JPH0681941A - Output torque detecting device for torque converter and line pressure control device - Google Patents

Abstract

PURPOSE:To provide an output torque detecting device to be high-precisely detetactable of output torque of a torque converter and a line pressure control device to effectively utilize the output torque detecting device. CONSTITUTION:The speed ratio (e) of a torque converter is determined at S2. From the speed ratio (e), a capacity factor KP is computed from a map at S3. From the capacity factor KP and the number NE of revolution of engine, input torque TP, is determined at S4. From the input torque TP, the speed ratio (e), and a torque converter input pressure PTR, a torque ratio (t) is determined from a map at S5. From the input torque T and the torque ratio (t), output torque TT is determined at S6. From the output torque TT, a line pressure PL is set at S7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output torque detecting device for a torque converter and a line pressure control device utilizing the same, and more particularly to an improved torque converter turbine torque detecting technique.

[0002]

2. Description of the Related Art In a hydraulic circuit for controlling engagement / disengagement of various friction engagement elements of an automatic transmission, a source pressure generated by a hydraulic pump is used in a pressure regulator valve in a line proportional to the output torque of a torque converter. The pressure is adjusted, and the various frictional engagement elements are operated by this line pressure or by hydraulic pressure that is appropriately adjusted. Conventionally, as a technique for setting the line pressure, as described in Japanese Utility Model Laid-Open No. 1-69947, a map in which the input / output speeds of a torque converter and the relationship between these and the output torque of the torque converter are set in advance is usually used. A technique has been adopted in which the output torque is obtained based on the equation or and the line pressure proportional to the output torque is set.

[0003]

As described above, according to the conventional technique, the output torque is obtained regardless of the converter input pressure supplied to the torque converter. However, as shown in FIG. In the converter, the output torque, the converter input pressure, and the torque ratio have a correlation, and the output torque greatly fluctuates according to the magnitude of the converter input pressure.

Therefore, if the output torque of the torque converter is determined independently of the converter operating pressure as in the prior art, the output torque of the turbine cannot be determined accurately, and the error in the output torque becomes large. Cannot be properly set according to the actual output torque of the torque converter, and as a result, the pump loss of the hydraulic pump increases due to generation of excessive line pressure. An object of the present invention is to provide an output torque detection device of a torque converter that can detect the output torque of the torque converter with high accuracy, and a line pressure control device using the same.

[0005]

According to a first aspect of the present invention, there is provided an output torque detecting device for a torque converter, wherein the output torque detecting device detects an output torque of the torque converter. The input torque detecting device detects an input torque to the torque converter. Means, an operating pressure detecting means for detecting the operating pressure of the torque converter, an input torque detected by the torque detecting means, and a torque ratio based on the operating pressure detected by the operating pressure detecting means. The output torque detecting means detects the output torque based on the torque ratio and the input torque. According to a second aspect of the present invention, in the output torque detecting device for a torque converter according to the first aspect, the input torque detecting means detects the input torque via a speed ratio of the torque converter and a capacity coefficient of the torque converter. It is configured in.

A line pressure control device according to a third aspect is a line pressure control device for a hydraulic circuit of a hydraulically actuated automatic transmission, wherein input torque detecting means for detecting an input torque to a torque converter and operation of the torque converter. A pressure ratio is obtained based on the operating pressure detecting means for detecting pressure, the input torque detected by the torque detecting means, and the operating pressure detected by the operating pressure detecting means, and based on this torque ratio and the input torque. Output torque detecting means for detecting the output torque,
Line pressure control means for controlling the line pressure based on the output torque of the torque converter detected by the output torque detection means.

[0007]

In the output torque detecting device for the torque converter according to the first aspect of the present invention, the output torque detecting device for detecting the output torque of the torque converter comprises:
The input torque detecting means detects the input torque to the torque converter, the operating pressure detecting means detects the operating pressure of the torque converter, and the output torque detecting means detects the input torque detected by the torque detecting means and the operating pressure. The torque ratio is obtained based on the operating pressure detected by the detection means, and the output torque is detected based on this torque ratio and the input torque. As described above, since the operating pressure of the torque converter is detected and the operating pressure is taken into consideration to obtain the output torque of the torque converter, the output torque of the torque converter can be detected with high accuracy.

In the output torque detecting device of the torque converter according to the present invention, the input torque detecting means detects the input torque through the speed ratio of the torque converter and the capacity coefficient of the torque converter. It can be detected well.

In the line pressure control device according to a third aspect of the present invention, the torque converter of the torque converter is provided by the input torque detecting means, the operating pressure detecting means, the output torque detecting means, and the output torque detecting means. Although the output torque can be detected with high accuracy, the line pressure control means controls the line pressure based on the output torque of the torque converter detected by the output torque detection means. Since the line pressure can be set accurately, and excessive line pressure is not generated, pump loss of the hydraulic pump that supplies hydraulic pressure to the hydraulic circuit of the hydraulic automatic transmission can be reduced, and friction of the automatic transmission can be reduced. The fastening / unfastening of the fastening element can be appropriately controlled.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. A hydraulically actuated automatic transmission of an automobile has a general structure including a torque converter 1 and a planetary gear mechanism (not shown) connected to the torque converter 1, and the torque converter 1 includes, as shown in FIG. Engine output shaft 2
Of the torque converter 1, a turbine 4 facing the pump 3, a stator 4 supported between the pump 3 and the turbine 4 supported by a torque converter case 7 via a one-way clutch 6, A turbine shaft 8 and the like for outputting the output torque to the planetary gear mechanism are provided. Reference numeral 9 is a lock-up clutch.

Since a hydraulic circuit for controlling engagement / disengagement of various friction engagement elements (brake, clutch, etc.) of the automatic transmission is a general one, a hydraulic circuit portion related to the present invention will be described with reference to FIG. Referring to FIG. 2, the operating pressure of the line 11 connected to the discharge side of the pump 10 driven by the output shaft 2 of the engine is regulated to the line pressure P _L by the pressure regulating valve 12, and the line pressure P _L is adjusted. The pressure P _L is supplied to the solenoid reducing valve 13 through the line 11, and the line pressure is reduced by the solenoid reducing valve 13 to generate a constant pressure P _L.
C is supplied to the pressure regulating valve 15 via the line 14.

A duty solenoid valve 16 for generating the control pressure of the pressure regulating valve 15 is connected to a line 17 having a filter 17 and an orifice. The control pressure generated by the pressure regulating valve 15 is supplied to the control port of the pressure regulating valve 12 by a line 19, and the line pressure port 12a of the pressure regulating valve 12 is regulated by the duty solenoid valve 16 by the pressure regulating valve 15 the line pressure P _L which is proportional to the output torque of a controlled line pressure P _L torque converter 1 is produced through, the line pressure P _L is supplied to the other lines of lines 11, 20 and the hydraulic circuit In addition, the surplus of the generation of the line pressure P _L of the discharge operating oil pressure of the pump 10 is supplied from the pressure regulating valve 12 to the torque converter 1 via the lines 21, 22 and 23 as the input pressure P _TR. .

In the circuit of FIG. 1, the line 23 is
The line 24 is connected to the front chamber 25 of the torque converter 1 and to the rear chamber 26 of the torque converter 1, and the lockup control valve 27 switches the operating pressure supply according to the engagement / disengagement of the lockup clutch 28. Is done. A torque converter holding pressure valve 30 is provided in a line 29 for returning a part of the hydraulic oil in the torque converter 1 to the oil cooler.
Is provided with a pressure sensor 31 that detects the hydraulic pressure in the torque converter 1.

Next, the output torque detection control of the torque converter unique to the present application and the line pressure control for controlling the line pressure P _L based on the output torque of the torque converter detected by the output torque detection control will be described. As shown in FIG. 3, the control unit 40 for controlling the hydraulic circuit of the automatic transmission includes at least a turbine speed sensor 32 for detecting the speed of the turbine 4, an engine speed sensor 33, and A detection signal from the pressure sensor 31 is supplied, and the drive current i is output from the control unit 40 to the duty solenoid valve 16 of the pressure regulating valve 15.

In the control unit 40, a control program for line pressure control including output torque detection control and a map associated therewith are previously stored, and the line pressure control routine shown in FIG. Description will be made based on the flowchart and the maps of FIGS. 5 and 6.
Incidentally, the reference symbol Si (i = 1, 2, ...) In FIG. 4 indicates each step.

When the control is started at the same time as the operation of the automatic transmission is started, various signals (turbine speed N _T ,
The engine speed N _E and the torque converter input pressure P _TR ) are read, and then in S2, the speed ratio e of the torque converter is calculated as e = N _T / N _E. Next, S3
5, the speed coefficient e is applied to the map of FIG. 5 to calculate the capacity coefficient K _P of the torque converter 1. Next, at S4, the engine speed N _E and the capacity coefficient K _P are calculated.
_{Based on P} , the input torque T _P of the torque converter 1 is calculated by the formula shown.

Next, in S5, the torque converter 1
The torque ratio t is calculated based on the map of FIG. Figure 6
Shows the input torque T in the range of 2 to 30 kg · m._P
Is divided into 3 stages, for example, 2 to 5 Kg / cm²Range of
Luk converter input pressure P_TRIs divided into, for example, three stages
It consists of 9 maps. In other words, the torque ratio t
To describe, torque ratio t = G (e, T_P, P_TR)As
Is set to. Torque ratio of the torque converter 1
t is the speed ratio e and the input torque T obtained as described above.
_PAnd the torque converter detected by the pressure sensor 31.
Input pressure P _TRBased on the
Will be calculated.

Next, in S6, the output torque T _T of the turbine 4 is calculated by the equation T _T = T _P × t, and then in S7.
, The line pressure P _L is calculated by a predetermined function F (P _L ) based on the output torque T _T , the line pressure P _L is set to a value proportional to the output torque T _T of the turbine 4, and then S8 At, a drive current i (drive pulse) having a duty ratio for generating the line pressure P _L is output to the duty solenoid valve 16. Then, the above routine is repeatedly executed.

As described above, the speed ratio e is first obtained, the capacity coefficient K _P is calculated based on the speed ratio e, and the torque converter 1 is operated based on the capacity coefficient K _P and the engine speed N _E. Of the input torque T _P of the
And the input torque T _P and the torque converter input pressure P _TR , the torque ratio t is obtained, the output torque T _T of the turbine 4 is obtained based on the input torque T _P and the torque ratio t, and the output torque is obtained. Since the line pressure P _L is set based on T _T , the output torque T _T of the turbine 4 that takes the torque converter input pressure P _TR into consideration can be accurately obtained. Then, based on the output torque T _T of the turbine 4 obtained with high accuracy, the line pressure P _L can be set accurately in proportion to the output torque T _T of the turbine 4. As a result, excessive line pressure P _L is not generated, so that the pump loss of the hydraulic pump 10 can be reduced, and the engagement / disengagement of the friction engagement element of the automatic transmission can be appropriately controlled.

The torque converter 1 of the automatic transmission
The present invention is not limited to the one illustrated in FIG. 1, and may be various existing torque converters, or the pressure sensor 3
1 is not limited to the one attached to the line 29, and it is sufficient that the pressure sensor 31 can detect the torque converter input pressure P _TR .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a torque converter of an automatic transmission according to an embodiment and a hydraulic circuit portion in the vicinity thereof.

FIG. 2 is a configuration diagram of a portion related to a line pressure setting of a hydraulic circuit of the automatic transmission.

FIG. 3 is a configuration diagram of a control system for output torque detection control and line pressure control of the torque converter of the automatic transmission.

FIG. 4 is a flowchart of line pressure control including the output torque detection control.

FIG. 5 is a diagram of a map in which a capacity coefficient K _P is set.

FIG. 6 is a diagram of a map in which a torque ratio t is set.

FIG. 7 is a diagram showing the relationship between the input torque of the torque converter, the torque converter input pressure, and the torque ratio in the prior art.

[Explanation of symbols]

 1 Torque Converter 15 Pressure Regulator Valve 16 Duty Solenoid Valve 31 Pressure Sensor 32 Turbine Speed Sensor 33 Engine Speed Sensor

Claims (3)

[Claims] 1. An output torque detecting device for detecting an output torque of a torque converter, comprising: input torque detecting means for detecting an input torque to the torque converter; and operating pressure detecting means for detecting an operating pressure of the torque converter. Output torque detecting means for obtaining a torque ratio based on the input torque detected by the torque detecting means and the operating pressure detected by the operating pressure detecting means, and detecting the output torque based on the torque ratio and the input torque. An output torque detection device for a torque converter, comprising: 2. The torque according to claim 1, wherein the input torque detecting means is configured to detect the input torque via a speed ratio of the torque converter and a capacity coefficient of the torque converter. Converter output torque detection device. 3. A line pressure control device for a hydraulic circuit of a hydraulically operated automatic transmission, comprising: input torque detecting means for detecting an input torque to a torque converter; and operating pressure detecting means for detecting an operating pressure of the torque converter. , An output torque detection for detecting a torque ratio based on the input torque detected by the torque detection means and the operating pressure detected by the operating pressure detection means, and detecting the output torque based on the torque ratio and the input torque A line pressure control device comprising: means and a line pressure control means for controlling the line pressure based on the output torque of the torque converter detected by the output torque detection means.