JPS6081561A - Control device of continuously variable transmission - Google Patents

Abstract

PURPOSE:To enable the running as usual by a method wherein an abnormal condition or defect detecting instrument is connected to an engine cooling water temperature sensor, and an engine is shifted to the target speed engine speed or the target speed change ratio while abnormal condition when an abnormal condition is detected. CONSTITUTION:The abnormal condition or defect detecting instrument 42 of the cooling water temperature sensor is connected to the engine cooling water temperature sensor 36, and the target engine speed or the target speed change ratio is shifted to the abnormal condition when an abnormal condition or defect of the engine cooling water temperature sensor 36. Herewith, the running of the vehicle can be continued without deteriorating the fuel consumption, even if an abnormal condition or defect occured.

Description

[Detailed description of the invention] (b) Technical field The present invention relates to a control device for a continuously variable transmission.

(b) Prior art The present applicant, in Japanese Patent Application No. 57-83928,
The control trace of the continuously variable transmission as shown in the figure was disclosed. This control device for a continuously variable transmission has a target engine rotational speed determination means 10, and the target engine rotational speed determination means 10 includes an engine load sensor 12 and a vehicle speed sensor 14.
and a signal from the engine coolant temperature sensor 16. ]” The target engine rotation speed determining means 10 determines the target engine rotation speed based on these signals>i! L
, outputs a target engine rotational speed signal to the shift control means 18. The speed change control means 18 matches the actual engine rotation speed to the target engine rotation speed based on 1] the pillow engine rotation speed signal and the signal indicating the actual engine rotation speed input from the engine rotation speed sensor 20; A shift command signal is sent to the shift actuator 22 to instruct the shift actuator 22 to
Output to.

By operating the speed change actuator 22, the speed ratio of the continuously variable transmission 24 is controlled, and changes to match the actual engine speed or the target engine speed. The target engine rotation speed determined by the target engine rotation speed determination means 10 is determined by the engine rotation speed determined by the target engine rotation speed determination means 10 when the engine is warmed up and reaches a steady state where engine cooling water temperature <r')i is constant. The engine speed is determined so that the engine can be operated with the lowest fuel consumption. On the other hand, in a state where the engine cooling water temperature is low, such as immediately after the engine is started, the target engine rotational speed is set high depending on the degree of lowness of the engine cooling water temperature. This is to prevent the engine from stopping or generating vibrations when the vehicle is running before it is warmed up.

However, since the rotation speed was determined by the control device of the continuously variable transmission as described above, if an abnormality or failure occurred in the engine coolant temperature sensor, the target engine rotation speed would be set to an abnormally high value. or the target engine speed cannot be determined.
There was a possibility that a sudden change in engine speed, deterioration of fuel efficiency, or even an inability to drive could occur. This means that the speed change control means 18 is controlled based on the actual speed ratio and the target speed ratio so that the speed change ratio is set to an engine rotation speed at which the engine is operated at the lowest fuel consumption under a predetermined engine load state. The same applies to the control configuration.

(c) Purpose of the Invention The purpose of the present invention is to obtain an IJ control device for a continuously variable transmission that enables almost normal running even when a sensor malfunction or failure occurs in the engine cooling water 111. It is said that

(D) Structure of the Invention The first invention of the present application provides means for detecting the occurrence of an abnormality or failure of the engine cooling water temperature sensor, and when the abnormality or failure of the engine cooling water temperature sensor is detected, the target engine rotational speed or The above object is achieved by switching the target gear ratio to the target engine speed or target gear ratio at the time of abnormality. That is, the control device of the first invention includes an engine load sensor for detecting engine load, a vehicle speed sensor for detecting vehicle speed, an engine coolant temperature sensor for detecting engine coolant temperature, and an engine rotation speed for detecting engine rotation speed. The target engine speed or target is determined based on the sensor or the gear ratio sensor that detects the gear ratio, the engine load signal from the engine load sensor, the vehicle speed signal from the 41st speed sensor, and the engine cooling water temperature signal from the engine cold J41 water i1i++t sensor. A target value determining means for determining a gear ratio; and an abnormal target value determining means for determining a target engine rotation speed or a target gear ratio based on an engine load signal from an engine load sensor and a vehicle speed signal from a vehicle speed sensor. A speed change control means for generating a speed change command signal based on a target value signal and an engine speed signal from an engine speed sensor or a speed change ratio signal from a speed ratio sensor, and a speed change operated by a speed change command signal from the speed change control means. The actuator, the cooling water bottle sensor abnormality/failure detection means for detecting abnormality or failure of the engine coolant temperature sensor, and the target value determination when the coolant temperature sensor abnormality/failure detection means do not detect any abnormality or failure of the engine coolant temperature sensor. The target f11 signal from the means is sent to the speed change control means, and 7 is sent to the coolant temperature sensor abnormal/JI & failure detection means. 1'' target value A from A, sending the A bow to the first gear of the speed change control 1'') J mark 47-i!ilJ changing means;
have.

The second invention of the present application also provides a target engine rotational speed at the time of abnormality or Ll from the target engine rotational speed immediately before the abnormality or failure of the engine cooling water temperature sensor is detected or i+tr of the 1:1 target gear ratio. The above objective is achieved by gradually changing the gear ratio to the target gear ratio value over a predetermined delay time. Namely.

The second invention includes an engine load sensor for detecting engine load, a vehicle speed sensor for detecting vehicle speed, an engine coolant temperature sensor for detecting engine coolant temperature, and an engine rotation speed sensor or gear ratio for detecting engine rotation speed. A target value for determining a target engine speed or a target gear ratio based on a gear ratio sensor to be detected, an engine load signal from an engine load sensor, a vehicle speed signal from a vehicle speed sensor, and an engine coolant temperature signal from an engine coolant temperature sensor. a determining means, an abnormality target 4tj determining means for determining a target engine rotational speed or a target gear ratio based on an engine load signal from an engine load sensor and a vehicle speed signal from a vehicle speed sensor, and a given target value signal and engine rotational speed. A speed change control means for generating a speed change command signal based on an engine rotational speed signal from a sensor or a speed change ratio signal from a speed ratio sensor; and a speed change actuator operated by a speed change command signal from the speed change control means. and a cooling water temperature sensor abnormality/failure detection means for detecting an abnormality or failure of the engine cooling water temperature sensor;
When the cooling water temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine cooling water temperature sensor, a predetermined delay time from the immediately previous target value of the target value determination means to the target value of the abnormality target value determination means. The switching relaxation means is capable of outputting a target value signal that changes within a certain period of time and, after a delay time, outputs the target value signal as it is from the abnormal target value determining means, and the cooling water temperature sensor abnormality/failure detection means is used for engine cooling. When an abnormality or failure of the water temperature sensor is not detected, the II target value signal from the +Q determining means is sent to the speed change control means, and when the cooling water temperature sensor abnormality/failure detection means detects an abnormality or failure of the Ikei water temperature sensor. 9
It has 11 mark A 111 switching means for sending the 1-1 target value signal from the J switching relaxation means to the speed change control means.

The third invention of the present application estimates the engine cooling water temperature from the operating state of the engine when an abnormality or failure of the engine cooling water temperature sensor is detected, and adjusts the engine cooling water temperature to the predetermined engine cooling water temperature. The above objective is achieved by subsequently determining a target engine rotational speed or a target gear ratio.

That is, the control device of the third invention includes an engine load sensor for detecting engine load, a vehicle speed sensor for detecting vehicle speed, an engine coolant temperature sensor for detecting engine coolant temperature, and an engine rotation speed for detecting engine rotation speed. Determine the target engine speed or target gear ratio based on a sensor or a gear ratio sensor that detects the gear ratio, an engine load signal from the engine load sensor, a vehicle speed signal from the vehicle speed sensor, and a manually input signal indicating the engine cooling water temperature. a target value determining means for determining the target value, and a shift control means for generating a shift command signal based on the target value signal from the target value determining means and the engine rotation speed signal from the engine rotation speed sensor or the gear ratio signal from the gear ratio sensor;
a speed change actuator operated by a speed change command signal from a speed change control means; a cooling water temperature abnormality/failure detection means for detecting an abnormality or failure μ91 of an engine cooling water temperature sensor;
Engine cooling water temperature estimating means for determining an estimated engine cooling water temperature in response to both or either one of a signal indicating an engine idle rotational speed and a signal indicating an engine intake temperature IW, and engine cooling when the engine cooling water temperature sensor is normal. The engine coolant temperature signal from the water temperature sensor is input to the target value determining means, and when the coolant temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine coolant temperature sensor, the estimated engine coolant temperature signal is input from the engine coolant temperature estimation means. cooling water temperature signal switching means for inputting the temperature signal to the target value determining means.

(e) Examples Examples of the present invention will now be described with reference to FIGS. 2 to 5 of the drawings.

First, an embodiment of the first invention shown in FIG. 2 will be described.

Loquat? Target engine speed method which is a value determining means 'M
The engine load signal 33 from the engine load sensor 32, the vehicle speed signal 35 from the vehicle speed sensor 34, and the engine coolant temperature (M number 37) from the engine coolant temperature sensor 36 are input to -Y1&30.Engine load sensor 32 1 is a sensor that detects, for example, the throttle opening as an electrical signal, the vehicle speed sensor 34 is a sensor that detects the rotational speed of the output shaft of the continuously variable transmission as an electrical signal, and the engine cooling water temperature sensor 36 is a sensor that detects the rotation speed of the output shaft of the continuously variable transmission as an electrical signal. This sensor continuously detects the engine coolant temperature as an electrical signal. The target engine rotation speed determining means 30 is
A target engine speed is determined based on these signals 33, 35 and 37. The target engine rotation speed determined by the target engine rotation speed determining means 30 is a value that minimizes the fuel consumption of the engine in the warm-up completion state where the engine cooling water temperature has risen to a steady state. If the engine speed is lower than the steady value before the warm-up is completed, the engine rotational speed will be higher than the two-legged value depending on the low level. In this way,
The target engine rotation speed % 31 determined by the target engine rotation speed determination means 30 is manually input to the target engine rotation speed switching means 38 . Engine load signal 33 from engine load sensor 32 and vehicle speed sensor 34
The vehicle speed signal 35 is also input to abnormal target engine rotational speed determining means 40 . Abnormality target engine rotational speed determination means 40 determines whether the cooling water temperature sensor is abnormal or not, which will be described later.
When the abnormality/failure signal 43 from the failure detection means 42 is input manually, the target engine rotational speed signal 41 that minimizes fuel consumption is determined based on the aforementioned signals 33 and 35. The target engine rotational speed signal 41 at this abnormal time is also
1'' is input to the engine rotational speed switching means 38. The engine 74 cooling water temperature signal 37 from the engine cooling water temperature sensor 36 is transmitted to the cooling water temperature sensor abnormality/failure detection means 42.
is also entered. When the cooling water temperature sensor error 5/failure detection means 42 detects an abnormality or failure of the engine coolant temperature sensor 36 as described later, the abnormality 1/failure signal 43 is used to determine the engine rotation speed at abnormality 11. Means 4
0, which is output to the target engine rotational speed switching means 38 and the alarm/storage means 44, which will be described later.

The cooling water temperature sensor field/failure detection means 42 detects when the engine cooling water temperature signal 37 changes at a rate of change equal to or higher than a predetermined value, and when the engine cooling water temperature signal 37 detects a low value or a high temperature value that cannot normally be taken. , it is determined that an abnormality or failure has occurred in the engine cooling water temperature sensor 36, and the abnormality/failure is detected.
A failure signal 43 is output. In the above cases, it is determined that an abnormality or failure has occurred because the engine cooling water has a certain heat capacity, so it is impossible for it to rise or fall extremely rapidly. This is because abnormal temperatures such as below -50°C or above 200°C do not normally occur. The alarm/storage means 44 is configured to
When the failure signal 43 is output, the occurrence of the abnormality or failure is notified to the driver by a display device, a buzzer, etc., and the occurrence of the abnormality or failure is stored in a nonvolatile storage device. The target engine rotational speed switching means 38 outputs an abnormality/failure signal 43
is not input, the target engine rotational speed signal 31 is output to the shift control means 46, and the abnormality/failure signal 43 is output.
When inputted, the abnormal target engine rotational speed signal 41 is manually inputted to the shift control means 46. gear change control ill
The f stage 46 is the 1-1 standard engine rotation speed! , the engine rotation speed signal 49 indicating the actual engine rotation speed from the engine rotation speed sensor 48 and the engine rotation speed signal 49 indicating the actual engine rotation speed from the engine rotation speed sensor 48. A shift command signal 47 that matches the rotational speed is output to the shift actuator 50. The speed change actuator 50 operates based on the speed change command signal 47, and changes the speed ratio of the continuously variable transmission 52 as instructed.

After all, with the above-described control, if an abnormality or failure occurs in the engine cooling water temperature sensor 36, the gear ratio of the continuously variable transmission 52 is changed according to the gear change pattern determined by the target engine rotational speed determination means 40 at the time of abnormality. control j'
As a result, the vehicle can continue to run normally even after an abnormality or failure occurs in the engine coolant temperature sensor 36, and the engine speed may become too high, resulting in poor fuel efficiency or becoming unable to drive. Preventing 11
-Can be done.

FIG. 3 shows an embodiment of the fjtJ2 invention of the present application.

The embodiment shown in FIG. 3 is almost the same as the embodiment shown in FIG. 2 except that a switching mitigation means 54 is provided, so the switching mitigation means 54 will be mainly explained, and other details will be explained. The configuration will be designated by the same reference numerals as those of the embodiment shown in FIG. 2, and the explanation will be omitted. The abnormal target engine rotational speed signal 41 from the abnormality target engine rotational speed determination means 40 is not directly input to the target engine rotational speed switching means 38, but is input to the +) J switching mitigation means 5.
4 to form a signal 41', which is then input to the target engine rotation speed F)J conversion means 38. The switching mitigation means 54 receives an engine cooling water temperature signal 37 from the engine cooling water temperature sensor 36, an abnormality/failure signal 43 from the engine cooling water temperature sensor abnormality/failure detection means 42, and a target engine rotation from the target engine rotation speed determining means 30. Speed signal 31
, and an engine rotational speed signal 49 from the engine rotational speed sensor 48 are also input, and the switching relaxation means 54 functions as follows based on these signals. First, when the water temperature value Tb indicated by the engine cooling water temperature signal 37 immediately before the abnormality/failure signal 43 is input is equal to or higher than the predetermined value T1, the abnormal target engine rotation speed is determined from the abnormal condition target engine rotation speed determining means 40. Speed signal 41 as is signal 41
' is output to the target engine rotational speed switching means 38. The above-mentioned predetermined value TI corresponds to the engine cooling water temperature close to the steady state after completion of warm-up, and the fact that the value of Tb is equal to or higher than the value of T1 indicates that the engine has already been warmed up. There is. Therefore, in this case, even if the target engine rotation speed signal 31 is immediately switched to the abnormal target engine rotation speed signal 41 (which is the same as signal 41'), the target engine rotation speed indicated by both signals 31 and 41 is Since the speeds are approximately the same, there is no sudden change in engine speed. Next, if (+r4 T b as described in l'iij is less than the predetermined value TI, set the delay time according to the value of Tb and the engine rotation speed signal 49, and During this period, the signal 41' is gradually changed from the value of the target engine rotation speed signal 31 1 rf before the abnormality/failure signal 43 is output to the value of the target engine rotation speed signal 41 at the time of abnormality. When the cooling water temperature is low and the target engine speed commanded by the speed determining means 30 is high, the engine 76]41 water>g sensor 36
If the target engine rotational speed signal 41 is input to the gear shift ill 1>0 means 46 (the target engine rotational speed signal 41' is immediately switched to the lower target engine rotational speed signal 41), the target engine rotational speed signal 41 Therefore, when the engine is not sufficiently warmed up, it gradually changes to a lower value at l/1.
1. (Even if the fault force is IF L, the engine speed will not change suddenly, and the engine will not vibrate or run out of power.) - The larger the value of Tb, the longer it is, and the longer the difference between the actual engine rotation speed and the target engine rotation speed, the longer it should be set. The value of Tb and the engine rotational speed signal 49) may be set according to the value of Tb (++'i) and the engine load signal 33 or the vehicle speed signal 35. , a certain l/' if T b, and an appropriate combination of the engine rotational speed signal 49, the engine load signal 33, and the vehicle speed signal 35.

After all, the above control not only allows the engine to continue rotating normally even when the engine cooling water temperature sensor 36 is abnormal or malfunctions, but also prevents sudden changes in engine speed at the moment the malfunction occurs. It is also possible to prevent the occurrence of engine vibrations, power shortages, etc.

FIG. 4 shows an embodiment of the third invention according to the present application. In addition, in this FIG. 4, the same reference 1! is used for the same components as in the embodiment shown in No. 21Δ. ζ (symbol is used. In this embodiment, an engine cooling water temperature estimating means 56 and a cooling water temperature A 11 J conversion F depression 58 are provided. The engine cooling water temperature An engine intake temperature signal 59 from the sensor 58 and an abnormality/failure signal 43 from the cooling water temperature sensor abnormality 1θ/failure detection means 42 are input.Engine cooling water temperature estimation means 5
6 does not operate when the abnormality/failure signal 43 is not input. When the abnormality/failure signal 43 is input to the engine cooling water temperature estimating means 56, the engine cooling water temperature is estimated based on the engine intake temperature signal 59, and a signal 57 indicating the estimated engine cooling water temperature is sent to the engine intake temperature sensor. Output to 58. Engine cooling water temperature estimation means 5
The estimation of the engine cooling water temperature in step 6 is performed based on, for example, the characteristics shown in FIG. The characteristics shown in FIG. 5 are set, for example, by experimentally determining the relationship between the engine intake temperature and the engine cooling water temperature.

When the abnormality/failure signal 43 is not input, the engine intake temperature sensor 58 detects the engine cooling water temperature sensor 3.
The engine cooling water temperature signal 37 from 6 is converted into signal 59 as it is.
1” output to the engine rotational speed determination means 30,
Also? When the IU normal/failure signal 43 is manually input, a signal 57 from the engine cooling water temperature estimating means 56 is output to the target engine rotational speed determining means 30. After all, when the engine coolant temperature sensor 36 is abnormal or malfunctions, the signal 57 (signal 59) indicating the engine coolant temperature estimated as described above is input to the target engine rotation speed determining means 30, and the target engine rotation speed determining means 30 is this signal 57
(signal 59) to determine the target engine rotation speed. Since the estimated value of the engine coolant temperature almost corresponds to the actual engine coolant temperature, even if an abnormality or failure occurs in the engine 74y or the coolant temperature sensor 36, the target engine speed will change significantly from the normal (++i) The vehicle can continue to run, fuel efficiency does not deteriorate, and sudden changes in engine speed do not occur.In addition, the engine cooling water is removed before the engine is warmed up. :r!Even if something goes wrong or a malfunction occurs in the sensor 36, engine vibrations, power shortages, etc. will not occur. The estimation of the engine cooling water temperature can be done based on the engine intake temperature, or the engine cooling water temperature can be determined based on the engine idle speed instead of the engine intake temperature. It is also possible to further improve the accuracy of the estimated value by estimating the engine cooling water temperature based on both signals.
In either case, the engine rotation speed is detected by an engine rotation speed sensor, and the target value determination circuit also uses the target engine rotation speed as the target value. The present invention can also achieve the same effects as the above-described embodiments by using a value determining means to control the gear ratio to a target gear ratio at which the engine is operated with the lowest fuel consumption in a predetermined operating state. .

(f) Effects of the invention As explained above, the first invention of Translated by Kieda 1 is:
An engine load sensor that detects engine load, a vehicle speed sensor that detects vehicle speed, an engine coolant temperature sensor that detects engine coolant temperature, and an engine rotation speed sensor that detects engine rotation speed or a gear ratio sensor that detects gear ratio. , target value determining means for determining a target engine speed or a target gear ratio based on an engine load signal from an engine load sensor, a vehicle speed signal from a vehicle speed sensor, and an engine cooling water temperature signal from an engine cooling water temperature sensor; Abnormality 1 in which the target engine rotation speed or target gear ratio is determined based on the engine load signal from the sensor and the vehicle speed signal from the vehicle speed sensor
A target value determining means, a gear change control means for generating a gear change command signal based on a given target value signal and an engine rotation speed signal from an engine rotation speed sensor or a gear ratio signal from a gear ratio sensor, and a gear change control means. The gear shift actuator, which is activated by a gear shift command signal from the When abnormality or failure of the coolant temperature sensor is not detected, the target value signal from the target value determining means is sent to the shift control means 3111, and the coolant temperature sensor abnormality/failure detection means detects the engine coolant 11.
and target value switching means that sends a target value signal from the abnormal target value determination means to the shift control means when abnormality or failure is detected in the engine cooling water temperature sensor. Even if a failure occurs, the vehicle can continue to run without deteriorating fuel efficiency. Further, a second invention of the present application provides an engine load sensor for detecting engine load, a vehicle speed sensor for detecting vehicle speed, an engine coolant temperature sensor for detecting engine coolant temperature, and an engine rotation speed for detecting engine rotation speed. a sensor or a gear ratio sensor that detects the gear ratio;
target value determining means for determining a target engine speed or a target gear ratio based on an engine load signal from an engine load sensor, a vehicle speed signal from a vehicle speed sensor, and an engine cooling water temperature signal from an engine cooling water temperature sensor; , an abnormal target value determining means for determining a target engine speed or a target gear ratio based on an engine load signal from an engine load sensor and a vehicle speed (A) from a vehicle speed sensor; A shift control means 21 generates a shift command signal based on the engine rotational speed signal from the engine rotation speed signal or the gear ratio signal from the gear ratio sensor, a shift actuator operated by the shift command signal from the shift control means, and an engine cooling water temperature sensor. Cooling water temperature sensor abnormality/failure to detect abnormality or failure
When the failure detection means and the cooling water temperature sensor abnormality/failure detection means detect an abnormality or failure of the engine cooling water temperature sensor, a predetermined value is set from the previous target value of the target value determination means to the target value of the abnormality target value determination means. A switching relaxation means capable of outputting a target value signal that changes within the delay time; and a cooling water temperature sensor that can output the target value signal as it is from the abnormality target value (1j) after the delay time of M. When the abnormality φ failure detection means does not detect an abnormality or failure of the engine coolant temperature sensor, the target 4 ft signal from the target value determination means is sent to the shift control means, and the coolant temperature sensor abnormality/II9 failure detection means detects an abnormality or failure of the engine coolant temperature sensor. and a target value switching means that sends a target value signal from the switching mitigation means to the shift control means when an abnormality or failure is detected, so that normal operation can be continued even in the event of an abnormality or failure of the engine coolant temperature sensor. In addition, it is possible to prevent sudden changes in the engine rotational speed at the moment when an abnormality or failure occurs, and it is also possible to prevent engine vibrations, power shortages, etc. The invention includes an engine load sensor that detects engine load, a vehicle speed sensor that detects vehicle speed, an engine coolant temperature sensor that detects engine coolant temperature, and an engine rotation speed sensor that detects engine rotation speed or a gear ratio. 1-point target value determining means for determining a target engine rotation speed or a target gear ratio based on a gear ratio sensor, an engine load signal from an engine load sensor, a vehicle speed signal from a vehicle speed sensor, and a manually input signal indicating engine cooling water temperature; and the target (ir) from the target value determining means
, j signal and an engine rotational speed signal from an engine rotational speed sensor or a gear ratio signal from a gear ratio sensor;
a speed change actuator operated by a speed change command signal from the n means, a cooling water temperature abnormality/failure detection means for detecting abnormality or failure of the engine cooling water temperature sensor, a signal indicating the idle rotation speed of the engine, and a signal indicating the intake air temperature of the engine. engine cooling water temperature estimating means for determining an estimated engine cooling water temperature in response to either or both of the blades;
When the engine coolant temperature sensor is normal, the engine coolant temperature signal from the engine coolant temperature sensor is the target (iei
When the cooling water temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine cooling water temperature sensor, the 411 regular engine cooling water temperature signal from the engine cooling water temperature estimating means is manually input to the target value determining means. Since it has a water temperature signal exchange means, 1. In addition to the effects of the first invention described above, it is possible to prevent sudden changes in engine rotational speed, and also to prevent sudden changes in engine speed, and to prevent abnormalities or other failures in the engine cooling water temperature sensor before the engine is warmed up. Even if this occurs, it is possible to eliminate engine vibrations, power shortages, etc.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional continuously variable transmission control device, FIG. 2 is a diagram showing the relationship between the components of the first (7) invention according to the present application, and FIG. FIG. 4 is a diagram showing the relationship between the components of the third invention according to the present application. FIG. 5 is a diagram showing the characteristics of estimated engine cooling water temperature with respect to engine intake temperature. FIG. 30...Target engine rotation speed speed means (target value determining means), 32...Engine load sensor, 34...
Heavy speed sensor, 36...Engine't% hydraulic i1 sensor, 3B-@-target engine rotation speed switching means (target value switching means), 40...Abnormality target engine rotational speed determination means (abnormality target value determining means), 42... Cooling water temperature sensor abnormality/failure detection means, 44... Alarm/storage means, 46... Speed change control means, 50... Speed change actuator, 52... Continuously variable transmission , 54... Switching relaxation means, 56... Engine cooling water temperature adjustment means, 58.
...Cooling water temperature signal switching means. Figure 5 Engine intake temperature procedure amendment December 21, 1980 Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the incident 1989 Patent Application No. 189374 2, Name of the invention Control device for continuously variable transmission 3 , Relationship with the case of the person making the amendment Patent application Person address 2 Takaracho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Name (name)
(399) IE San Jidosha Co., Ltd. Representative: Shun Ishihara 4, Agent address: 6-5-3-5 Shinbashi, Minato-ku, Tokyo, voluntarily issued on the date of the amendment order 6, Number of inventions increased by the amendment: 0 7 , in the Detailed Description of the Invention column of the specification to be amended, and in Figure 4, Figure 8, and Contents of the Amendment (1) On page 22, line 15 of the specification, the term ``cooling water temperature signal switching means 58J'' has been replaced with ``cooling water temperature signal switching means 58J''. water temperature signal switching means 60". (2) On page 23, line 6 of the specification, the phrase "engine intake temperature sensor 58" is corrected to read "cooling water temperature signal switching means 60." (3) On page 23, line 12 of the specification, replace "engine intake temperature sensor 58" with "cooling water temperature signal switching means 60J".
and correct it. (4) On page 23, line 15 of the specification, "as signal 59 as it is" is corrected to "J as signal 61 as it is." (5) On page 24, line 2 of specification as "signal 57 (signal 59)". ”
is corrected to [signal 57 (signal 61) J. (6) On page 24, line 4 of the specification, “481 No. 57 (Ia stomach 5
9)” is supplemented with “Signal 57 (A1, No. 61).” (7) On page 31, line 19 of the specification, "58O cooling water temperature signal switching means" is corrected to "60...Cooling water temperature signal switching means". (8) The two reference numerals in Figure 4 of the drawing are corrected as indicated in red.

Claims (1)

[Claims] l. - An engine load sensor that detects engine load, a vehicle speed sensor that detects vehicle speed, an engine coolant temperature sensor that detects engine coolant temperature, and an engine rotation speed sensor that detects engine rotation speed, or A target engine speed or a target gear ratio is determined based on a gear ratio sensor that detects the gear ratio, an engine load signal from an engine load sensor, a vehicle speed signal from a vehicle speed sensor, and an engine coolant temperature signal from an engine coolant temperature sensor. a target value determining means; an abnormality target (IFI determining means) for determining a target engine rotational speed or a target gear ratio based on an engine load signal from an engine load sensor and a vehicle speed signal from a vehicle speed sensor; A shift control means for generating a shift command signal based on the signal and an engine rotation speed signal from an engine rotation speed sensor or a gear ratio signal from a gear ratio sensor, and a shift operated by the shift command signal from the shift control means. An actuator, a cooling water temperature sensor abnormality/failure detection means for detecting an abnormality or failure of the engine coolant temperature sensor, and a cooling water temperature sensor abnormality/failure detection means (11) (when the failure detection means does not detect an abnormality or failure of the engine coolant temperature sensor). The target value determination means sends the target (/i times signal to the speed change control means, and when the cooling water temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine cooling water temperature sensor, the signal is sent to the speed change control means.
1. A control device for a continuously variable transmission, comprising: target value switching means for sending a target value signal from target value determining means to transmission control means. 2. Cooling water temperature sensor malfunction//1 fault detection means detects the engine cooling water 1iI detected by the engine cooling water temperature sensor.
If the change in the A count is greater than the predetermined value (+rf), or if the engine coolant temperature signal indicates an impossible engine coolant temperature value, an abnormality or J& fault has occurred in the engine coolant temperature sensor. A control device for a continuously variable transmission according to claims 1+ and r+. 3. An engine load sensor that detects an engine load;
A vehicle speed sensor that detects vehicle speed, an engine coolant temperature sensor that detects engine coolant temperature, an engine rotation speed sensor that detects engine rotation speed or a gear ratio sensor that detects gear ratio, and an engine load signal from an engine load sensor. target value determining means for determining a target engine rotation speed or a target gear ratio based on a vehicle speed signal from a vehicle speed sensor and an engine cooling water interference signal 5 from an engine cooling water temperature sensor; and an engine load signal from an engine load sensor and a vehicle speed sensor. abnormality target value determination means for determining a target engine rotational speed or a target gear ratio based on a vehicle speed signal from the engine rotational speed sensor; a speed change control means that generates a speed change command signal based on the speed change ratio signal; a speed change actuator that operates according to the speed change command signal from the speed change control means; and a cooling water temperature sensor that detects abnormality or failure of the engine cooling water temperature sensor. When the failure detection means and the cooling water temperature sensor abnormality/failure detection means detect an abnormality or failure of the engine cooling water temperature sensor, the immediately preceding target value determination means (+f4 to 1-1 of the abnormal target value determination means) is detected. Mark (
switching relaxation means capable of outputting a target value signal that changes within a predetermined delay time up to fi, and outputting the target value signal as it is from the abnormality target value determination means after the delay time; When the failure detection means does not detect an abnormality or failure of the engine coolant temperature sensor, the target value determination means sends a target (tri signal) to the shift control means, and the coolant temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine coolant temperature sensor. A control device for a continuously variable transmission which, when a failure is detected, sends a target value signal from the switching alleviation means to the shift control means; ,
A vehicle speed sensor that detects vehicle speed, an engine coolant temperature sensor that detects engine coolant temperature, an engine rotation speed sensor that detects engine rotation speed or a gear ratio sensor that detects gear ratio, and an engine load signal from an engine load sensor. Target value determining means for determining a target engine speed or target gear ratio based on a vehicle speed signal from a vehicle speed sensor and a signal indicating an input engine cooling water temperature, and a target value signal from the target value determining means and an engine speed sensor. Abnormalities in the gear change control means that generates a gear change command signal based on the engine rotational speed signal from the engine rotation speed signal or the gear ratio signal from the gear ratio sensor, the gear change actuator that is activated by the gear change command signal from the gear change control means, and the engine cooling water temperature sensor. Or abnormal cooling water temperature to detect failure.
a failure detection means; an engine cooling water temperature M (determining means) for determining an estimated engine cooling water temperature in response to a signal indicating the engine idle speed and/or a signal indicating the engine intake air temperature; When the sensor is normal, the engine coolant temperature signal from the engine coolant temperature sensor is input manually to the target value determining means, and when the coolant temperature sensor abnormality/failure detection means detects an abnormality or failure of the engine coolant temperature sensor, the engine coolant temperature signal is input from the engine coolant temperature estimation means. A control device for a continuously variable transmission, comprising: cooling water temperature signal switching means for inputting an estimated engine cooling water temperature signal to a target value determining means.