JP2009216172A - Continuously variable transmission control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pump control device enabling to variably control an input rotating speed depending on a shift speed (command hydraulic pressure) without establishing a proportional relationship between an engine revolving speed and an oil pump rotating speed. <P>SOLUTION: This continuously variable transmission control device is provided for controlling a continuously variable transmission which consists of an oil pump to be rotationally driven with the driving force of an engine, and a continuously variable transmission mechanism for controlling a shift speed with the hydraulic pressure of the oil pump. It comprises an oil pump speed shifting mechanism 23 for shifting the rotating speed of the oil pump 16 to the revolution of the engine, a shift speed determining part 12 for determining the shift speed of the continuously variable transmission, and an oil pump speed shift control part 13 using the transmission for varying the pump rotating speed so that the pump rotating speed is higher as the shift speed of the continuously variable transmission is higher. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a continuously variable transmission control device, and more particularly to a continuously variable transmission control device that controls the operation of an oil pump installed as a hydraulic pressure generation source in the continuously variable transmission.

2. Description of the Related Art Conventionally, an oil pump installed as a hydraulic pressure generation source in a continuously variable transmission (CVT) is known.
This oil pump is disposed on the engine output shaft of the CVT transmission, and is driven by a rotational driving force generated when the engine is operated.

As such an oil pump, for example, a “hydraulic control mechanism of a continuously variable transmission” (see Patent Document 1) is known. In this "continuously variable transmission hydraulic control mechanism", oil from the oil pump is supplied to the driving hydraulic chamber and driven hydraulic chamber, respectively, and the hydraulic pressure is controlled to change the gear ratio of the continuously variable transmission. I am letting.
Japanese Patent Laid-Open No. 03-121369

  However, the conventional oil pump is driven by the rotational driving force generated when the engine is operated, and the engine rotational speed and the oil pump rotational speed are in a proportional relationship, so that it is not necessary to drive the oil pump at high speed. However, when the engine is driven at a high speed, the oil pump is also driven at a high speed. For this reason, energy is consumed unnecessarily by unnecessary high rotation driving, resulting in deterioration of fuel consumption.

In addition, since the engine speed and the oil pump speed are in a proportional relationship, the speed required for the oil pump can be obtained in a region where the engine is driven at a low speed and the oil pump needs to be driven at a high speed. As a result, the necessary shift response cannot be obtained.
An object of the present invention is to provide a continuously variable transmission control device capable of variably controlling an input rotational speed in accordance with a shift speed (command hydraulic pressure) without causing an engine rotational speed and an oil pump rotational speed to be proportional to each other. It is.

  In order to achieve the above object, a continuously variable transmission control device according to the present invention includes an oil pump that is rotationally driven by a driving force of an engine and a continuously variable transmission mechanism that performs shift control by hydraulic pressure from the oil pump. In the continuously variable transmission control device for controlling a continuously variable transmission, an oil pump transmission mechanism that shifts the number of rotations of the oil pump with respect to the rotation of the engine, a shift speed determining unit that determines a shift speed of the continuously variable transmission, And an oil pump shift control unit that varies the pump rotation speed so that the pump rotation speed increases when the shift speed of the stepped transmission is high.

  According to this invention, the oil pump that is rotationally driven by the driving force of the engine and generates the hydraulic pressure for performing the shift control of the continuously variable transmission has the shift speed of the continuously variable transmission determined by the shift speed determining unit. Since the gear speed control unit varies the pump speed so that the pump speed increases when the speed of the continuously variable transmission is high, the input speed is not proportional to the engine speed and the oil pump speed. Variable control can be performed in accordance with the shift speed (command oil pressure).

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a continuously variable transmission control apparatus according to an embodiment of the present invention. As shown in FIG. 1, the continuously variable transmission control device 10 includes a sensor information input unit 11, a shift speed determination unit 12, an oil pump shift control unit 13, and a system control unit 14. The operation of the oil pump 16 is controlled.
The system control unit 14 performs shift control of the continuously variable transmission of the transmission 15.

  The transmission 15 is a belt-type continuously variable transmission (CVT), and is transmitted to an input side pulley (primary pulley) 17 and a drive shaft, along with an oil pump 16, from which driving force from an engine (not shown) is input. An output-side pulley (secondary pulley) 18 that outputs a driving force and an actuator 19 are provided. The primary pulley 17 and the secondary pulley 18 are connected by, for example, a V belt 20, and the rotation of the primary pulley 17 is transmitted to the secondary pulley 18 via the V belt 20.

The transmission 15 is provided with a rotation sensor 21 that detects the rotation speed of the primary pulley 17 and a rotation sensor 22 that detects the rotation speed of the secondary pulley 18. The rotation speed information a of the primary pulley 17 detected by the rotation sensor 21 and the rotation speed information b of the secondary pulley 18 detected by the rotation sensor 22 are output to the sensor information input unit 11 of the oil pump control device 10.
The oil pump 16 is rotationally driven by the operation of the engine to generate a pumping force, and functions as a hydraulic pressure generation source in the transmission 15. The transmission control of the transmission 15 that is a belt type CVT is performed by the hydraulic pressure generated by the oil pump 16.

The actuator 19 is composed of various hydraulic actuators, and functions as a mechanical driving force (for example, clutch operating force) generation source in the oil pump transmission mechanism.
The sensor information input unit 11 inputs the rotational speed information a of the primary pulley 17 and the rotational speed information b of the secondary pulley 18 to input a speed change speed formed in the transmission 15 based on both the rotational speed information a and b. The shift speed information c is output to the shift speed determination unit 12.
The shift speed determination unit 12 determines the shift speed detected in the transmission 15 based on the input shift speed information c, and based on this determination result, the command hydraulic pressure for the command hydraulic pressure that is required in the transmission 15 Information d is generated, and the generated command hydraulic pressure information d is output to the oil pump shift control unit 13.

Based on the input command hydraulic pressure information d, the oil pump shift control unit 13 generates shift instruction information e for instructing the oil pump 16 to shift gears in order to vary the rotation speed of the oil pump 16 according to the rotation speed of the engine. The oil pump shift control unit 13 sends the fact that the shift control of the oil pump 16 is performed to the actuator 19 that performs the shift control of the continuously variable transmission as drive instruction information f.
The system control unit 14 includes a CPU (Central Processing Unit) and storage means, and controls each processing operation in the shift speed determination unit 12, the oil pump shift control unit 13, and the continuously variable transmission control device 10 as a whole.

With the above-described configuration, the continuously variable transmission control device 10 includes the transmission speed determination unit 12 and the transmission speed determination unit 12 to which the transmission speed information c based on the rotation speed information a and b output from the transmission 15 is input. The oil pump shift control unit 13 to which the output command hydraulic pressure information d is input performs variable control for varying the input rotational speed of the oil pump 16 driven by the engine according to the shift speed detected in the transmission 15. it can.
That is, the operation of the oil pump 16 is changed according to the speed of the continuously variable transmission (CVT) transmission 15.

As a result, it is possible to obtain the optimum input speed of the oil pump 16 according to the shift speed (command oil pressure) detected in the transmission 15.
In the continuously variable transmission control device 10, the oil pump shift control unit 13 performs variable control for switching the input rotational speed of the oil pump 16 driven by the engine based on the control map.
FIG. 2 shows a control map based on the correspondence between the engine speed and the transmission speed, (a) is an explanatory diagram of the control map when the oil pump speed is controlled to be decelerated, and (b) is an increase in the oil pump speed. It is explanatory drawing of the control map in the case of controlling.

  As shown in FIG. 2, the oil pump speed change control unit 13 uses the speed reduction speed detected by the transmission 15 and the deceleration control map based on the engine speed (see (a)), and the oil pump speed that is the normal speed. Variable control for switching between the normal state and the oil pump rotational speed deceleration state where the rotational speed is decelerated from the normal state is performed, or according to the speed increase control map (see (b)) based on the shift speed detected in the transmission 15 and the engine rotational speed. Then, variable control is performed to switch between an oil pump rotation speed acceleration state in which the rotation speed is increased from the normal speed and an oil pump rotation speed normal state that is a normal rotation speed. A plurality of types of control maps are provided for each oil temperature.

  In this way, in the region where the oil pump 16 does not need to be driven at a high speed by switching between the normal oil pump rotational speed state which is the normal rotational speed and the oil pump rotational speed deceleration state where the rotational speed is reduced than usual. Since the number of revolutions of the oil pump 16 can be reduced, the friction by the oil pump 16 is reduced and the fuel consumption is improved. Further, in an area where the oil pump 16 needs to be driven at a high speed by switching between an oil pump rotation speed increasing state where the rotation speed is increased than usual and an oil pump rotation speed normal state which is a normal rotation speed. Since the rotation speed of the oil pump 16 can be increased, a comfortable speed change response in the oil pump 16 can be obtained.

The oil pump shift control unit 13 controls the oil pump 16 so that the number of revolutions of the oil pump 16 is low when the engine is started. Thereby, the load applied to the starter when starting the engine can be reduced.
Further, when the transmission mechanism of the oil pump transmission mechanism is a two-speed switching mechanism, one of the two clutches is a one-way clutch. Thereby, even when the rotation speed of the oil pump 16 cannot be changed due to a clutch failure, it is possible to obtain the rotation speed of the oil pump 16 for supplying necessary oil to the transmission 15 when the vehicle is traveling.

FIG. 3 is a skeleton explanatory diagram showing a schematic configuration of an oil pump transmission mechanism including a two-speed switching mechanism. As shown in FIG. 3, the oil pump speed change mechanism 23 including a two-speed switching mechanism includes a first gear 23a, a second gear 23b, a third gear 23c, a fourth gear 23d, a one-way clutch portion 23e, and a clutch portion 23f. Have. Here, the gear ratio (transmission ratio) of the second gear 23b is set to be larger than 1 with respect to the first gear 23a, and the gear ratio (transmission ratio) of the fourth gear 23d is set to be smaller than 1 with respect to the third gear 23c. .
The speed change mechanism 23 receives the driving force input from the engine 24 in order to the first input gear 24a, the chain 24b, and the second input gear 24c via the second input gear 24c. The driving force input to the speed change mechanism 23 is output to the oil pump 16.

The driving force transmitted from the engine 24 to the second input gear 24c is transmitted from the secondary pulley 18 to the first gear 23a and further to the second gear 23b, and from the first gear 23a via the one-way clutch portion 23e. It is transmitted to the third gear 23c and further to the fourth gear 23d. The driving force transmitted to the second gear 23b is transmitted to the fourth gear 23d via the clutch portion 23f. The driving force transmitted to the fourth gear 23d is transmitted to the oil pump 16.
The actuator 19 is used to switch the clutch part 23f between ON (ON) and OFF (OFF).

  When the clutch portion 23f is engaged by the speed change mechanism 23 having the above-described configuration, the driving force from the engine 24 is transmitted to rotate the first gear 23a, and the rotation from the first gear 23a to the second gear 23b. The speed is increased by transmission, and is transmitted from the second gear 23 b to the fourth gear 23 d via the clutch portion 23 f and further transmitted to the oil pump 16. Therefore, the rotation speed of the oil pump 16 increases. On the other hand, when the clutch portion 23f is not engaged, the one-way clutch portion 23e is operated, the driving force from the engine 24 is transmitted to rotate the first gear 23a, and the rotation is from the first gear 23a to the one-way clutch portion 23e. And then transmitted to the third gear 23c, transmitted from the third gear 23c to the fourth gear 23d, decelerated, and transmitted from the fourth gear 23d to the oil pump 16. Therefore, the rotation speed of the oil pump 16 is reduced.

  FIG. 4 is a flowchart showing a flow of control processing (part 1) in the continuously variable transmission control device of FIG. As shown in FIG. 4, first, a shift speed is calculated from sensor information input to the continuously variable transmission control device 10 (step S101). When the shift speed information c based on the calculated shift speed is input to the shift speed determining unit 12, the shift speed determining unit 12 calculates a command hydraulic pressure (step S102). When the command hydraulic pressure information d based on the calculated command hydraulic pressure is input to the oil pump shift control unit 13, the oil pump shift control unit 13 determines whether or not the oil pump 16 can be decelerated (step S103).

As a result of the determination, if deceleration is not possible (No), the process returns to step S102 to calculate the command hydraulic pressure. If deceleration is possible (Yes), the oil pump shift control unit 13 instructs the oil pump 16 to decelerate. (Step S104). Thereafter, the process ends.
That is, when the clutch portion 23f is engaged and the rotational speed of the oil pump 16 is in the normal state, the rotational speed of the oil pump 16 is reduced when the clutch portion 23f is not engaged.

  FIG. 5 is a flowchart showing a flow of control processing (part 2) in the oil pump control device of FIG. As shown in FIG. 5, first, a shift speed is calculated from the sensor information input to the continuously variable transmission control device 10 (step S201). When the shift speed information c based on the calculated shift speed is input to the shift speed determining unit 12, the shift speed determining unit 12 calculates a command hydraulic pressure (step S202). When the command hydraulic pressure information d based on the calculated command hydraulic pressure is input to the oil pump shift control unit 13, the oil pump shift control unit 13 determines whether or not the oil pump 16 needs to be accelerated (step S203).

As a result of the determination, if the speed increase is not necessary (No), the process returns to Step S202 to calculate the command oil pressure. If the speed increase is necessary (Yes), the oil pump shift control unit 13 increases the oil pump 16 with respect to the oil pump 16. A speed instruction is issued (step S204). Thereafter, the process ends.
That is, when the rotational speed of the oil pump 16 is increased when the clutch portion 23f is engaged, the rotational speed of the oil pump 16 is normal when the clutch portion 23f is not engaged.
Further, when the rotational speed of the oil pump 16 is set to the normal state when the clutch portion 23f is engaged, when the engine is started, the hydraulic pressure is not raised and the clutch portion 23f is not engaged, and the rotational speed of the oil pump 16 is decelerated. The load applied to the starter when starting the engine is reduced.

Note that the speed change mechanism of the transmission 15 may be switched from deceleration to acceleration as the second speed switching mechanism described above, or may be switched from deceleration to normal speed as the third speed switching mechanism.
6A and 6B show the operation of the clutch shown in FIG. 3. FIG. 6A is an explanatory diagram of the basic state, FIG. 6B is an explanatory diagram of the actuator in a normally-on state, and FIG. .
As shown in FIG. 6, in the basic state, the operation of the clutch portion 23f is in the engaged state at the constant hydraulic pressure and in the non-engaged state at the control hydraulic pressure (see (a)).

  When the rotational speed of the oil pump 16 is in the normal state when the clutch portion 23f is engaged, the actuator 19 for controlling the clutch portion 23f is normally on (ON) (see (b)). For this reason, even if the actuator 19 fails, the clutch portion 23f is in the engaged state, and the rotation speed of the oil pump 16 is in the normal state. Note that the control hydraulic pressure is not engaged. Thereby, the rotation speed of the oil pump 16 for supplying the necessary oil to the transmission 15 when the vehicle is running can be obtained.

  Further, when the speed of the oil pump 16 is increased when the clutch portion 23f is engaged, the actuator 19 for controlling the clutch portion 23f is normally turned off (see (c)). For this reason, in the unlikely event that the actuator 19 fails, the clutch portion 23f is not engaged, and the rotation speed of the oil pump 16 is in a normal state. Note that the control hydraulic pressure is in the engaged state. Thereby, the rotation speed of the oil pump 16 for supplying the necessary oil to the transmission 15 when the vehicle is running can be obtained.

As described above, a continuously variable transmission control apparatus according to the present invention includes a continuously variable transmission mechanism that includes an oil pump that is rotationally driven by the driving force of an engine, and a continuously variable transmission mechanism that performs transmission control by the hydraulic pressure from the oil pump. In a continuously variable transmission control device that controls a transmission, an oil pump transmission mechanism that changes a rotational speed of an oil pump with respect to the rotation of the engine, a transmission speed determination unit that determines a transmission speed of the continuously variable transmission, And an oil pump shift control unit that varies the pump rotation speed using the transmission so that the pump rotation speed increases when the transmission speed of the continuously variable transmission is high.
Further, in the present invention, the oil pump shift control unit has an oil pump rotation speed normal state that is a normal rotation speed based on a deceleration control map based on the shift speed detected in the continuously variable transmission and the engine rotation speed, It is preferable to perform variable control to switch to an oil pump rotational speed deceleration state in which the rotational speed is decelerated from normal.

In the present invention, the oil pump shift control unit increases the oil pump rotation speed by increasing the rotation speed from the normal speed based on the speed increase control map based on the shift speed detected in the continuously variable transmission and the engine rotation speed. It is preferable to perform variable control to switch between a speed state and an oil pump rotation speed normal state that is a normal rotation speed.
In the present invention, it is preferable that the oil pump shift control unit performs control so that the pump rotational speed is low when the engine is started.
In the present invention, it is preferable that the oil pump transmission mechanism is a two-speed switching mechanism, and one of the gears is connected to the engine drive shaft via a one-way clutch.

It is a block diagram which shows schematic structure of the oil pump control apparatus which concerns on one embodiment of this invention. The control map based on a response | compatibility of an engine speed and a transmission speed is shown, (a) is explanatory drawing of the control map in the case of carrying out deceleration control of the oil pump rotation speed, (b) is in the case of carrying out acceleration control of the oil pump speed. It is explanatory drawing of a control map. It is skeleton explanatory drawing which shows schematic structure of the speed change mechanism which consists of a 2nd speed switching mechanism. It is a flowchart which shows the flow of the control processing (the 1) in the oil pump control apparatus of FIG. It is a flowchart which shows the flow of the control processing (the 2) in the oil pump control apparatus of FIG. 3A and 3B illustrate the operation of the clutch, in which FIG. 3A is an explanatory diagram of a basic state, FIG. 3B is an explanatory diagram of an actuator in a normally-on state, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Continuously variable transmission control apparatus 11 Sensor information input part 12 Shift speed judgment part 13 Oil pump transmission control part 14 System control part 15 Transmission 16 Oil pump 17 Primary pulley 18 Secondary pulley 19 Actuator 20 V belt 21, 22 Rotation sensor 23 Oil Pump transmission mechanism 23a 1st gear 23b 2nd gear 23c 3rd gear 23d 4th gear 23e One way clutch part 23f Clutch part 24 Engine 24a 1st input gear 24b Chain 24c 2nd input gear a, b Rotational speed information c Shift speed information d Command hydraulic pressure information e Shift command information f Drive command information

Claims (5)

An oil pump that is rotationally driven by the driving force of the engine;
In a continuously variable transmission control device that controls a continuously variable transmission that includes a continuously variable transmission mechanism that performs transmission control by hydraulic pressure from the oil pump,
An oil pump speed change mechanism that changes the number of rotations of the oil pump relative to the rotation of the engine;
A shift speed determining unit for determining a shift speed of the continuously variable transmission;
An continuously variable transmission control device comprising: an oil pump transmission control unit that varies the pump rotation speed using the transmission so that the pump rotation speed increases when the transmission speed of the continuously variable transmission is high. . The oil pump speed change control unit
Based on the deceleration control map based on the transmission speed detected in the continuously variable transmission and the engine speed, the oil pump speed normal state which is the normal speed and the oil pump speed speed reduced state where the speed is decelerated from the normal speed. The continuously variable transmission control device according to claim 1, wherein variable control for switching is performed. The oil pump speed change control unit
Based on the speed increase control map based on the speed change speed and engine speed detected in the continuously variable transmission, the oil pump speed increase state in which the speed is increased from the normal speed, and the oil pump speed that is the normal speed The continuously variable transmission control device according to claim 1, wherein variable control for switching to a normal state is performed.   The continuously variable transmission control device according to any one of claims 1 to 3, wherein the oil pump shift control unit controls the pump rotation speed to be low when the engine is started.   The continuously variable transmission according to any one of claims 1 to 4, wherein the oil pump transmission mechanism is a two-speed switching mechanism, and one of the gears is connected to the engine drive shaft via a one-way clutch. Transmission control device.

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