KR20040031255A - A device and the method for a engine idle-up controling of auto transmission in automobile - Google Patents

Abstract

PURPOSE: An increase control device of engine idle rpm for an automatic transmission in a vehicle and a method thereof are provided to improve shift quality and fuel efficiency by stabilizing hydraulic pressure of the transmission to the desired flow rate with detecting instability of hydraulic pressure from decrease of engine idle rpm or increase of oil temperature. CONSTITUTION: A position of a shift lever is detected by inputting vehicle state signals varied according to the state of a vehicle in starting an engine(S100,S110,S120). Satisfaction of increase condition for engine idle rpm is detected(S130). A transmission control unit detects the change of speed in satisfying the engine idle increase condition(S140), and sets engine rpm variables according to oil temperature at the D-range during creep traveling or stopping(S150,S160). The transmission control unit decides satisfaction of engine idle increase in detecting the N-range(S180), and sets engine rpm variables according to oil temperature at the N-range in satisfying engine idle increase condition(S190). The increase of engine rpm is corrected according to oil temperature by detecting change of vehicle speed.

Description

Engine idle speed increase control device and automatic method of vehicle automatic transmission {A DEVICE AND THE METHOD FOR A ENGINE IDLE-UP CONTROLING OF AUTO TRANSMISSION IN AUTOMOBILE}

The present invention relates to an automatic transmission for a vehicle, and more particularly, an engine idle speed increase control apparatus of an automatic transmission for a vehicle for relieving instability of transmission operation hydraulic pressure due to a decrease in engine speed during engine idle and an increase in an automatic transmission oil temperature. It's about how.

An automatic transmission for a vehicle is provided with a shift control device that automatically adjusts a transmission ratio according to a vehicle traveling speed and a load.

The shift control device performs a shift by controlling a plurality of clutches and brakes installed in the gear train in an activated or inoperative state to adjust the output rotation speed of the planetary gear device.

The automatic transmission that performs the shift as described above uses hydraulic clutches and brakes for transmission and conversion of power, and as with all hydraulic machines, the hydraulic system used in the automatic transmission can be decompressed appropriately depending on the purpose. Basic pressure is required.

In the automatic transmission, this basic pressure is called a line pressure, and the magnitude of the line pressure is determined to be a hydraulic pressure large enough so that no slip occurs in the power transmission clutch under any state in consideration of the maximum torque acting on the automatic transmission.

Thus, when the flow rate is pumped by the oil pump as shown in FIG. 1, a regulator valve connected to the output line of the oil pump controls the hydraulic pressure of the line.

In the above relationship, the pump flow rate is proportional to the engine rotational speed, and the pumping torque is proportional to the line pressure.

That is, since the engine rotation speed is a factor governed by the vehicle's behavior, automatic transmission side control is not possible, and only the pump torque by the regulator valve can be controlled.

Therefore, the transmission oil discharged from the oil pump in the automatic transmission valve body structure having the structure shown in FIG. 1 is affected by the pilot valve and acts on the control pressure valve on the right side.

At the balance point of the valve, Fpilot + F control pressure = Fspring + Fvfs pressure.

On the other hand, by adjusting the variable force solenoid (VFS) in the above formula, adjusting the control pressure to the clutch is a hydraulic closed circuit of an automatic transmission equipped with a general variable solenoid valve (VFS).

However, if the Fpilot pressure, which is influenced by the transmission oil flow rate discharged from the oil pump, is not constant in the above equation of force, even if a control pressure is applied in the same variable solenoid valve (VFS), the pressure that is actually regulated and exits to the clutch is the same variable solenoid. Under the valve (VFS) pressure condition, different results are inevitable, which completely loses control.

Therefore, for the stability of the control, the Fpilot must be constant, which should be sufficient amount of transmission oil to maintain the target pilot pressure. However, when the idle rotation speed of the engine considering fuel economy and NVH is lowered, or leakage occurs such as the discharge flow rate of the oil pump at a high temperature, the most basic pure line pressure is the lowest value for regulating the pilot pressure. Less than pressure occurs. In this case, there is a problem that the stability of the balance of the force is broken and the stability of the control is lost and control cannot be performed properly.

Therefore, the pressure acting on the actuating element made up of each brake and clutch is less than the target value or is transmitted in an unbalanced state, thereby causing a problem of squeezing or shift shock of the friction element.

Accordingly, an object of the present invention is devised to solve the above problems, the automatic transmission operation hydraulic pressure is detected by the idle engine rotation speed decrease or oil temperature rise in the vehicle automatic transmission vehicle, the transmission operation hydraulic pressure An engine idle speed control device and a method for an automatic transmission for a vehicle for raising idle engine speed so as to reach this stable target flow rate.

1 is a hydraulic partial circuit diagram of a general automatic transmission,

2 is a block diagram illustrating a configuration of an engine idle speed increase control apparatus for an automatic transmission for a vehicle according to an exemplary embodiment of the present invention;

3 is a flowchart illustrating a method of controlling an engine idle speed increase control method of an automatic transmission for a vehicle according to an exemplary embodiment of the present invention;

4 is a graph illustrating an application of engine speed to oil temperature when the engine idle speed of the vehicle automatic transmission increases according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: vehicle operation state detection device 110: throttle valve opening detection unit

120: engine speed detection unit 130: input shaft speed detection unit

140: output shaft rotation speed detection unit 150: oil temperature detection unit

160: shift lever position detection unit 200: engine control device

300: shift control device 400: drive device

410: engine drive unit 420: variable speed drive unit

The present invention for achieving the above object,

Vehicle operating state detection means for detecting a change in the operating state of the vehicle and the like which is varied according to the change in the operating state of the vehicle;

Engine control for inputting and outputting a predetermined control signal for controlling the operating state of the engine by receiving the throttle valve opening degree, engine speed, etc. detected and applied by the vehicle operating state detecting means, and inputting and outputting necessary data through can communication. Means;

The shift lever position is input by receiving the input shaft rotation speed, the output shaft rotation speed, the oil temperature, the shift lever position and the throttle valve opening degree and the engine rotation speed applied through the can communication from the engine control means. When the shift lever is in the 'N' or 'D' range, if the engine idle rising condition is satisfied, the vehicle speed change is determined and a control signal for correcting the engine speed increase according to the oil temperature change is output to the engine control means. Shift control means for outputting a shift control signal;

Drive means for shifting the shift stage to the target shift stage by synchronizing with the engine idle lift control signal output from the engine control means to increase the engine idle state and synchronizing with the shift control signal output from the shift control means. Characterized in that consists of.

Another invention for achieving the above object,

When the engine of the vehicle is started, determining a shift lever position by receiving a change signal of a vehicle operating state according to a change in a vehicle operating state;

Determining whether an engine idle speed increase condition is satisfied;

Determining the change in the vehicle speed characterized in that the step consisting of the correction of the engine speed in accordance with the change in oil temperature.

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

This example is not intended to limit the scope of the invention, but is merely presented as an example.

2 is a block diagram illustrating a configuration of an engine idle speed increase control apparatus for an automatic transmission for a vehicle according to an exemplary embodiment of the present invention, and FIG. 3 is a flowchart illustrating an operation method of a method for controlling engine idle speed increase of an automatic transmission for a vehicle according to an exemplary embodiment of the present invention. 4 is a graph showing the application of the engine speed to the engine temperature when the engine idle speed of the automatic transmission according to an embodiment of the present invention.

As shown in FIG. 2, the engine idle lift control apparatus for an automatic transmission for a vehicle according to an exemplary embodiment of the present invention detects a change in an operating state of a vehicle, which is varied according to a change in an operating state of a vehicle, as shown in FIG. 2. )Wow;

The throttle valve opening degree, engine speed, and the like detected and applied by the vehicle operation state detection device 100 are input to output a predetermined control signal for controlling the operation state of the engine, and input and output necessary data through ken communication. An engine control device 200;

The input shaft rotation speed, the output shaft rotation speed, the oil temperature, the shift lever position, and the throttle valve opening degree and engine rotation speed applied through the Ken communication from the engine control device 200 are outputted from the vehicle operation state detection device 100. After determining the shift lever position after receiving the input, when the engine idle rising condition is satisfied, the vehicle speed change is determined and a control signal for correcting the engine speed increase according to the oil temperature change is output to the engine control apparatus 200, and the shift control signal is output. A shift control device 300 for outputting;

The engine idle state is inputted to the engine idle lift control signal output from the engine control device 200 and is synchronized with the engine idle state, and the shift control signal output from the shift control device 300 is synchronized with the target gear shift stage. It consists of a driving device 400 to drive the shift.

The vehicle operation state detection device 100 includes a throttle valve opening degree detection unit 110 for detecting a change in the throttle valve opening degree which is changed in association with a driver's acceleration pedal operation state change;

An engine speed detector 120 which detects a change in engine speed that is changed according to a change in a vehicle operating state;

An input shaft rotation speed detection unit 130 for detecting a change in rotation speed of a transmission input shaft that is changed according to a change in an operation state of the vehicle;

An output shaft rotation speed detection unit 140 for detecting a change in rotation speed of a transmission output shaft that is changed according to a change in an operation state of the vehicle;

An oil temperature detection unit 150 for detecting a temperature change of the transmission oil that varies according to a change in an operation state of the vehicle;

The shift lever position detecting unit 160 detects a shift lever position change that is variable according to a driver's automatic transmission shift lever operation.

The driving device 400 includes an engine driver 410 for changing an operating state of the engine in synchronization with a control signal output from the engine control device 200;

A shift driver 420 shifts the shift stage to the target shift stage in synchronization with a control signal output from the shift control device 300.

An example of the control method of the engine idle speed increase control device for an automatic transmission for a vehicle having the above-described configuration will be described with reference to FIGS. 3 and 4.

When the engine is started, the vehicle operation state detecting apparatus 100 detects the throttle valve opening degree, the engine rotation speed, the input shaft rotation speed, the output shaft rotation speed, the oil temperature change, the shift lever position, etc., which are varied according to the vehicle operation state change (S100). ).

Accordingly, the engine control apparatus 200 receives a throttle valve opening degree and engine rotation speed detected and applied by the vehicle operation state detecting apparatus 100, and predetermined engine for controlling the change of the engine operating state by a set program. It outputs a rotation speed control signal, inputs and receives necessary data by can data communication, and controls the operation state of an engine.

In addition, the shift control apparatus 300 is input by the input shaft rotation speed, the output shaft rotation speed, the oil temperature change and the shift lever position detected by the vehicle operation state detection device 100 by the can data communication in the engine control device 200. The shift lever position is determined by receiving the change of the throttle valve opening degree and the engine speed (S110 and S120).

When it is determined that the shift lever position is the forward 'D' range position, the shift control apparatus 300 determines whether the engine idle rising condition is satisfied (S130).

The engine idle rising condition is determined to satisfy the engine idle rising condition when it is determined that the detected engine idle speed is equal to or less than the set speed or the oil temperature change temperature is higher than or equal to the set temperature.

Subsequently, when it is determined that the engine idle rising condition is satisfied, the shift control apparatus 300 determines a change in the vehicle speed (S140).

If it is determined that the vehicle speed is a vehicle creep driving state of more than 0Kph, the shift control apparatus 300 is a shift lever 'D' lane as shown in FIG. 4 to form a line pressure suitable for the automatic transmission creep driving state of the vehicle. Set the engine speed change value according to the oil temperature change in the condition (S150).

Thereafter, after comparing the set engine speed change value with the current engine speed value to calculate the difference, an engine idle control signal for raising the current engine speed to the set engine speed is output to the engine control device ( 200).

Accordingly, the engine control device 200 synchronizes with the engine idle lift control signal output from the shift control device 300 to output a fuel injection and ignition timing control signal for raising the current engine speed to the set engine speed. Output

However, in the step S140, when there is no traveling vehicle speed of the vehicle, the shift control apparatus 300 according to the oil temperature change in the shift lever 'D' lane condition as shown in FIG. 4 while the vehicle is not moving. The engine speed change value is set (S160).

Thereafter, after comparing the set engine speed change value with the current engine speed value to calculate the difference, an engine idle control signal for raising the current engine speed to the set engine speed is output to the engine control device ( 200).

Accordingly, the engine control device 200 synchronizes with the engine idle lift control signal output from the shift control device 300 to output a fuel injection and ignition timing control signal for raising the current engine speed to a set engine speed. Output

However, in S120, when the shift lever position is not the 'D' range according to the driver's manipulation change, it is determined whether the shift lever position is the 'N' range (S170).

In the above, when it is determined that the shift lever position is the 'N' range, the shift control apparatus 300 determines whether the engine idle rising condition is satisfied (S180).

The engine idle rising condition is determined to satisfy the engine idle rising condition when it is determined that the detected engine idle speed is equal to or less than the set speed or the oil temperature change temperature is higher than or equal to the set temperature.

Subsequently, when it is determined that the engine idle rising condition is satisfied, the shift control apparatus 300 sets the engine speed change value according to the oil temperature change in the shift lever 'N' lane condition as shown in FIG. 4 (S190). ).

Thereafter, after comparing the set engine speed change value with the current engine speed value to calculate the difference, an engine idle control signal for raising the current engine speed to the set engine speed is output to the engine control device ( 200).

Accordingly, the engine control device 200 synchronizes with the engine idle lift control signal output from the shift control device 300 to output a fuel injection and ignition timing control signal for raising the current engine speed to the set engine speed. Output

As a result, the engine speed during the neutral control of the shift stage can be lowered to a range that is not affected by the basic engine performance, thereby improving fuel economy.

In other words, in a neutral state where no hydraulic pressure is required on the automatic transmission side, the engine speed is lowered to the maximum, and the engine idle lift control is performed immediately before the forward 'D' range changeover to immediately secure the required hydraulic pressure on the transmission side. In this way, the fuel economy of the vehicle can be improved.

As described above, the present invention detects that the automatic transmission operating oil pressure becomes unstable due to the idle engine speed decrease or the oil temperature rise in the vehicle automatic transmission vehicle, and thus reaches the target flow rate at which the transmission hydraulic pressure can be stabilized. By increasing the idle engine speed, the automatic transmission control hydraulic stability can be secured, thereby improving the shift quality and improving fuel economy.

Claims (9)

When the engine of the vehicle is started, determining a shift lever position by receiving a change signal of a vehicle operating state according to a change in a vehicle operating state; Determining whether an engine idle speed increase condition is satisfied; The engine idle speed increase control method of the automatic transmission for a vehicle, characterized in that the vehicle speed change correction step of determining the vehicle speed change according to the oil temperature change. The method of claim 1, wherein the engine speed increase control according to the oil temperature change is performed only when the shift lever position is in the 'D' range or 'N' range. The method of claim 1, further comprising: determining a vehicle speed change when the engine idle lift condition is satisfied when the shift lever position is the 'D' range; If it is determined in the step that the vehicle creep driving state of the vehicle speed is more than 0Kph, the engine idle of the automatic transmission for a vehicle comprising the step of setting the engine speed change value corresponding to the creep driving state in accordance with the oil temperature change in the shift lever 'D' lane conditions Speed rise control method. The engine idle speed of the automatic transmission for a vehicle according to claim 3, further comprising setting an engine speed change value according to the oil temperature change in the shift lever 'D' lane condition when the vehicle speed is 0 Kph. Lift control method. The method of claim 1, further comprising: setting an engine speed change value according to the oil temperature in the shift lever 'N' lane condition when the engine idle rising condition is satisfied when the shift lever position is 'N' range; Calculating the difference by comparing the engine speed change value set in the step with a current engine speed value; And outputting, to the engine control means, an engine idle lift control signal for raising the current engine speed to the set engine speed according to the difference calculated in the step. The engine idling condition according to any one of claims 3 to 5, wherein the engine idling rising condition is determined to satisfy the engine idling condition if it is determined that the detected engine idling speed is less than or equal to the set rotational speed or the oil temperature change temperature is greater than or equal to the set temperature. The engine idle speed increase control method of the vehicle automatic transmission further comprising. Vehicle operating state detection means for detecting a change in the operating state of the vehicle and the like which is varied according to the change in the operating state of the vehicle; Engine control for inputting and outputting a predetermined control signal for controlling the operating state of the engine by receiving the throttle valve opening degree, engine speed, etc. detected and applied by the vehicle operating state detecting means, and inputting and outputting necessary data through can communication. Means; The shift lever position is input by receiving the input shaft rotation speed, the output shaft rotation speed, the oil temperature, the shift lever position and the throttle valve opening degree and the engine rotation speed applied through the can communication from the engine control means. When the shift lever is in the 'N' or 'D' range, if the engine idle rising condition is satisfied, the vehicle speed change is determined and a control signal for correcting the engine speed increase according to the oil temperature change is output to the engine control means. Shift control means for outputting a shift control signal; Drive means for shifting the shift stage to the target shift stage by synchronizing with the engine idle lift control signal output from the engine control means to increase the engine idle state and synchronizing with the shift control signal output from the shift control means. Engine idle rotation speed control device of an automatic transmission for a vehicle, characterized in that consisting of. 8. The apparatus of claim 7, wherein the vehicle operating state detecting means comprises: a throttle valve opening degree detecting unit configured to detect a change in the throttle valve opening degree which changes in association with a change in an accelerator pedal operation state of a driver; An engine speed detector for detecting a change in engine speed that varies according to a vehicle operating state change; An input shaft rotation speed detection unit configured to detect a change in rotation speed of a transmission input shaft that is changed according to a change in an operation state of the vehicle; An output shaft rotation speed detection unit for detecting a change in rotation speed of a transmission output shaft that is changed according to a change in an operation state of the vehicle; An oil temperature detection unit for detecting a temperature change of the transmission oil that varies according to a change in an operation state of the vehicle; An engine idle speed increase control apparatus for an automatic transmission for a vehicle including a shift lever position detecting unit configured to detect a shift lever position change that is changed according to a driver's automatic transmission shift lever operation. 8. An engine driving apparatus according to claim 7, wherein the driving means comprises: an engine driving unit for changing an operating state of the engine in synchronization with a control signal output from the engine control means; An engine idle speed increase control apparatus for an automatic transmission for a vehicle comprising a shift drive unit configured to shift the shift stage to a target shift stage in synchronization with a control signal output from the shift control means.