JPH04331869A - Hydraulic control - Google Patents

Abstract

PURPOSE:To obtain the hydraulic control method which can simplify the control structure used in setting the lock-up state in a fluid transmission device equipped with a lock-up mechanism. CONSTITUTION:A damper clutch control valve 9 which selects the oil passages for the first hydraulic chamber 5 for connecting a damper clutch 4 which is formed oppositely to the damper clutch 4 of a lock-up mechamis 1 and the second hydraulic chamber 6 for separating the damper clutch 4 is provided. When the oil passage to a pressure adjusting valve is connected and this oil passage is connected with an oil passage for the first hydraulic chamber 5, the hydraulic pressure proportional to the square of the number of engine revolution is set, and automatic connection/disconnection for the damper clutch 4 is carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control method, and more particularly to a hydraulic control method for setting a lock-up in a fluid transmission device with a lock-up mechanism.

0002

[Prior Art] In a fluid transmission device using a so-called fluid coupling with a lock-up mechanism, a lock-up state occurs in which a pump impeller and a turbine runner are directly connected within the coupling during constant speed running. may be set. The above-mentioned lock-up state occurs when the damper clutch fixed to the turbine runner is activated when it is detected that there is no change in the throttle opening, no change in vehicle speed, and no change in engine speed, resulting in a restricted cruising state. It is set by pressing against the pump impeller under hydraulic control. For this reason, the hydraulic control unit for engaging and disengaging the damper clutch is equipped with various sensors for determining constant-speed running as described above, or the rotation between the input side and output side of the rotational force within the fluid coupling. Sensors are installed to detect the difference, and the information from these sensors is stored to calculate and control the target oil pressure for the damper clutch's engagement/disengagement operation, allowing feedback control or open loop control. It has become.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned hydraulic pressure setting method, the structure for setting the hydraulic pressure,
In particular, a large number of various sensors are required to output information for determining high-speed cruising conditions, and furthermore, a large number of logic circuits and memory for data storage are also required for discrimination based on the information from these sensors. Therefore, it was undeniable that electronic control would result in a complex structure.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with the hydraulic pressure control method used to control the lock-up state in the conventional lock-up mechanism, it is an object of the present invention to provide a method for controlling the lock-up state with a simple configuration. The purpose is to obtain a hydraulic control method.

[0005]

[Means for Solving the Problems] In order to achieve this object, the present invention provides a hydraulic control method for setting a lockup state in a fluid transmission device with a lockup mechanism, which comprises: A first hydraulic chamber for pressurizing the damper clutch to the pump impeller side by inflow of oil, and a first hydraulic chamber sandwiching the damper clutch.
A second hydraulic chamber is provided at a position facing the hydraulic chamber, and separates the damper clutch from the pump impeller by the inflow of oil, and an oil passage communicating with the first and second hydraulic chambers and the engine torque. A damper clutch control valve is connected to an oil passage communicating with a pressure regulating valve that sets the corresponding line pressure, and is equipped with an internal spool that switches the connection state of this oil passage. a damper clutch control solenoid valve having a function of fixing the position of the spool in the damper clutch control valve at a position where an oil passage to the second hydraulic chamber is set; The double valve is characterized in that when the vehicle is running, a hydraulic pressure proportional to the square of the engine speed is applied to the first hydraulic chamber.

[0006]

According to the present invention, when the vehicle is running, the oil pressure is set in the first hydraulic chamber in proportion to the square of the engine speed, and the lock-up state is automatically set.

[0007]

[Embodiment] Details of an embodiment of the present invention will be explained below with reference to FIGS. 1 to 3. FIG. 1 shows the main parts of a lock-up mechanism in a fluid coupling used to carry out a hydraulic control method according to an embodiment of the present invention. That is, the lock-up mechanism 1 includes a damper clutch 4 fixed to the turbine runner 2 and provided in a state capable of approaching and separating from the pump impeller 3. A first hydraulic chamber 5 and a second hydraulic chamber 6 are formed on both sides. The first hydraulic chamber described above controls the damper clutch 4 by pumping the impeller 3 by inflow of oil from the damper clutch control valve, which will be described later.
The second hydraulic chamber 6 is a portion that is bent toward the direction and pressed against the second hydraulic chamber 6, and the second hydraulic chamber 6 is a portion that has a function opposite to that of the first hydraulic chamber 5 described above.

On the other hand, the above-mentioned first and second hydraulic chambers 5 and 6
The oil passages 7 and 8 from the damper clutch control valve 9 are connected to ports at different positions in the damper clutch control valve 9. That is, the damper clutch control valve 9 is connected to the oil passage 7 described above.
, 8, a port connected to an oil passage 10 from a pressure regulating valve (not shown), and a port connected to a drain passage 11.
Each of the ports has a port connected thereto with an oil passage 12 for reversing the oil pressure supply state to the first and second oil pressure chambers, and each of these ports has a port connected thereto in the longitudinal direction. It is opened and closed by a movably provided spool 9A.

An oil passage 14 from a damper clutch control solenoid valve 13 is connected to one side of the damper clutch control valve 9, which corresponds to one end of the spool 9A in the moving direction. When the damper clutch control solenoid valve 13 is set to the de-energized position based on a signal in the transmission control unit, the biasing spring 15 causes the spool 9A to be set to the first hydraulic pressure as shown in the figure. The position is set to lead oil from chamber 5 to the drain. Damper clutch control mentioned above
For example, the select lever position of the solenoid valve 13 for
When in the "N" or "P" range, the de-energized state is set, and when a range other than the above-mentioned range is selected, the spool 9A moves against the biasing spring 15 for adjustment. A position is set in which the oil passage 10 from the pressure valve and the oil passage 7 to the first hydraulic chamber 5 are communicated with each other. In this embodiment, in the lock-up mechanism 1 having the above-described configuration, when the oil passages 7 and 10 in the damper clutch control valve 9 are set to communicate with each other, as shown in FIG. A hydraulic pressure proportional to the square of the engine rotation speed is applied to the hydraulic chamber 5. That is, this method will be explained in the steps shown in FIG.
When the position of the spool 9A in the damper clutch control valve 9 is set to communicate with the oil passage 7 and the oil passage 10,
Detects the engine speed on the engine controller side,
After calculating the oil pressure proportional to the square of this rotation speed as the target oil pressure (Pth), set the duty ratio on the pressure regulating valve side so that this target oil pressure (Pth) is obtained. , adjust the oil pressure.

0010

[Effects of the Invention] As described above, according to the present invention, when setting the connection state of the damper clutch in the lock-up mechanism,
The damper clutch is automatically connected by applying hydraulic pressure proportional to the square of the engine speed. In other words, when the oil pressure obtained from the vehicle speed reaches a value corresponding to the lock-up setting, the lock-up state is set by the oil pressure applied to the lock-up mechanism even if the state is not detected, so lock-up detection and There is no need to particularly provide structural components such as a detection structure for hydraulic control of the damper clutch or a computer for control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a configuration for executing a hydraulic control method according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining characteristics of the groove width control device shown in FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the groove width control device shown in FIG. 1;

[Explanation of symbols]

1 Lockup mechanism 2 Turbine runner 3 Pump impeller 4 Damper clutch 5 First hydraulic chamber 6 Second hydraulic chamber 7 Oil passage 8 communicating with the first hydraulic chamber
Oil passage 9 communicating with the second hydraulic chamber Damper clutch control valve 9A Spool 10 Oil passage from the pressure regulating valve

Claims (1)

[Claims] 1. A hydraulic control method for setting a lock-up state in a fluid transmission device with a lock-up mechanism, wherein the lock-up mechanism presses a damper clutch against a pump impeller side by inflow of oil. The first hydraulic chamber and the first damper clutch are sandwiched between the first hydraulic chamber and the damper clutch.
A second hydraulic chamber is provided at a position facing the hydraulic chamber, and separates the damper clutch from the pump impeller by the inflow of oil, and an oil passage communicating with the first and second hydraulic chambers and the engine torque. A damper clutch control valve is connected to an oil passage communicating with a pressure regulating valve that sets the corresponding line pressure, and is equipped with an internal spool that switches the connection state of this oil passage. a damper clutch control solenoid valve having a function of fixing the position of the spool in the damper clutch control valve at a position where an oil passage to the second hydraulic chamber is set; 2. A hydraulic control method, characterized in that the oil pressure control method is characterized in that, during traveling, a hydraulic pressure proportional to the square of the engine rotational speed is applied to the first hydraulic chamber.