KR100290370B1 - Method for controlling speed change of automatic transmission - Google Patents

Abstract

PURPOSE: A shift control method of an automatic transmission is provided to increase fuel efficiency, and to reduce exhaust gas by varying the opening degree of a throttle valve and speed ranges according to the road condition during traveling. CONSTITUTION: The speed of a vehicle is input to an autocruise setting unit, and compared with the predetermined value by detecting RPM(Revolution Per Minute) of an output shaft corresponding to vehicle speed(S100,S110). Difference between the predetermined vehicle speed and the present speed is calculated(S120), and the opening degree of the throttle valve is set according to errors by the control unit(S130). The control unit estimates fuel efficiency and displacement by calculating with detecting the throttle valve opening degree, the present speed range and the engine RPM(S140). The control unit compares the calculated value with the estimated value of fuel efficiency and displacement by calculating the throttle valve opening degree after shifting(S160). The control unit outputs the control signal to the driving unit, a shift driving unit and a throttle actuator(S170). Fuel efficiency and displacement are optimized with selecting the traveling state by detecting the throttle valve opening degree.

Description

Shift control method of automatic transmission

The present invention relates to a shift control method of an automatic transmission, and more particularly, the vehicle having the automatic transmission is changed in accordance with fuel consumption and displacement by varying the opening amount and the shift stage of the throttle valve according to the driving state so as to allow optimum driving. It relates to a shift control method of an automatic transmission.

In general, a vehicle equipped with an automatic transmission controls the hydraulic pressure within the shift range set according to the traveling speed so that the shift gear of the target shift stage can be automatically operated.

Therefore, the torque converter is operated according to the output power of the engine to control the rotational force of the fluid, and the hydraulic pressure acts on the corresponding valve according to the control signal applied from the shift controller so that the shift gear according to the operating state of the vehicle can be operated. The shift operation may be made.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure does not require the operation of a clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. In this case, the engine stall is not generated due to the driver's malfunction or inexperienced driving while driving, so that even a beginner can easily operate the driving.

Therefore, the automatic transmission receives a fluid pressure from the oil pump by changing the port according to the selected position of the driver's shift lever, and the operating state of the hydraulic valve is changed by the fluid pressure so that any one of the gear stages of the transmission gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element for selecting stages.

According to the selective operation of the friction element, which consists of a clutch or brake, the operation of the planetary gear device is switched so that an appropriate transmission ratio is made and then transmitted to the drive gear.

When the shifted power is transmitted to the drive gear, the shifted power is transmitted to the driven gear gradually coupled to the subordinate gear by the driven gear gradually coupled to the drive gear, thereby controlling the rotational movement of the wheel.

As described above, the target shift stage is determined according to the driving state of the vehicle, and when the control operation to the determined target shift stage is executed, the corresponding friction element is operated for each target shift stage among friction elements consisting of a clutch or a brake. Let's do it.

In order to facilitate the driver's driving convenience in a vehicle equipped with the automatic transmission operating as described above, the opening amount of the throttle valve is variable by a separate control device for controlling the constant speed driving of the vehicle to control the output of the engine.

However, according to the related art, when a vehicle equipped with an automatic transmission has an uphill and a downhill where the driving road is not flat, the constant speed desired by the driver is not output, and the vehicle speed set by the driver is In order to maintain the excessive opening of the throttle opening and the resulting lower fuel economy and there is a problem of poor exhaust conditions.

Accordingly, an object of the present invention is to evaluate the state of fuel consumption and displacement by varying the opening amount and the shift stage of the throttle valve according to the state of the driving road, without requiring a separate constant speed driving control device when driving the vehicle. The purpose of the displacement is to select and drive the most ideal driving conditions.

According to the present invention for achieving the above object, when the vehicle starts to travel and the vehicle speed is at a constant vehicle speed, the driver sets the constant speed vehicle speed No1 by the constant speed driving setting unit to output the rotation speed corresponding to the current vehicle speed. Reading (No2) to determine whether the driver is equal to the vehicle speed (No1) set by the driver; If the constant speed vehicle speed No1 set by the driver is not equal to the current main vehicle speed No2, the constant speed vehicle speed No1 and the current driving vehicle speed No2 set by the driver are calculated by a set arithmetic expression. Calculating c); Setting a throttle valve opening amount Th in a memory map according to a difference value (Error) calculated by the constant speed (No1) and the current driving speed (No2) set by the driver; (X1) evaluating (X1) the state of fuel consumption and displacement by reading the opening amount Th of the set throttle valve, the current shift stage, and the engine RPM Ne by calculating by an arithmetic formula; Calculating and calculating the throttle opening amount Th for maintaining the current vehicle speed after shifting the current shift stage to the adjacent shift stage, and evaluating (X2) the state of fuel economy and displacement accordingly; The throttle opening amount Th is calculated to maintain the current vehicle speed after shifting the shift stage to the adjacent shift stage than the value calculated by the current throttle and the shift stage and the RPM (Ne) of the engine and evaluated (X1). Determining whether the value of the fuel economy and the displacement amount (X2) is effective for the driving state; And outputting a corresponding control signal for driving at the current throttle and the shift stage, when the fuel efficiency and the displacement are more efficient in the driving state than the value of the evaluation (X2).

1 is a block diagram of a shift control apparatus of a conventional automatic transmission.

2 is a block diagram of a shift control apparatus of an automatic transmission according to the present invention.

3 is a flowchart of a shift control method of an automatic transmission according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention, which can be achieved and realized in detail by the above objects, will be described in detail with reference to the accompanying drawings.

As shown in the accompanying FIG. 2, a vehicle control state detecting means for outputting a corresponding electric signal by receiving a signal that is variable and output according to a driving state of a vehicle as a shift control arch block of the automatic transmission according to the present invention (10). )and; In response to the signal output from the vehicle driving state detecting means 10, the difference value between the current vehicle speed and the driver's set vehicle speed during constant driving is calculated to calculate the opening amount of the corresponding throttle valve, and the calculated throttle valve Opening of the throttle valve to maintain the current vehicle speed by evaluating fuel economy and displacement according to the opening amount, the current shift stage, and the engine RPM (Ne) value, moving the shift stage to the adjacent transmission stage, and calculating the new throttle opening amount. Control means (20) for calculating the quantity of quantity, evaluating fuel economy and displacement, and setting a condition of an ideal state after comparing the evaluated fuel economy and displacement to output a corresponding throttle opening degree and a shift control signal; Receives a signal output from the control means 20 is composed of a drive means 30 for synchronizing the throttle opening degree and the shift stage to the target throttle opening degree and the target speed change stage.

The vehicle driving state detecting means 10 includes: a throttle valve opening degree detecting unit 11 for detecting an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of an accelerator pedal and outputting a corresponding signal; An output shaft rotation speed detection unit 12 that detects the rotation speed of the output shaft and outputs a corresponding signal as a signal corresponding to the vehicle speed of the vehicle; A shift lever sensing unit 13 for changing a position according to a shift lever operating state of the driver and outputting a corresponding signal; A brake operation switch 14 for outputting an on / off signal in accordance with a driver's brake pedal operation state; A constant speed traveling setting unit 15 outputting a corresponding setting signal when a constant speed traveling speed is set according to a driver's switch operation state; The engine speed detection unit 16 detects the rotational speed of the crankshaft which is variable according to the operating state of the engine and outputs a corresponding signal.

The driving means (30) includes a shift driver (31) for synchronizing the shift stage to the target shift stage by the shift control signal output from the control means (20); The throttle actuator 32 is configured to control the throttle opening degree to the target throttle opening degree according to the throttle opening degree control signal output from the control means 20.

Subsequently, when the vehicle starts to drive and the vehicle speed reaches a certain vehicle speed, the driver sets and inputs the constant speed vehicle speed No1 by the constant speed traveling setting unit 15, and the control means 20 rotates the output shaft corresponding to the current vehicle speed. The number No2 is read to judge whether or not the same as the vehicle speed No1 set by the driver (S100 and S110).

In the case where the constant speed vehicle No1 set by the driver and the current driving vehicle speed No2 are not the same, the control means 20 sets the constant speed vehicle No1 and the current driving vehicle speed No2 set by the driver by an arithmetic expression. The operation calculates a difference value (Error) (S120).

Error = Driver Setting Vehicle Speed (No1)-Current Driving Vehicle Speed (No2)

The control means 20 sets the throttle valve opening amount Th in the memory map according to the difference value Error calculated by the constant vehicle speed No1 and the current driving vehicle speed No2 set by the driver ( S130).

Therefore, the control peripheral stage 20 reads the opening amount Th of the set throttle valve, the current shift stage, and the engine RPM Ne, and calculates the state of the fuel consumption 돠 displacement by calculating by the set arithmetic equation (X1). (S140).

In addition, the control unit 20 calculates and calculates the throttle opening amount Th for maintaining the current vehicle speed after shifting the shift stage to the adjacent shift stage, and evaluates the state of the other fuel consumption and the displacement amount (X2) (S150). .

Therefore, the control means 20 is a throttle opening for maintaining the current vehicle speed after shifting the shift stage to the adjacent shift stage than the value calculated and evaluated by the current throttle and the shift stage and the RPM (Ne) of the engine. It is determined whether the value obtained by evaluating fuel economy and displacement (X2) by calculating the quantity Th is effective for the driving state (S160).

The value calculated by the current throttle, the gear shift stage, and the RPM (Ne) of the engine is evaluated (X1) to calculate the throttle opening amount (Th) for maintaining the current vehicle speed after shifting the gear shift stage to the adjacent gear stage. And when the displacement is more efficient in the driving state than the estimated value (X2), the control means 20 transmits a corresponding control signal for traveling to the current throttle and shift stage, and the shift drive part 31 and the throttle of the drive means 30. It outputs to the actuator 32 (S170).

However, the throttle opening amount Th is calculated to maintain the current vehicle speed after shifting the shift stage to the adjacent shift stage than the value calculated and evaluated by the current throttle, the shift stage, and the RPM (Ne) of the engine. If the value of the fuel economy and the displacement value (X2) is not efficient in the driving state, the control means 20 corrects the throttle opening degree and sets the corrected new throttle opening degree and the new speed change stage to meet the driving road condition. The corresponding throttle correction signal and the shift synchronizing signal are output to the shift drive unit 31 and the throttle actuator 32 of the drive means 30 or only the throttle opening degree is corrected so that only the new throttle opening control signal is selected from the throttle actuator of the drive means 30. 32) (S161).

On the other hand, when the vehicle speed No1 set by the driver in step S110 and the current traveling vehicle speed No2 of the vehicle are the same, the control means 20 drives the corresponding control signal for driving to the current throttle and the shift stage. It outputs to the transmission drive part 31 and the throttle actuator 32 of 30 (S170).

The above embodiments are described as the most preferred embodiments, and the present invention is not limited thereto, and the embodiments can be easily described from the above embodiments.

As described above, the present invention sets the throttle opening degree according to the vehicle speed deviation during driving and evaluates fuel economy and displacement according to the current shift stage and the engine speed, and maintains the current vehicle speed after moving to the adjacent transmission stage with respect to the estimated fuel economy and displacement. By calculating a new throttle opening amount and evaluating the state of fuel economy and exhaust volume when driving, the fuel economy and exhaust volume conditions are optimally selected without the need for a separate constant speed control device by selecting a driving condition that is most suitable for the state of fuel economy and exhaust volume. It will provide an effect that can be kept in a state.

Claims (2)

When the vehicle speed reaches a predetermined vehicle speed when the vehicle is running, determining whether or not the output shaft speed No2 corresponding to the current vehicle speed is the same as the vehicle speed No1 that has been set and input according to the setting input of the constant speed vehicle speed No1; Calculating a difference value by calculating the set constant speed vehicle No1 and the current driving vehicle speed No2 when the constant speed vehicle No1 and the current traveling vehicle speed No2 set in the above steps are not the same; Setting the throttle valve opening amount Th in the memory map according to the difference value Error calculated by the set constant speed vehicle No1 and the current traveling vehicle speed No2; Reading and calculating the opening amount Th of the set throttle valve, the current shift stage, and the engine RPM Ne, and evaluating (X1) states of fuel consumption and displacement; In the state of evaluating the state of fuel economy and displacement (X1), after shifting the shift stage to the adjacent shift stage, the throttle opening amount Th for calculating the current vehicle speed is calculated and calculated, and the state of fuel economy and displacement is evaluated accordingly. (X2); In this step, the throttle opening amount Th is calculated to maintain the current vehicle speed after shifting the shift stage to the adjacent shift stage than the value calculated and evaluated by the current throttle and the shift stage and the RPM (Ne) of the engine. Determining whether the value of the fuel economy and the displacement amount (X2) is effective for the driving state; In this step, the value calculated by the current throttle, the gear shift stage, and the RPM (Ne) of the engine is evaluated (X1). Evaluating fuel efficiency and displacement (outputting a corresponding control signal for driving at the current throttle and the shift stage, if it is more efficient for the driving condition than the value X2; at this stage, the current throttle, the shift stage, and RPM of the engine (Ne After calculating the throttle opening amount (Th) to maintain the current vehicle speed after shifting the shift stage to the adjacent shift stage than the value calculated by () and evaluating (X1), And if it is not efficient, correcting the throttle opening degree, setting a new throttle opening degree and a shift stage, and outputting a control signal corresponding thereto. The shift of the automatic transmission according to claim 1, further comprising outputting a control signal for traveling at the current throttle and the shift stage when the vehicle speed No1 set by the driver is the same as the current traveling vehicle speed No2 of the vehicle. Control method.