JPH03134363A - Line pressure controller for automatic transmission - Google Patents

Abstract

PURPOSE:To reduce the shock by the changeover of the operation of auxiliaries so as to improve comfortableness in operation by putting it in constitution of properly controlling the line pressure of an automatic transmission, accompanying the operation changeover of auxiliaries driven by an engine. CONSTITUTION:This line pressure controller for automatic transmission is equipped with a line pressure setting means, which sets the line pressure according to the quantity of fuel injection to be supplied to an engine or the value equivalent to this, and an auxiliaries consumption torque operating means, which operates the amount of engine output torque consumption by auxiliaries based on the quantity of fluctuation of engine operating conditions at the time of start-up of driving of the auxiliaries driven by the engine. And it is constituted such that the consumption torque operated by the auxiliaries consumption torque operating means is stored in an auxiliaries consumption torque storage means, that the driving of auxiliaries is detected by an auxiliaries driving detecting means, and that the line pressure set by the line pressure setting means is compensated based on the value stored in the auxiliaries consumption torque storage means, when the auxiliaries are driven, by a line pressure compensating means.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for controlling line pressure of an automatic transmission mounted on an automobile.

<Prior art> In automobiles equipped with automatic transmissions, the oil discharged from the oil pump is adjusted to an appropriate line pressure according to the throttle valve opening of the engine, and each shift element of the automatic transmission is controlled. It is common that the oil pressure is supplied to a hydraulic circuit of II+.

By the way, the line pressure needs to be adjusted to an appropriate oil pressure according to the output torque of the engine. If it is higher than the appropriate oil pressure, the torque transmission rate will be high and engine vibrations and gear change shocks will be transmitted to the axle, resulting in noise. or vibration becomes louder. Also, if the oil pressure is lower than the appropriate oil pressure, the tightening force of gears etc. will be weakened.
Unnecessary slipping occurs, significantly reducing transmission efficiency, and in the worst case, clutches, etc. may break due to friction.

In this regard, in the method of adjusting line pressure using the throttle valve opening as a parameter of the engine output torque, the throttle valve opening does not necessarily reflect the output torque accurately, so the line pressure corresponding to the output torque The pressure will not be set.

Therefore, the fuel injection amount Tp to the engine, which is a value that almost accurately reflects the output torque of the engine, is read from the fuel injection amount control system, or the value corresponding to the fuel injection amount Tp is calculated from the intake air flow rate Q. There is a system in which the line pressure is set according to the fuel injection amount Tp (Japanese Patent Laid-Open No. 62-905).
(See Publication No. 4, etc.)

<Problems to be Solved by the Invention> Incidentally, the engine output torque is also affected by the operation of various auxiliary machines driven by the engine such as an air conditioner, but the operating state of the auxiliary machines depends on the fuel injection MTp or the intake air flow rate. Since this is not reflected in Q, the conventional line pressure control device cannot obtain an appropriate line pressure commensurate with the engine output torque when switching the operation of auxiliary machinery. In particular, there is a problem in that a shift shock occurs when the shift operation and the operation switching of auxiliary machinery overlap.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a line pressure control device for an automatic transmission that can set an appropriate line pressure even when the engine output torque fluctuates due to operation switching of auxiliary equipment. do.

<Means for Solving the Problems> Therefore, as shown in FIG. 1, the present invention provides a line pressure control device for an automatic transmission that controls line pressure supplied to a hydraulic circuit that controls each transmission element. A line pressure setting means that sets the line pressure according to the amount of fuel injection supplied to the engine or a value equivalent thereto, and a line pressure setting means that sets the line pressure according to the amount of fuel injection supplied to the engine or a value equivalent to this, and based on the amount of variation in the engine operating state quantity at the start of the drive of auxiliary equipment driven by the engine. An auxiliary machinery consumption torque calculation means for calculating engine output torque consumption by the auxiliary machinery; an auxiliary machinery consumption torque storage means for storing the consumption torque calculated by the auxiliary machinery consumption torque calculation means; auxiliary machinery drive detection means for detecting the drive of the auxiliary machinery; and line pressure set by the line pressure setting means based on a stored value stored in the auxiliary machinery consumption torque storage means when the auxiliary machinery is driven. and a line pressure correction means for correcting the line pressure.

<Operation> In the above configuration, the auxiliary machinery consumption torque calculation means calculates in advance the engine output torque consumption by the auxiliary machinery when the auxiliary machinery is driven, and this calculated value is calculated as the auxiliary machinery consumption torque. Store it in your storage device (.

When the auxiliary machinery drive detection means detects the driving of the auxiliary machinery, the line pressure correction means adjusts the line pressure set by the line pressure setting means to the engine using the auxiliary machinery determined and stored in advance. Correct based on output torque consumption. This makes it possible to obtain a line pressure that is compatible with the engine output torque, which varies as the auxiliary machinery is driven.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 2 showing the configuration of an embodiment, an oil pump 1
is driven by the output shaft of the engine 13 via a torque converter, that is, by the input shaft of the transmission. The electromagnetic valve 2 obtains a pilot pressure based on the discharge pressure of the oil pump 1 which is duty-controlled by a signal from the control unit 11 and guided through the orifice 3. This pilot pressure is amplified by the pressure modifier valve 4 and then input to the pressure regulator valve 5, which regulates the discharge pressure from the oil pump 1 to a line pressure proportional to the pilot pressure. , for torque converters (for power transmission)
6. For lubrication 7. 8° for cooling, for generating hydraulic pressure 9. Others 1
0 to each hydraulic circuit.

Note that there is a valve at the end of the circuit 9 for generating hydraulic pressure to operate the clutch, brake, etc. in combination according to the gear position.

A control unit 11 with a built-in microcomputer that duty-controls the electromagnetic valve 2 receives a basic fuel injection amount T from a control unit 12 for engine control.
Valve opening duty Dis of the p-multiple signal and idle control valve 23
In addition to the C signal, the rotation speed N signal from the rotation speed sensor 14 that detects the rotation speed of the engine 13, and the throttle sensor 1 attached to the throttle valve 16 interposed in the intake passage 15.
Throttle valve opening θ signal from 7, vehicle speed detected by vehicle speed sensor 18 Signal 2 An operating signal from an auxiliary device driven by an auxiliary device, such as an air conditioner operating switch 19, battery 2
Battery voltage from 4 ■3 Signals etc. are manually input.

On the other hand, the control unit 1-12 for engine control includes an electromagnetic fuel injection valve 20 provided downstream of the throttle valve 16.
The fuel injection amount is controlled by intermittently outputting a fuel injection amount Ti signal with a pulse width corresponding to the intake air amount in synchronization with the rotation of the engine 13. Further, the throttle valve 1
A valve opening duty Disc signal based on the detected engine speed is output to the idle control valve 23 installed in the auxiliary air passage 22 that bypasses the engine 6, thereby controlling the auxiliary air flow rate and controlling the engine 13 when the engine is idling. Control the idle rotation speed to the target rotation speed.

The fuel injection amount Ti is determined by the basic fuel injection iTp (=to-Q/ N; is a constant) is calculated, and this is applied to various correction coefficients C0E set based on water temperature, etc.
Corrected by F and the voltage correction numerator s of the battery 24 (
Ti=Tp-COEF+Ts) is obtained.

The control unit 11 controls the line pressure using a built-in microcomputer according to the flowchart shown in FIG.

In step 1 (denoted as S in the figure), the basic fuel injection amount Tp from the engine control control unit 12 is read.

In step 2, the engine output torque T is retrieved from a map stored in the ROM of the microcomputer in advance based on the basic fuel injection amount Tp.

In step 3, whether the air conditioner operation switch 19 is ON or O
It is determined whether the auxiliary equipment is being driven or not depending on whether the FF is turned on or not. That is, the function of step 3 corresponds to the auxiliary machinery drive detection means.

If the determination in step 3 is YES, the process proceeds to step 4, and if the determination is NO, the process skips step 4 and proceeds to step 6.

In step 4, the engine output torque consumption numerator by auxiliary machinery, which is calculated by the auxiliary machinery consumption torque calculation routine described later and stored in the RAM of the microcomputer, is added to the engine output torque T retrieved in step 2. By doing so, the engine output torque is corrected.

In step 5, the engine output torque T obtained in step 2 is stored in advance in the ROM when the auxiliary equipment is not being driven, and the engine output torque T obtained in step 4 is used when the auxiliary equipment is being driven. The line pressure PL at that time is searched from the map. Regarding line pressure PL,
The basic line pressure during non-shifting and the line pressure during shifting operation at each gear stage are mapped, and the line pressure is corrected according to the shift state at that time. That is, the ROM and the functions of step 2.5 correspond to line pressure setting means. Furthermore, the ROM and the functions of step 4.5 correspond to line pressure correction means.

In step 6, a duty signal corresponding to the retrieved line pressure PL is output to the electromagnetic valve 2.

Next, a calculation routine for the engine output torque consumption numerator' by the auxiliary machinery will be explained according to the flowchart of FIG.

In step 11, it is determined whether or not the calculation area is for the torque consumed by auxiliary machinery. Preferably, the region is when the torque consumed by the auxiliary equipment is noticeable, for example, when the vehicle is idling, and is determined based on the signal from the throttle sensor 16.

If the determination in step 11 is NO, the process ends without calculating the consumed torque. Further, when the determination is YES, the process proceeds to step 12.

In step 12, it is determined whether the auxiliary machinery is operating.

If the determination is No in step 12, step 13
Proceed to.

In step 13, compensation is made for at least one of the engine operating state B quantities that vary due to the drive of auxiliary equipment, such as the engine rotational speed N, the control duty Dtsc of the idle control valve 23 + the basic fuel injection amount TP, or the battery voltage (8). Load the value when the machine is not being driven (initial value) RA
Store in M.

Further, if the determination in step 12 is YES, the process proceeds to step 14.

In step 14, the amount of engine output torque consumed by driving the auxiliary machinery, that is, the torque consumed by the auxiliary machinery T' is determined. As shown in FIG. 5, this is the difference between the amount of change in the operating state quantity that changes with the start-up of the drive of the auxiliary equipment, that is, the maximum value and the initial value of the operating state quantity that has already been stored. ΔN.

ΔDisc, ΔTp, or Δ■ is determined, and the consumed torque T'' by the auxiliary equipment is searched from a pre-stored map showing the relationship between the amount of change and the consumed torque. That is, the function of step 14 is performed by the auxiliary equipment. This corresponds to consumption torque calculation means.

In step 15, the searched consumption torque T' is stored in the RAM.
to be memorized. That is, the RAM corresponds to auxiliary machinery consumption torque storage means.

Then, the consumed torque T" stored in the RAM is
It is used for line pressure control shown in the figure to correct line pressure for auxiliary equipment.

According to the line pressure control device having such a configuration, the amount of variation in the engine output torque caused by driving the auxiliary equipment is determined in advance, and the engine output torque to the transmission side, which changes due to operation switching of the auxiliary equipment, is calculated based on the variation amount. By making corrections based on this, it is possible to correct engine output torque fluctuations due to operation switching of auxiliary machinery, and to perform good line pressure control. Therefore, it is possible to reduce the shock caused by switching the operation of the auxiliary machinery.

<Effects of the Invention> As explained above, according to the present invention, line pressure control in an automatic transmission can be properly controlled in accordance with operation switching of auxiliary machinery driven by the engine, and Shocks caused by operation switching can be reduced, and driving comfort can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a flowchart showing line pressure control of the same embodiment, and FIG. 4 is a diagram showing the implementation of the same. FIG. 5 is a flowchart showing an example of an auxiliary equipment consumption torque calculation routine, and FIG. 5 is a time chart showing changes in operating state quantities as the auxiliary equipment is driven. 1...Oil pump 2...Solenoid valve 11
゜12... Control unit 13... i-kan 14... Rotation speed sensor -7... Throttle sensor -9... Air conditioner operation switch 21...
・Air flow meta

Claims (1)

[Claims] In a line pressure control device for an automatic transmission that controls the line pressure supplied to the hydraulic circuit that controls each transmission element, the line sets the line pressure according to the amount of fuel injection supplied to the engine or a value equivalent to this. pressure setting means, auxiliary equipment consumption torque calculation means for calculating engine output torque consumption by the auxiliary equipment based on the amount of variation in the engine operating state quantity at the start of the drive of the auxiliary equipment driven by the engine; an auxiliary machinery consumption torque storage means for storing the consumed torque calculated by the machinery consumption torque calculation means; an auxiliary machinery drive detection means for detecting the drive of the auxiliary machinery; and a line set by the line pressure setting means. A line pressure correction means for correcting line pressure based on a stored value stored in the auxiliary machinery consumption torque storage means when the auxiliary machinery is driven. Pressure control device.