KR19980045490A - Creep control unit and method for integrating engine and transmission control - Google Patents

Abstract

The present invention relates to an integrated creep control device and a method for controlling engine and transmission control, comprising: a vehicle information detecting unit (50) for detecting information indicating a state of a vehicle and outputting an electric signal according thereto, and input engine output control In response to a signal, the engine control signal is output according to whether the engine output control is possible, and according to the engine control unit 70 for outputting the notification signal and the signal output from the vehicle information detection unit 50, It is determined whether to perform creep control, and outputs an engine output control signal to the engine controller 70, receives a notification signal according thereto, and outputs a signal for controlling a shift state according to the value of the notification signal. A shift control solenoid valve 80 that operates according to a shift control unit 60 and a signal output from the shift control unit 60 to determine a shift state. The fuel injection device 90 operates according to an engine control signal output from the engine control unit 70 and adjusts the output of the engine. The driver's convenience, which is the advantage of the automatic transmission, is prevented from being pushed backward, and the driving force of the vehicle is lowered to prevent contact with the front vehicle even when the driver does not press the brake on the flat surface.

Description

Creep control unit and method for integrating engine and transmission control

The present invention relates to a creep control device and a method for controlling an engine and a transmission by controlling an engine and a transmission so that efficient control is achieved in creep control of an automobile.

Creep control is a control that is performed when the shift lever is set to the driving stage (D or 2) after the start of a vehicle equipped with an automatic transmission, so that the vehicle does not reverse in a short stop or on a relatively low road. When the driver presses the accelerator pedal, it guarantees driving to the first stage without a great shock.

Driving control of a vehicle equipped with an automatic transmission is performed in a transmission control unit (TCU), wherein the transmission control unit uses a two-speed shift control solenoid valve to determine a shift stage of the automatic transmission. Pressure control solenoid valve, which regulates the operating pressure, does not engage the kick down band with strong hydraulic pressure at 2 speeds, but rather by holding the kick down band with some hydraulic pressure. By causing slipping, a method of controlling the speed change stage to be located between the 1st speed and the 2nd speed is taken.

Hereinafter, a creep control device of the related art will be described with reference to the accompanying drawings.

As shown in FIG. 1, the structure of the creep control apparatus of the prior art is comprised as follows.

A shift lever detecting unit 11 for detecting a position of a shift lever and outputting an electric signal according to the shift lever, a transmission drive rotation speed sensing unit 12 for detecting a transmission drive rotation speed and outputting an electric signal according to the transmission lever; An idle switch 13 that detects whether an idle state is output and outputs an electrical signal, and a throttle valve opening amount detection unit 14 which detects an opening amount of a throttle valve and outputs an electrical signal accordingly. ), And a creep control by receiving a signal output from the shift lever detection unit 11, the transmission drive speed detection unit 12, the idle switch 13, and the throttle valve opening amount detection unit 14. A shift control unit 20 for determining whether to implement the shift control unit and outputting a shift control signal according to the shift control unit 20, and a shift control solenoid for determining a shift state by operating according to a signal output from the shift control unit 20. It consists of a de-valve 30.

Operation of the prior art creep control device is as follows.

The shift lever detecting unit 11 detects the position of the shift lever and outputs an electrical signal accordingly, and the transmission drive rotation speed detection unit 12 detects the transmission drive rotation speed and outputs an electrical signal accordingly.

In addition, the idle switch 13 detects whether the vehicle engine is in an idle state and outputs an electrical signal accordingly, and the throttle valve opening amount detecting unit 14 detects an improvement of the throttle valve and thereby generates an electrical signal. Outputs

The control unit 20 receives a signal output from the shift lever detection unit 11, the transmission drive speed detection unit 12, the idle switch 13, and the throttle valve opening amount detection unit 14, It is determined whether or not to perform creep control, and outputs a shift control signal according thereto, and the shift control solenoid valve 30 operates according to the signal output from the shift control unit 20 to determine a shift state.

The operation of the controller 20 will be described in detail with reference to FIG. 2 as follows.

The control unit 20 reads the signal output from the shift lever detecting unit 11 and determines whether the shift lever is located at the 'D' end or the '2' end (S10).

In the step S10, when the shift lever is located at the 'D' end or the '2' end, the control unit 20 reads a signal output from the transmission drive rotation speed detection unit 12 and rotates the transmission drive. It is determined whether the number is 460 or less per minute (S20).

If the transmission drive rotational speed is less than 460 times per minute in the step S20, the control unit 20 reads the signal output from the idle switch 13, and determines whether or not the accelerator pedal is closed (S30).

When it is determined in step S30 that the accelerator pedal is fully closed, the controller 20 receives a signal output from the throttle valve opening amount detecting unit 14, and the magnitude of the signal is 0.94 volts or less. It is determined whether or not the recognition (S40).

When the magnitude of the signal output from the throttle valve opening amount detector 14 in step S40 is 0.94 volts or less, the controller 20 performs creep control (S50).

3 shows the duty ratio of the pressure regulating solenoid valve at this time, and it can be seen that it is about 68.8%.

However, in the above steps (S10, S20, S30, S40), the shift lever is not at the 'D' end or the '2' end, or the transmission drive rotation speed exceeds 460 times per minute, or the idle switch is turned off. If the throttle opening voltage exceeds 0.94 volts, the shift stage control by the shift pattern is performed (S55).

Then, the control unit 20 reads the signal output from the shift lever detecting unit 11 again, and determines whether the shift lever is located at the 'D' end or the '2' end (S60).

In step S60, when the shift lever is not positioned at the 'D' stage or the '2' stage and is at the 'P' stage, the 'N' stage, the 'R' stage, or the 'L' stage, the controller 20 ) Stops the creep control and performs normal control (S100).

On the other hand, when the shift lever is located at the 'D' end or '2' end in the step (S60), the control unit 20 reads the signal output from the transmission drive rotation speed detection unit 12, the transmission drive It is determined whether the rotation speed is 470 or more times per minute (S70).

When the transmission drive rotation speed is 470 or more times per minute in the step S70, the control unit 20 stops creep control, and performs normal control (S100).

However, when the transmission drive rotation speed is less than 470 times per minute in the step S70, the control unit 20 reads the signal output from the idle switch 13, and determines whether the idle switch is off (off). (S80).

When it is determined in step S80 that the idle switch is turned off, the controller 20 stops creep control and performs normal control (S100).

On the other hand, if it is determined in step S80 that the accelerator pedal is closed, the control unit 20 receives a signal output from the throttle valve opening amount detection unit 14, the magnitude of the signal is 1.17 volts or more Determine whether or not (S90).

If the magnitude of the signal output from the throttle valve opening amount detector 14 in step S90 is 1.17 volts or more, the control unit 20 stops creep control and performs normal control (S100).

However, if the magnitude of the signal output from the throttle valve opening amount detector 14 in step S90 is less than 1.17 volts, the control unit 20 returns to step S50 to continue the creep control.

By creep control in the above manner, the vehicle does not move backwards even when the driver does not press the brake pedal on a relatively low slope road, thereby providing convenience for the driver's driving.

By the way, the prior art creep control device can prevent the back of the car on the road with a low inclination, but when the inclination of the road is large, the car is pushed back unless the driver presses the brake pedal, the automatic transmission vehicle There is a problem of reducing the driver's convenience, which is an advantage.

In addition, by the electronic control in the shift control device to hold the kick-down band with a certain hydraulic pressure, the vehicle moves in the forward direction in a flat state, in this case, if the driver does not step on the brake pedal, the contact with the front vehicle problem occurs There is this.

In addition, creep control is performed on all vehicles during mass production of the vehicle, but the creep control results are different for each occurrence of an error due to the difference in the characteristics of each mass production vehicle, and some vehicles have a large creep phenomenon, but some vehicles have a small creep phenomenon. Therefore, there is a problem that becomes a factor that lowers the confidence of the owner of the automatic transmission vehicle.

In addition, the creep control adjusted according to the development purpose in the vehicle development also causes errors due to the continuous use of the vehicle, which causes a decrease in reliability. The wear of various clutches and brakes in the automatic transmission and the characteristics of the automatic transmission oil change. Therefore, there is a problem that the vehicle creep control result is not constant due to continuous use of the vehicle.

Accordingly, an object of the present invention is to solve the above problems, so that the vehicle is not pushed back even when the driver does not step on the brake pedal on the road with a large inclination of the road, thereby increasing the convenience of the driver, which is an advantage of the automatic transmission, The present invention provides a creep control device and a method through an engine and a transmission control that lower a driving force of a vehicle and prevent contact with a front vehicle even when a driver does not brake on a flat surface.

Further, another object of the present invention is to reduce the occurrence of errors due to differences in vehicle characteristics during mass production of the vehicle, to ensure accurate creep control consistent with the purpose of vehicle development, and to maintain various types of clutches in the automatic transmission according to the continuous use of the vehicle. The present invention provides an integrated creep control device and a method for controlling an engine and a transmission that can compensate for errors even when abrasion of brakes and automatic transmission oil characteristics are changed to improve reliability.

The structure of this invention for achieving the said objective is comprised as follows.

Vehicle information detecting means for detecting information indicating a state of the vehicle and outputting an electrical signal according thereto;

Engine control means for operating according to an input engine output control signal, outputting an engine control signal according to whether the engine output can be controlled, and outputting a notification signal accordingly;

Receiving a signal output from the vehicle information sensing means, it is determined whether or not to perform a creep control, and outputs an engine output control signal to the engine control means, receives a corresponding notification signal, the input of the notification signal Shift control means for outputting a signal for controlling the shift state in accordance with the value;

Shift control driving means for operating in accordance with a signal output from said shift control means to determine a shift state;

It consists of a fuel injection means which operates according to the engine control signal output from the said engine control means, and adjusts the output of an engine.

Another configuration of the present invention for achieving the above object is made as follows.

Determining whether or not to read the vehicle information and to perform the creep control;

Outputting an engine output control request signal and an engine output control amount when it is determined in the step that creep control is to be performed;

Determining whether engine output control is possible by reading an engine output controllable signal;

If it is determined that engine output control is possible in the step, performing creep control in consideration of engine power control;

If it is determined that engine output control is not possible in the step, performing creep control of the transmission alone;

Reading vehicle information to determine whether the situation is to end creep control;

If it is determined in the above stage that the creep control is not to be ended, the process returns to the step of outputting the engine output request signal and the engine output control amount, and otherwise, the normal control is performed.

Another configuration of the present invention for achieving the above object is made as follows.

Reading an engine output request signal to determine whether to request to control engine output;

If it is determined in the step to require the control of the engine power, determining whether the engine power control is possible;

If it is determined that engine output control is possible in the step, controlling the engine output according to the engine output control amount and outputting a signal accordingly;

If it is determined in the step that the engine output control is impossible, the step of outputting the engine output control impossible signal.

1 is a block diagram applying a creep control device of the prior art,

2 is an operation flowchart applying the creep control method of the prior art,

3 is a waveform diagram showing a creep control condition of the prior art,

4 is a block diagram to which a creep control apparatus is applied through an engine and a transmission control according to an embodiment of the present invention;

5 is a flowchart illustrating an operation of applying a creep control method through a transmission control according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating an operation of applying a creep control method through engine control according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described an integrated creep control device for the engine and transmission control according to an embodiment of the present invention.

As shown in FIG. 3, the configuration of a creep control device integrating engine and transmission control according to an embodiment of the present invention is constituted as follows.

The vehicle information sensor 50 detects information indicating the state of the vehicle and outputs an electrical signal according to the vehicle information, and operates according to the input engine output control signal, and outputs an engine control signal according to whether the engine output can be controlled. The engine controller 70 outputs a notification signal and the signal output from the vehicle information sensor 50 determines whether to perform a creep control, and sends the engine control unit 70 to the engine controller 70. A shift control unit 60 for outputting an engine output control signal and receiving a notification signal according thereto, and outputting a signal for controlling a shift state according to a value of the notification signal; and a signal output from the shift control unit 60. Operating according to the shift control solenoid valve 80 determining the shift state and the engine control signal output from the engine control unit 70, It consists of a fuel injection device 90 for adjusting the force.

The vehicle information sensing unit 50 is configured as follows.

A shift lever detecting unit 51 for detecting a position of the shift lever and outputting an electric signal according to the shift lever; an idle switch 52 for detecting whether the shift state is idle and outputting an electric signal according to the state of the throttle valve; It consists of a throttle valve opening amount detection unit 53 for detecting the opening amount and outputting the electrical signal, and a transmission drive rotation speed detection unit 54 for detecting the transmission drive rotational speed and outputs the electrical signal accordingly. have.

The operation of the present invention made as described above is as follows.

The vehicle information detecting unit 50 detects information representing the state of the vehicle and outputs an electrical signal accordingly.

That is, the shift lever detecting unit 51 of the vehicle information detecting unit 50 detects the position of the shift lever and outputs an electrical signal accordingly, and the idle switch 52 detects whether the idle state is in the idle state. Output electrical signal accordingly.

In addition, the throttle valve opening amount detection unit 53 detects the opening amount of the throttle valve and outputs an electrical signal according thereto, and the transmission drive rotation speed detection unit 54 detects the transmission drive rotation speed and thereby electrically Output the signal.

The engine controller 60 operates according to the input engine output control signal, outputs an engine control signal according to whether the engine output control is possible, and outputs a notification signal accordingly.

The shift control unit 70 receives a signal output from the vehicle information detecting unit 50, determines whether to perform creep control, and outputs an engine output control signal to the engine control unit 70. In response to the notification signal, a signal for controlling a shift state according to the value of the notification signal is output.

The shift control solenoid valve 80 operates according to the signal output from the shift control unit 60 to determine a shift state, and the fuel injection device 90 according to the engine control signal output from the engine control unit 70. To adjust the output of the engine.

5 and 6, the operation of the engine control unit and the shift control unit will be described in detail as follows.

The shift control unit 60 reads the vehicle information output from the vehicle information detecting unit 50 and determines whether or not the situation is to be creep controlled (S110).

That is, by reading the signal output from the shift lever detecting unit 51, it is determined whether the shift lever is located at the 'D' end or the '2' end.

When it is determined that the shift lever is located at the 'D' end or the '2' end, the shift control unit 60 reads the signal output from the idle switch 52 again, and whether the engine is in the idle state. Judge.

The signal output from the transmission drive rotation speed detection unit 12 is read to determine whether the transmission drive rotation speed is 460 times or less per minute (S20).

When it is determined that the engine is in the idle state, the shift control unit 60 reads a signal output from the throttle valve opening amount detection unit 53, and determines whether the signal value is equal to or less than a first reference voltage that is set in advance. Determine whether or not.

Here, the magnitude of the first reference voltage is set to about 0.94 volts.

When it is determined in the above that the throttle valve opening amount signal is 0.94 boat or less, the shift control unit 60 reads the signal output from the transmission drive rotation speed detection unit 54, and determines whether the value is equal to or less than a preset reference value. It is determined whether or not (S120).

If it is determined in step S120 that the transmission drive rotation speed is less than or equal to the reference value, it is determined that creep control is necessary, and the shift control unit 60 transmits an engine output control request signal and an engine output control amount to the engine control unit 70. Output (S130).

The engine control unit 70 reads the engine output request signal output from the shift control unit 60 to determine whether to request engine output control (S210).

When it is determined in step S210 that the signal output from the shift controller 60 requests engine output control, the engine controller 70 determines whether engine output control is possible (S220).

When it is determined in step S220 that the engine output control is possible, the engine control unit 70 controls the engine output according to the engine output control amount output from the shift control unit 60 (S230).

Then, the engine control unit 70 outputs an engine output control enable signal to the shift control unit 60 (S240).

However, when it is determined in the step (S220) that the engine output control is impossible, the engine control unit 70 outputs an engine output control disable signal to the shift control unit (60) (S250).

The shift control unit 60 outputs an engine output control request signal and an engine output control amount to the engine control unit 70 (S130), and then reads the engine output controllable signal output from the engine control unit 70 to output the engine. It is determined whether control is possible (S140).

When it is determined that engine output control is possible in step S140, the shift control unit 60 performs creep control in consideration of engine output control (S150).

However, when it is determined that the engine output control is impossible in the step (S140), the shift control unit 60 performs a creep control by the transmission alone control (S160).

Then, the shift control unit 60 reads the signal output from the vehicle information detection unit 50 again and determines whether or not it is a situation to end the creep control (S170).

That is, by reading the signal output from the shift lever detecting unit 51, it is determined whether the shift lever is located at the stage other than the 'D' stage or the '2' stage.

When it is determined that the shift lever is located at a stage other than the 'D' stage or the '2' stage, the shift control unit 60 terminates the creep control and performs normal control (S180).

However, when it is determined in the above that the shift lever is located at the 'D' end or the '2' end, the shift control unit 60 reads the signal output from the idle switch 52 again, so that the engine is in the idle state. Determine whether or not.

When it is determined that the engine is not in the idle state, the shift control unit 60 ends the creep control and performs normal control (S180).

However, when it is determined in the above that the engine is in the idling state, the shift control unit 60 reads a signal output from the throttle valve opening amount detection unit 53 and the second reference voltage whose signal value is set in advance. It is judged whether or not it is abnormal.

Here, the magnitude of the second reference voltage is set to about 1.17 volts.

When it is determined in the above that the throttle valve opening amount signal is 1.17 volts or more, the shift control unit 60 ends the creep control and performs normal control (S180).

However, when it is determined in the above that the throttle valve opening amount signal is less than 1.17 volts, the shift control section 60 reads the signal output from the transmission drive rotation speed detection section 54, and the reference value is preset. The process returns to step S120 to determine whether or not it is less than or equal to.

Therefore, the present invention operating as described above has the effect of increasing the convenience of the driver, which is an advantage of the automatic transmission, by preventing the vehicle from being pushed back even when the driver does not press the brake pedal on the road having a large inclination of the road.

Further, even when the driver does not press the brake on a flat surface, the driving force of the vehicle can be lowered to prevent contact with the front vehicle.

In addition, the present invention, which operates as described above, reduces the occurrence of errors due to differences in vehicle characteristics during mass production of the vehicle, ensures accurate creep control consistent with the purpose of vehicle development, and also provides various clutches in the automatic transmission according to the continuous use of the vehicle. Even the wear of brakes and brakes and the change of the automatic transmission oil characteristics have the effect of compensating for errors and improving reliability.

Claims (4)

Vehicle information detecting means for detecting information indicating a state of the vehicle and outputting an electrical signal according thereto; Engine control means for operating according to an input engine output control signal, outputting an engine control signal according to whether the engine output can be controlled, and outputting a notification signal according thereto; In response to the signal output from the vehicle information sensing unit, it is determined whether to perform creep control, and outputs an engine output control signal to the engine control means, and receives a notification signal according to the input of the notification signal. Shift control means for outputting a signal for controlling the shift state in accordance with the value; Shift control driving means for operating in accordance with a signal output from said shift control means to determine a shift state; And a fuel injection means configured to operate according to an engine control signal output from the engine control means to adjust an output of the engine. The method according to claim 1, wherein the configuration of the vehicle information detecting means, Shift lever sensing means for sensing a position of a shift lever and outputting an electrical signal according thereto; Idle state detection means for detecting whether the vehicle is in an idle state and outputting an electrical signal accordingly; A throttle valve opening amount detecting means for detecting an opening amount of a throttle valve and outputting an electric signal accordingly; An engine and a creep control apparatus through a transmission control, characterized in that the transmission drive rotation speed sensing means for detecting the transmission drive rotation speed and outputs an electrical signal accordingly. Determining whether or not to read the vehicle information and to perform the creep control; Outputting an engine output control request signal and an engine output control amount when it is determined in the step that creep control is to be performed; Determining whether engine output control is possible by reading an engine output controllable signal; If it is determined that engine output control is possible in the step, performing creep control in consideration of engine power control; If it is determined that engine output control is not possible in the step, performing creep control of the transmission alone; Reading vehicle information to determine whether the situation is to end creep control; If it is determined in the above step that it is not necessary to end the creep control, the control returns to the step of outputting the engine output request signal and the engine output control amount, and otherwise, the transmission control comprising the step of performing normal control. Creep control method through. Reading an engine output request signal to determine whether to request to control engine output; If it is determined in the step to require the control of the engine power, determining whether the engine power control is possible; If it is determined that engine output control is possible in the step, controlling the engine output according to the engine output control amount and outputting a signal accordingly; And if it is determined that engine output control is impossible in the step, outputting an engine output control impossible signal.