JPH04115132A - Characteristic learning apparatus for hydraulic power transmission apparatus in speed changer with hydraulic power transmission apparatus - Google Patents

Abstract

PURPOSE:To make it possible to estimate input torque accurately by inputting the detected output torque and gear ratio of a gear-type speed changer and the input number-of-rotation of a hydraulic power transmission apparatus into a control unit, and operating the characteristics of the hydraulic power transmission apparatus. CONSTITUTION:Solenoid valves 5 undergo duty control with a control unit 7 housing a microcomputer, and speed changing hydraulic oil pressure is controlled. There are various kinds of sensors as follows. An engine speed sensor 10 detects the input number-of-rotation of a torque converter 3 which is a hydraulic power transmission apparatus and connected to the output shaft of an engine 1. A number-of-rotation sensor 11 for the output of the torque converter detects the output number-of-rotation of the torque converter 3. A magnetostriction- type torque sensor 12 which is attached to an output shaft 6 of a gear-type speed changer 4 detects the output torque. A gear-ratio sensor 13 detects the gear ratio of the gear-type speed changer 4. The control unit 7 operates the characteristic value of the torque converter 3 based on the signals inputted from the sensors 10, 11, 12 and 13. The characteristic value corresponding to the speed ratio which is stored in a RAM is corrected and rewritten with the operated characteristic value.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a transmission with a fluid transmission device such as an automatic transmission for automobiles, and is a method for learning characteristic values of the fluid transmission device for the purpose of improving speed change control accuracy. related to a device for

<Prior art> In automatic transmissions and continuously variable transmissions for automobiles, engine output is input to a gear type transmission via a fluid transmission device such as a torque converter or fluid coupling. , speed changes are performed by connecting and releasing speed change elements such as band brakes.

Second, the hydraulic pressure for performing the gear shifting operation is set based on the engine throttle valve opening and vehicle speed for boat fishing, or is originally a value that corresponds to the input torque to the transmission. In fact, it is preferable for tuning purposes when increasing transmission efficiency and reducing shift shock.

For this reason, as disclosed in Japanese Utility Model Application Publication No. 1-69947, the input rotation speed and output rotation speed of the transmission are detected, and a fluid transmission device (torque converter) is determined based on these speed ratios. It has been proposed that the input torque is estimated based on the characteristic value of the hydraulic pressure, and the hydraulic pressure is controlled based on the input torque.

<Problem to be solved by the invention> However, since the characteristics of fluid transmission devices vary from product to product and change over time, it is difficult to accurately estimate the input torque, which can lead to operational problems. Hydraulic control accuracy was impaired.

Also, is it possible to install a torque sensor on the output shaft of the transmission to detect the output torque and estimate the input torque based on that and the gear ratio of the gear type transmission? It was impossible to estimate , either because of the response delay or because it was too large.

The present invention was made in view of such conventional problems, and an object of the present invention is to provide a characteristic learning device of a fluid transmission device in a transmission equipped with a fluid transmission device, which enables accurate estimation of input torque. do.

<Means for Solving the Problems> Therefore, as shown in FIG. 1, the present invention provides a transmission with a fluid transmission device that is configured by connecting a fluid transmission device at the input end and a gear type transmission device at the output side. , a transmission output torque detection means for detecting the output torque of the gear type transmission, a gear ratio detection means for detecting the gear ratio of the gear type transmission, and a transmission input rotation speed detecting means for detecting the input rotation speed of the fluid transmission device. a transmission device output rotation speed detection means for detecting an output rotation speed of the fluid transmission device; and a characteristic for rewritably storing a characteristic value of the fluid transmission device with respect to a speed ratio between the input rotation speed and the output rotation speed. a value storage means, a characteristic value of the fluid transmission device is calculated based on the output torque and gear ratio of the transmission, and an input rotation speed of the fluid transmission device, and the characteristic of the corresponding speed ratio is stored in the characteristic value storage means; and characteristic value learning means for correcting and rewriting values.

Further, the characteristic value learning means may be configured to correct and rewrite the characteristic values only when the gear type transmission is in a non-shifting state and the input rotation speed and the output rotation speed are in a substantially steady state.

<Operation> The characteristic value learning means uses the output torque of the gear type transmission detected by the transmission output torque detection means, the gear ratio of the gear type transmission detected by the gear ratio detection means, and the input rotation speed of the transmission device. A characteristic value of the fluid transmission device is calculated based on the input rotation speed of the fluid transmission device detected by the detection means, and a characteristic value corresponding to the speed ratio stored in the characteristic value storage means based on the calculated characteristic value. Correct and rewrite.

This makes it possible to highly accurately detect variations in transmissions and characteristic values that change over time through learning.
Using this value, the input torque during gear shifting can be estimated with high accuracy, and it can be used to set the hydraulic pressure, etc. Also, in the event of a failure of the output torque detection means, etc., it is possible to estimate the input torque during gear shifting with high accuracy. The input torque at steady state can be estimated using the value.

Furthermore, as mentioned above, during gear shifting, the input torque cannot be accurately detected from the output torque of the transmission (that is why the input torque is estimated from characteristic values). Learning accuracy can be improved by learning the characteristic values only when the number of rotations and the output rotation speed are in a substantially steady state.

<Example> Embodiments of the present invention will be described below based on the drawings.

Referring to FIG. 2, an automatic transmission 2 is provided on the output side of the engine 1. The automatic transmission 2 includes a pump impeller 3a and a turbine impeller 3 interposed on the output side of the engine 1.
The transmission includes a gear type transmission 4 connected via a torque converter 3 consisting of a gear type transmission 4, and an electromagnetic pulp 5 that controls hydraulic pressure for hydraulic actuators such as a forward clutch and a band brake in the gear type transmission 4. Note that 6 is an output shaft of the automatic transmission 2.

The electromagnetic valve 5 is duty-controlled by a control unit 7 with a built-in microcomputer to control the gear shift operating oil pressure.

Signals are input to the control unit 7 from various sensors.

As the various sensors mentioned above, a potentiometer type throttle sensor 9 for detecting the opening degree TVO of the throttle valve 8 of the intake system of the engine I is provided.

Further, an engine rotation speed sensor 10 is provided as a transmission device input rotation speed detection means for detecting the engine rotation speed NE, that is, the input rotation speed (pump rotation speed) of the torque converter 3, which is a fluid transmission device, from the output shaft of the engine 1. It is being

Further, a torque converter output rotation speed sensor 11 is provided as a transmission device output rotation speed detection means for detecting the output rotation speed (turbine rotation speed) NT of the torque converter 3.

Further, a magnetostrictive torque sensor 12 is provided as a transmission output torque detection means that is attached to the output shaft 6 of the gear type transmission 4 and detects the output torque TRQ. still,
Magnetostrictive torque sensors are well known from Japanese Patent Laid-Open No. 64-21255.

In addition, a gear ratio sensor I3 is provided as gear ratio detection means for detecting the gear ratio i of the gear type transmission 4.

Here, the control unit 7 learns the characteristic values of the torque converter 3 according to the present invention and sets the working oil pressure based on the input torque according to the flowchart of FIG.

In step 1 (denoted as Sl in the figure, the same applies hereinafter), the engine rotational speed NEI and the turbine rotational speed NT are read.

In step 2, it is determined whether or not gear shifting is in progress.

If the gear is not being shifted, the process proceeds to step 3, where it is determined whether the rate of change of the engine speed NE is less than or equal to a predetermined value ΔN0.

If the determination in step 3 is YES, that is, if it is determined that the engine rotation is substantially steady, the process proceeds to step 4, where it is determined whether the rate of change of the turbine rotation speed N is equal to or less than a predetermined value ΔNT.

If the determination in step 4 is YES, that is, if it is determined that the rotation is substantially steady, the process advances to step 5 and the current output torque T is determined. and gear ratio i.

In step 6, based on the output torque T0 and the gear ratio i, the input torque (Tahin torque) TT of the transmission,
(=T0/i) is calculated.

In step 7, a speed ratio e (2N T /N E '') between the engine rotation speed N5 and the turbine rotation speed N is calculated.

In step 8, the speed ratio e obtained in step 7 is
Based on this, the characteristic value t・τ of the torque converter 3, which is the product of the torque specific gravity and the manual torque capacity coefficient τ (see Fig. 4 for each characteristic), is stored in the microcomputer's RAM (the basic value and modified value described later). If separate maps are provided, the search is performed from table maps stored in RoM for storing basic values and RAM for storing modified values. Here, a RAM that can freely rewrite and store the data of the characteristic values t and τ constitutes a characteristic value storage means.

In step 9, the input torque T T2 of the transmission is estimated and calculated based on the engine rotation speed N and the speed ratio e using the following equation.

Tt2=t・τ×N0' This input torque estimation method is based on Utility Model Application Publication No. 1-69947.
It is well known by the number etc.

In step 10, the input torque T T l detected in step 6 and the input torque TT2 estimated in step 9 are compared, and the difference between the two is a predetermined value ΔT.

If it is below, it is determined that the torque sensor 12 and the gear ratio sensor 13 are normal, and the process proceeds to step 11, where the operating oil pressure at steady state is determined. is set based on the input torque air detected in step 6.

Next, in step 12, the output torque T. gear ratio i
Based on the engine rotational speed N, the characteristic value t·τ under the relevant operating condition is newly determined using the following equation.

t・τ=T0/(1・N, 2) =TT,/N Step 13 Then, the characteristic value t・τ obtained in step 7 above is
Based on the data of τ, the data of t·τ corresponding to the speed ratio e obtained in step 7 is corrected and rewritten.

The function of steps 12 and 13 above constitutes a characteristic value learning means.

If the difference between the detected input torque air and the estimated input torque TT□ exceeds a predetermined value ΔTA in step 10, it is determined that the torque sensor 12 or gear ratio sensor 13 is abnormal, and the process proceeds to step 14. The steady state operating oil pressure L0 is set based on the input torque air estimated in step 9, and this routine is completed without modifying and rewriting the t·τ.

In addition, at the time of shifting when the judgment in step 2 is YES, or during unsteady operation when either step 3.4 is No, the speed ratio e is obtained in step 15, and after searching for the characteristic values t and τ in step 16. , step 17 estimates and calculates the input torque TT□ using the same calculation formula as step 9, and
8, the operating oil pressure L5 during gear shifting is set based on the estimated input torque TT2.

In this way, the influence of variations in the transmission and changes over time can be avoided even when the input torque of the transmission cannot be detected by the output torque during gear shifting or during unsteady conditions, or even if a torque sensor or other abnormality occurs during steady conditions. Avoided learned characteristic value t・τ
The input torque can be detected with high precision using the input torque, and the hydraulic pressure can be set with high precision using the detected input torque.

In this embodiment, an automatic transmission having a torque converter has been described, but the present invention can be similarly applied to a continuously variable transmission having a fluid coupling.

<Effects of the Invention> As explained above, according to the present invention, the characteristics of the fluid transmission device are learned based on the output torque and gear ratio of the transmission, and the input rotational speed of the fluid transmission device. The input torque used for oil pressure setting etc. can be estimated with high accuracy, and even if an error occurs in the input torque detection based on the output torque detection, the input torque during steady state can be estimated using the characteristic values learned so far. Torque estimation can be performed with high accuracy,
It has features such as being able to perform a fail-safe function.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention in response to complaints, Fig. 2 is a diagram showing the system configuration of an embodiment of the present invention, and Fig. 3 is a diagram showing the torque converter characteristic learning and hydraulic pressure control routine of the same embodiment. 4(A) is a diagram showing the relationship between the torque ratio and the input torque capacity coefficient with respect to the speed ratio of the torque converter, and FIG. 4(B) is a diagram showing the relationship between the torque ratio and the input torque capacity coefficient with respect to the speed ratio. FIG. 3 is a diagram showing a relationship between characteristic values expressed as a product. 1...Engine 2...Automatic transmission 3...
Torque converter 4...Gear type transmission 7...
・Control unit 10... Engine speed sensor IJ... Torque converter output speed sensor 12.
...Torque sensor 13...Gear ratio sensor Patent applicant Japan Electronics Co., Ltd. Agent Patent attorney Fujio Sasashima Diagram 2 First oil pressure

Claims (2)

[Claims] (1) In a transmission with a fluid transmission device configured by connecting a fluid transmission device on the input side and a gear type transmission on the output side, a transmission output torque detection means for detecting the output torque of the gear type transmission; , gear ratio detection means for detecting the gear ratio of the gear type transmission; transmission device input rotation speed detection means for detecting the input rotation speed of the fluid transmission device; and transmission device output rotation speed detection means for detecting the output rotation speed of the fluid transmission device. a characteristic value storage means for rewritably storing a characteristic value of the fluid transmission device with respect to the speed ratio between the input rotation speed and the output rotation speed; and characteristic value learning means for calculating a characteristic value of the fluid transmission device based on the input rotation speed and correcting and rewriting the characteristic value of the corresponding speed ratio stored in the characteristic value storage means. A characteristic learning device for a fluid transmission in a transmission with a fluid transmission, characterized by: (2) The characteristic value learning means corrects and rewrites the characteristic values only when the gear type transmission is in a non-shifting state and the input rotation speed and the output rotation speed are in a substantially steady state. A characteristic learning device for a fluid transmission in a transmission with a fluid transmission.