KR100316908B1 - An apparatus for controlinc cut back solenoid valve and a method thereof - Google Patents

Abstract

PURPOSE: A control apparatus of a cutback solenoid valve and a method thereof are provided to improve shift quality in shifting up at the intermediate range of the throttle opening degree by lowering line pressure with operating the cutback solenoid valve. CONSTITUTION: A cutback solenoid valve control device is composed of a travel state detecting unit(10) outputting an electric signal by receiving the signal according to the travel state; a TCU(transmission control unit)(20) reading the signal from the travel state detecting unit, and outputting switching time of a solenoid valve according to the throttle valve opening degree and vehicle speed in outputting an upshift control signal during traveling; and a driving unit(30) stabilizing shifting by switching the solenoid valve according to the switching time from the TCU. Shift quality is improved by operating the cutback solenoid valve to lower line pressure in shifting up.

Description

AN APPARATUS FOR CONTROLINC CUT BACK SOLENOID VALVE AND A METHOD THEREOF

The present invention relates to an automatic transmission for a light vehicle, and more particularly, to a cutback solenoid valve control apparatus and a method for performing a shift without shift shock during an uplift shift in an intermediate throttle region.

In general, a vehicle equipped with an automatic transmission that is controlled only by on / off control of a solenoid valve without performing hydraulic duty control and performs shifting, as shown in FIG. 4, a throttle signal that is varied and output according to a change in the opening degree of a throttle valve. The cutback solenoid valve is operated by turning on the cutback solenoid valve below α%, which is the opening of the set throttle valve, to switch to the low hydraulic zone A and to the high hydraulic zone B above α%.

The low hydraulic region A described above makes the line pressure as low as possible in order to improve the feeling of shifting during oscillation shift and throttle off. In addition, the high hydraulic zone B is set high for the response angle of the automatic transmission engagement element in accordance with the engine output.

However, in the above-described conventional technique, when the throttle valve opening degree is less than or equal to the set value α% or close to 100%, the line pressure close to the ideal line pressure shown in the dotted line can be set as shown in FIG. In this case, there is a problem that the shifting feeling is deteriorated especially when the power-up shift is performed due to the excessive capacity of the engaging elements.

In other words, B, which is a high hydraulic pressure area, is set in terms of the capacity angle of the engagement element relative to the maximum output torque of the engine.In the region where the throttle valve opening degree is greater than or equal to α% and less than 100%, Since it needs to be set properly, there is a problem of generating shift shock.

In addition, it is ideal to change the line pressure according to the engine characteristics, but there is a problem that the price increases if the throttle pressure control valve, throttle cable, etc. is added to this.

Accordingly, an object of the present invention is to solve the above problems, to provide a cutback solenoid valve control device and a method for improving the shifting feeling during upshift shift in the middle throttle opening area without causing a price increase factor. It is for.

1 is a block diagram of a cutback solenoid valve control apparatus according to an embodiment of the present invention;

2 is a flowchart illustrating a method of controlling a cutback solenoid valve according to an exemplary embodiment of the present invention;

Figure 3 is a graph of the cutback solenoid valve operation in accordance with an embodiment of the present invention,

4 is a shift pattern diagram according to an embodiment of the present invention;

4 is a graph of a conventional cutback solenoid valve.

The present invention for achieving the above object,

In the automatic transmission which is controlled only by the on / off control of the solenoid valve without performing the hydraulic duty control, the automatic transmission is shifted according to the driving state of the vehicle to receive the corresponding electric signal by receiving the output signal. Vehicle driving state sensing means for outputting;

A TCU that receives and outputs a signal output from the vehicle driving state detecting means and sets and outputs a solenoid valve switching time according to the opening amount of the throttle valve and the vehicle speed when an upshift shift control signal is output during driving;

It characterized in that it comprises a drive means for performing a stable shift by switching the corresponding solenoid valve in accordance with the solenoid valve switching time output from the TCU.

Another invention for achieving the above object,

In a shift control method of an automatic transmission that is controlled only by on / off control of a solenoid valve without performing hydraulic duty control, the shift control method for detecting a throttle valve opening degree? If the throttle opening degree is smaller than the throttle valve opening amount θ, which is set to a value larger than the electric throttle valve opening amount θ when the shift stage is an upshift shifting condition, the line pressure control solenoid valve is Characterized in that it comprises the step of switching in the direction in which the pressure is lowered.

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 Figure 1, the configuration of the cutback solenoid valve control apparatus according to the embodiment of the present invention,

A vehicle driving state sensing means 10 which receives a signal that is varied in the state of the vehicle and outputs a corresponding electric signal according to the driving state of the vehicle;

After receiving the signal output from the vehicle driving state detecting means 10 and outputting a 1 → 2 or 2 → 3 upshift shifting control signal while driving, the solenoid valve switching time is set according to the opening amount of the throttle valve and the vehicle speed. Control means 20 for outputting;

It consists of a drive means 30 for performing a stable shift by switching the solenoid valve in accordance with the solenoid valve switching time output from the control means 20.

In the above, the vehicle driving state detection means 10,

A throttle valve opening detection unit 11 for detecting an opening degree of a throttle valve whose opening / closing state is variable in association with an operation state of the accelerator pedal and outputting a corresponding signal;

A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal;

The shift lever sensing unit 13 detects a signal that is changed according to a shift lever operating state of a driver and outputs a predetermined electric signal.

The control means 20 may be any means for performing the cutback solenoid valve control method of the embodiment of the present invention described below, but as an example, a conventional transmission control unit programmed to perform the method of the present invention ( Transmission Control Unit (TCU), and the transmission control unit may be a microprocessor operating by a program.

As is well known, an automatic transmission that performs shifting by driving an on / off controlled solenoid valve includes a cut back solenoid valve for controlling hydraulic pressure high or low according to a set logic. The drive means 30 is a cutback solenoid valve.

A control method of the cutback solenoid valve made by the above-described configuration will be described with reference to FIG.

When the driver operates the accelerator pedal in a vehicle traveling at one speed by the driver, the control means (hereinafter referred to as TCU) 20 detects the opening amount θ of the variable throttle valve and detects the traveling vehicle speed No. The target shift stage is set according to the shift pattern diagram stored in the memory shown in FIG. 4, and it is determined whether the shift condition for shifting the shift stage to the target shift stage is established (S100 and S110).

When the shift condition for shifting the shift stage to the target shift stage is established, the TCU 20 determines whether the shift condition established above is a 1 → 2 upshift shift condition (S120).

When it is determined that the shift condition established above is a 1 → 2 upshift shift condition, the TCU 20 transmits a predetermined control signal for shifting the shift stage 1 → 2 upshift to the cutback solenoid valve, which is the driving means 30. Output and start accumulating the operation on time of the cutback solenoid valve which is the drive means 30 (S130).

Accordingly, the TCU 20 determines whether the opening groove θ of the throttle valve according to the driver's accelerator pedal operation is smaller than β1 which is a predetermined reference value shown in FIG. 4 (S140).

When the opening degree θ of the throttle valve according to the driver's accelerator pedal operation is smaller than β1 which is a predetermined reference value, the TCU 20 outputs a predetermined control signal to the driving means 30 to drive the driving means 30. ) Cuts the solenoid valve to ON (S150).

However, when the opening amount θ of the throttle valve according to the driver's accelerator pedal operation is larger than β1 which is a predetermined set reference value shown in FIG. 3, the TCU 20 is changed by the driver according to the accelerator pedal operation. Return to the initial stage of detecting the throttle valve opening amount?

However, when the shift stage does not perform the 1 → 2 upshift shift in S130, the TCU 20 determines whether the cutback solenoid valve, which is the driving means 30, is operated (S121).

When the cutback solenoid valve, which is the driving means 30, is operated on, the TCU 20 determines whether the operation on time of the cutback solenoid valve accumulated in the step S130 has passed a predetermined reference time To. (S122).

When the operation on time of the cutback solenoid valve accumulated in S130 does not pass the predetermined reference time To, the TCU 20 sets the predetermined predetermined throttle valve opening amount θ as shown in FIG. It is determined whether it is larger than β2 which is a reference value of (S123).

When the throttle valve opening amount θ is larger than β2, which is the predetermined predetermined reference value shown in FIG. 3, the TCU 20 outputs a predetermined control signal to the driving means 30 to drive the driving means 30. The cutback solenoid valve is turned off and returned to the initial stage (S124).

However, when the operation on time of the cutback solenoid valve accumulated in S122 has passed a predetermined reference time To, the TCU 20 immediately outputs a predetermined control signal to the driving means 30 to drive the driving means. Turn off the cutback solenoid valve (30) and return.

When the shift condition for upshifting the shift stage to the target shift stage is not established even in the driver's accelerator pedal operation in S110, the TCU 20 may change the opening amount of the throttle valve which varies according to the driver's accelerator pedal operation. is determined to be greater than [alpha] 2, which is the predetermined predetermined reference value shown in Fig. 3 (S111).

When the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is larger than α2, which is the predetermined reference value shown in FIG. 3, the TCU 20 sends a predetermined control signal to the drive means 30. Outputs to perform the step (S124) of operating off the cutback solenoid valve drive unit 30 and returns to the initial stage.

However, when the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is smaller than α2 which is a predetermined reference value shown in FIG. 3, the TCU 20 is changed according to the driver's accelerator pedal operation. It is determined whether the throttle valve opening amount θ is smaller than α1 which is the predetermined predetermined reference value shown in FIG. 3 (S11l2).

When the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is smaller than α1, which is the predetermined reference value shown in FIG. 3, the TCU 20 sends a predetermined control signal to the drive means 30. Outputs to perform the step (S150) of operating the cutback solenoid valve which is the driving means 30 and returns to the initial stage.

However, when the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is greater than α1 which is the predetermined reference value shown in FIG. 3, the TCU 20 is changed according to the driver's accelerator pedal operation. Return to the initial stage for detecting the throttle valve opening amount?

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, in the embodiment of the present invention, when the throttle valve opening amount is equal to or less than the opening amount, the upshift shifting feeling is improved in the middle throttle opening degree region because the cutback solenoid valve is operated to decrease the line pressure.

Claims (10)

In the cutback solenoid control method for shift control of an automatic transmission that is controlled only by on / off control of a solenoid valve without performing hydraulic duty control, the shift is performed. Detects the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation while driving, and when the shift stage is under the upshift shifting condition, when the throttle opening degree is smaller than the set throttle valve opening amount β1 value, the line pressure is maintained for a predetermined time. And a control step of switching the control solenoid valve in a direction in which the line pressure decreases. The method according to claim 1, wherein the control step, Is the shifting condition for shifting the shifting stage to the target shifting stage by detecting the opening amount (θ) of the throttle valve which is variable according to the operation of the driver's accelerator pedal in the driving vehicle and detecting the traveling vehicle speed (No)? Determining; Determining whether the established shift condition is an upshift shift condition when the shift condition for shifting the shift stage to the target shift stage is established in the first step; When it is determined that the shift condition established in the step is an upshift shift condition, a predetermined control signal for upshift shifting the shift stage is output to the drive means, the operation on time of the drive means is accumulated, and the detection is performed. Determining whether the opening amount? Of the throttle valve, which is variable according to the accelerator pedal operation of the driver, is smaller than β1, which is a predetermined reference value; And a step of outputting a predetermined control signal to the driving means to turn on the driving means when the opening amount θ of the throttle valve is smaller than β1 which is a predetermined set reference value. The throttle valve opening amount θ that is varied according to the accelerator pedal operation is detected by the driver when the opening amount θ of the throttle valve according to the driver's accelerator pedal operation is larger than β1, which is a predetermined set reference value. Cutback solenoid valve control method further comprising the step of returning to the initial stage. The method of claim 2, further comprising: determining whether the driving means is on when the shift stage is not performing the upshift shifting; Determining whether the accumulated operation time of the driving means has passed a predetermined reference time (To) when the driving means (30) is turned on in the step; Determining whether the throttle valve opening amount [theta] is larger than [beta] 2, which is a predetermined reference value, when the operation on time accumulated in the step does not pass the predetermined reference time To; The cutback solenoid valve further comprises outputting a predetermined control signal to the driving means to turn off the driving means and return to the initial stage when the throttle valve opening amount θ is larger than β2 which is a predetermined reference value. Control method. The method according to claim 4, wherein when the accumulated operation time of the driving means has passed a predetermined reference time (To), outputting a predetermined control signal to the driving means immediately turns off the driving means and returns to the initial stage. Cutback solenoid valve control method further comprises. The throttle valve opening amount θ varying according to the driver's accelerator pedal operation is predetermined when the shift condition for upshifting the shift stage to the target shift stage is not established even in the driver's accelerator pedal operation. Determining whether the reference value is greater than α 2; When the throttle valve opening amount? Is variable according to the driver's accelerator pedal operation in the above step, is larger than α2, which is a predetermined reference value, outputting a predetermined control signal to turn off the driving means. A method for controlling a cutback solenoid valve further comprising returning. The throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is set when the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is smaller than α2 which is a reference value of the set firing. Determining whether the predetermined reference value is smaller than α1; In the above step, if the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is smaller than a predetermined reference value α1, a step of outputting a predetermined control signal to turn on the driving means is performed. A method for controlling a cutback solenoid valve further comprising returning. The throttle valve opening amount θ variable according to the driver's accelerator pedal operation is detected when the throttle valve opening amount θ that is variable according to the driver's accelerator pedal operation is greater than α1 which is a predetermined reference value. Cutback solenoid valve control method further comprising the step of returning to the initial stage. In the automatic transmission which is controlled only by the solenoid valve and the on / off control without performing the hydraulic duty control, the automatic transmission is shifted according to the driving state of the vehicle to receive the corresponding electric signal by receiving the output signal. Vehicle driving state sensing means for outputting; A TCU that receives and outputs a signal output from the vehicle driving state detecting means and sets and outputs a solenoid valve switching time according to the opening amount of the throttle valve and the vehicle speed when an upshift shift control signal is output during driving; It includes a drive means for performing a stable shift by switching the solenoid valve in accordance with the solenoid valve switching time output from the TCU, Cutback solenoid valve control device characterized in that the TCU performs the method of any one of claims 1 to 8. 10. The apparatus of claim 9, wherein the vehicle driving state detecting unit comprises: a throttle valve opening degree detecting unit configured to detect an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of the accelerator pedal and output a corresponding signal; A vehicle speed detector for detecting a driving speed of the vehicle and outputting a corresponding signal; Cutback solenoid valve control device comprising a shift lever detection unit for outputting a predetermined electric signal by detecting the output signal is changed in accordance with the shift lever operating state of the driver.

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