variously existed in addition to the above-mentioned form.

In the case of the present invention, since the steam partial pressure is calculated according to the above equation, the air density is determined by the outside air pressure and the outside air temperature of the vehicle.

That is, in the present invention, the control unit 200 calculates the air density according to the outside air pressure and the outside air temperature through the above equation and determines the air resistance by applying the air density to calculate the running resistance more accurately and reliably.

1 and 2, in the method for controlling the engine torque of the vehicle according to the embodiment of the present invention, in the traveling resistance calculation step S200, the outside air temperature and the outside air pressure measured in the traveling condition measurement step S100 The controller 200 determines the current rolling resistance.

The rolling resistance is influenced by the strain of the wheel, particularly with respect to the wheel and the outside air pressure. Accordingly, the rolling resistance is determined by the control unit 200 from the data map of the rolling resistance determined experimentally or theoretically according to the outside temperature and the outside pressure by the control unit 200 corresponding to the current outside temperature and the outside pressure, It can be directly calculated through the rolling resistance calculation formula.

As a result, in the present invention, the controller 200 can determine the rolling resistance according to the outside air pressure and the outside air temperature through the rolling resistance data map, thereby obtaining more accurate and reliable running resistance.

1 and 2, in the engine torque control method for a vehicle according to the embodiment of the present invention, in the engine torque compensation step (S300), the controller 200 calculates Compares the running resistance with the reference resistance, and compensates the engine torque corresponding to the variation.

Specifically, the control unit 200 is set in advance with a reference resistor serving as a reference for measuring the variation of the running resistance. In the present invention, the reference resistance is a running resistance determined under a general driving condition of the vehicle, and can be determined as an experimental or theoretical calculation result, and the outside air temperature and the outside air pressure at which the reference resistance is measured can also be varied.

When the current running resistance is higher than the reference resistance preset in the control unit 200, the power performance or the acceleration performance of the vehicle is lowered, so that the control unit 200 controls the engine 140 in the control process of the engine 140, Is increased. Similarly, when the current running resistance has a value lower than the reference resistance, the controller 200 may compensate the engine torque so that the engine torque is reduced.

The compensation amount of the engine torque according to the variation of the running resistance with respect to the reference resistance is determined experimentally or theoretically from a predetermined data map. That is, the control unit 200 determines the amount of compensation of the engine torque corresponding to the deviation value between the current running resistance and the reference resistance from the previously set data map, and determines whether or not the current engine torque is compensated by the compensation amount. .

1 and 2, in the engine torque control method for a vehicle according to the embodiment of the present invention, in the engine torque compensation step (S300), the control unit 200 controls the amount of air flowing into the engine 140 Thereby compensating the engine torque.

In the present invention, the torque of the engine 140 is compensated by the variation of the running resistance. Under the driving condition of the engine 140, the amount of the air that flows into the engine 140 and is burned increases, The engine torque is increased. Accordingly, in the embodiment of the present invention, the engine torque can be effectively compensated by adjusting the amount of air flowing into the engine 140.

1 and 2, in the engine torque control method for a vehicle according to the embodiment of the present invention, in the engine torque compensation step (S300), the control unit 200 is provided in the intake manifold of the engine 140 Throttle valve 145 to control the amount of air flowing into the engine 140.

As the amount of the air flowing into the engine 140 increases and the amount of combustion under the same condition increases as described above, the engine torque outputted from the engine 140 increases. The amount of air introduced into the engine 140 can be adjusted in various ways Lt; / RTI >

Particularly, the control of the throttle valve 145 that regulates the amount of air flow on the flow path of the intake manifold for supplying air to the engine 140 controls the flow rate of the air flowing into the engine 140 to compensate the engine torque .

That is, when compensation is made such that the running resistance is higher than the reference resistance and the engine torque is increased, the control unit 200 controls the throttle valve 145 to increase the opening amount of the flow path, Thereby increasing the air flow rate and consequently improving the engine torque.

Meanwhile, as shown in FIG. 2, the engine torque control system for a vehicle according to the present invention includes a sensor unit 120 for measuring an outside air pressure and an outside air temperature of the vehicle; And a control unit 200 for calculating a current running resistance by using the outside air pressure and the outside air temperature of the vehicle measured by the sensor unit 120 and compensating the engine torque according to the calculated running resistance.

Specifically, the sensor unit 120 measures the outside air pressure and the outside air temperature of the vehicle as a running condition of the vehicle. The control unit 200 is connected to the sensor unit 120 to calculate the current running resistance using the outside air temperature and the atmospheric pressure of the vehicle measured by the sensor unit 120.

The control unit 200 determines the compensation amount of the engine torque in accordance with the variation in the running resistance calculated as described above, and controls the engine 140 to compensate the engine torque so that the compensation amount can be reflected.

As a result, it is possible to calculate the current running resistance according to the change of the running condition of the vehicle, and to control the engine torque in accordance with the running resistance to realize a consistent performance or acceleration performance of the vehicle, thereby improving the running performance of the vehicle.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

S100: Running condition measuring step S200: Running resistance calculating step
S300: Engine torque compensation step 200:

Claims (8)

A driving condition measurement step of measuring the outside air pressure and the outside air temperature of the vehicle;
A running resistance calculation step of calculating a current running resistance by using the outside air pressure and the outside air temperature measured in the traveling condition measuring step; And
And an engine torque compensating step of compensating an engine torque according to the running resistance calculated by the control unit in the running resistance calculating step. The method according to claim 1,
Wherein the control unit calculates the running resistance by determining the air resistance and the rolling resistance in the running resistance calculating step. The method of claim 2,
Wherein the control unit calculates the air density value through the outside air temperature and the outside air pressure measured in the driving condition measuring step and determines the current air resistance using the air density value in the driving resistance calculating step Method for controlling engine torque. The method of claim 2,
Wherein the control unit determines the current rolling resistance through the outside air temperature and the outside air pressure measured in the driving condition measuring step in the driving resistance calculating step. The method according to claim 1,
In the engine torque compensation step, the control unit compares the running resistance calculated in the running resistance calculating step with the reference resistance, and compensates the engine torque corresponding to the variation. The method according to claim 1,
Wherein the control unit compensates the engine torque by adjusting an amount of air flowing into the engine in the engine torque compensation step. The method of claim 6,
Wherein the controller controls the throttle valve provided in the intake manifold of the engine to adjust the amount of air flowing into the engine in the engine torque compensation step. A sensor unit for measuring an outside air pressure and an outside air temperature of the vehicle; And
And a control unit configured to calculate a current running resistance by using the outside air pressure and the outside air temperature of the vehicle measured by the sensor unit and to compensate the engine torque according to the calculated running resistance.

Images