JPH0814380A - Control device for automatic transmission for vehicle - Google Patents

Abstract

(57) [Summary] [Problem] An object of the present invention is to make a reliable shift determination and prevent deterioration of acceleration performance and climbing performance when the throttle opening detection means fails. Therefore, a vehicle speed detecting means for detecting a vehicle speed and a throttle opening degree detecting means for detecting a throttle opening degree of a throttle valve are provided, and a detection signal from these detecting means is inputted and a shift judgment is made by a map to shift gears. In a control device for an automatic transmission for a vehicle having control means for controlling, an engine speed detecting means for detecting an engine speed is provided, and a detection signal from the vehicle speed detecting means and an engine speed detection are provided when the throttle opening detecting means fails. The control means is provided with a function of making a shift judgment based on a detection signal from the means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission for a vehicle, and more particularly to a control device for an automatic transmission for a vehicle which prevents deterioration of acceleration performance and climbing performance when the throttle opening detecting means fails. .

[0002]

2. Description of the Related Art A vehicle is equipped with an automatic transmission or a manual transmission in order to convert the driving force of an internal combustion engine mounted on the vehicle into a desired one in accordance with a driving condition.

In some automatic transmissions (automatic transmissions, ATs), a shift map consisting of engine speed and throttle opening is set and shift control is performed using this shift map.

As a control device for the automatic transmission for a vehicle, there is one disclosed in Japanese Patent Laid-Open No. 62-62045. The electronic automatic transmission disclosed in this publication determines a target shift position based on a throttle sensor, a vehicle speed sensor, a vehicle speed detected by the vehicle speed sensor, and a throttle opening detected by the throttle sensor. 1 shift position determining means, an engine speed sensor,
An intake pipe negative pressure sensor, a throttle opening estimation means for estimating a throttle opening from an intake pipe negative pressure detected by the intake pipe negative pressure sensor and an engine speed detected by an engine speed sensor, and a throttle opening Second shift position determining means for determining a target shift position based on the estimated throttle opening estimated by the estimating means and the vehicle speed detected by the vehicle speed sensor, and a failure detecting means for detecting the presence or absence of a failure of the throttle sensor. Selecting means for selecting a shift position to be used for control from among the determined shift position of the first shift position determining means and the determined shift position of the second shift position determining means, according to the detection result of the failure detecting means, Shift control means for controlling an actuator for driving the transmission so that the shift position of the transmission coincides with the shift position selected by the selecting means. When a failure of Torusensa to continue the automatic shifting control of the transmission to the extent sufficient for practical use, has secured driving performance of evacuation travel, and the like.

Further, there is one disclosed in JP-A-1-172038. A fail-safe control device for an electronically controlled automatic transmission disclosed in this publication is a transmission (T /
M) A new T / M with an output speed sensor
An input rotation speed sensor is provided so that when the gear change judgment (downshift) based on the throttle opening, vehicle speed, etc. occurs, T / M
The vehicle speed calculated by the input speed sensor is compared with the vehicle speed at which the engine overruns due to the gear shift to detect an error in the gear shift determination.

Further, there is one disclosed in Japanese Patent Laid-Open No. 3-194262. The shift control device for an automatic transmission disclosed in this publication detects an abnormality in the throttle sensor and an engine load other than the throttle valve opening when the throttle sensor is detected to be abnormal. The throttle valve opening estimation means for estimating the throttle valve opening based on the engine load detected by the engine load detection means and the engine rotation speed detected by the engine rotation speed detection means is provided, and when the throttle sensor is abnormal, The configuration is such that the shift position of the automatic transmission is controlled based on the estimated throttle valve opening and the vehicle speed, and highly accurate fail-safe control is performed.

[0007]

By the way, in the conventional control device for an automatic transmission for a vehicle, when the throttle opening sensor, which is the throttle opening detecting means, fails, it is determined that the throttle is fully closed, and the throttle is completely closed. The shift was judged in the closed state.

At this time, by making a shift determination in the fully closed state of the throttle, even if acceleration is performed with the throttle opening fully opened, there is no shift up early or kick down, and good acceleration performance is obtained. However, there is an inconvenience that it is disadvantageous in practical use.

Further, when climbing a slope, the speed is extremely reduced, so that the climbing performance is deteriorated and the usability is poor.

[0010]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention has a vehicle speed detecting means for detecting a vehicle speed and a throttle opening degree detecting means for detecting a throttle opening degree of a throttle valve. In a control device for an automatic transmission for a vehicle, which has a control means for inputting a detection signal from a detecting means and determining a shift based on a map to control a shift, an engine speed detecting means for detecting an engine speed is provided, and the throttle opening is performed. When the degree detecting means is out of order, the control means is additionally provided with a function of making a shift determination by a detection signal from the vehicle speed detecting means and a detection signal from the engine speed detecting means.

[0011]

According to the invention as described above, when the throttle opening detecting means is out of order, the control means makes a shift decision based on the detection signal from the vehicle speed detecting means and the detection signal from the engine speed detecting means, thereby accelerating performance and acceleration. It prevents the climbing performance from decreasing.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 9 show a first embodiment of the present invention. In FIG. 2, 2 is an engine mounted on a vehicle (not shown), 4 is a torque converter connected to the engine 2, 6 is a transmission, and 8 is a final gear.

The engine 2 is provided with a throttle opening sensor 10 which is a throttle opening detecting means for detecting a throttle opening of a throttle valve (not shown).
A vacuum diaphragm 12 is provided.

Further, the torque converter 4 is provided with a rotation speed sensor 14 which is an engine rotation speed detecting means for detecting an engine rotation speed, and an oil pump 16 is connected thereto. Further, the transmission 6 is provided with a servo mechanism 18.

At this time, the torque converter 4, the vacuum diaphragm 12, the oil pump 16, and the servo mechanism 18 are connected to the hydraulic control device 20, respectively.

The final gear 8 is provided with a vehicle speed sensor 22 which is a vehicle speed detecting means for detecting the vehicle speed.

The throttle opening sensor 10 and the rotation speed sensor 14, the first solenoid 24 which is the solenoid A communicating with the hydraulic control device 20, the second solenoid 26 which is the solenoid B communicating with the hydraulic control device 20, and the vehicle speed sensor 22. An oil temperature sensor 28 for detecting the oil temperature in the transmission 6, a shift switch 30 for detecting the position of a shift lever (not shown), and an air conditioner (not shown) ON / OFF.
The air conditioner switches 32 are connected to the control means 34, respectively.

The control means 34 receives the detection signals from the vehicle speed sensor 22 which is the vehicle speed detecting means and the throttle opening sensor 10 which is the throttle opening detecting means, and determines the shift by the map to control the shift.

When the throttle opening sensor 10 serving as the throttle opening detecting means fails, the detection signal from the vehicle speed sensor 22 serving as the vehicle speed detecting means and the detection signal from the rotation speed sensor 14 serving as the engine speed detecting means are used. The control unit 34 is additionally provided with a function of making a shift determination.

More specifically, the rotational speed difference between the input rotational speed and the output rotational speed of the torque converter 4 is obtained, and this rotational speed difference is used as a substitute for the detection signal from the throttle opening sensor 10. . That is, the torque converter 4 transmits power using fluid, and slips, that is, the input rotation speed and the output rotation speed of the torque converter 4 differ according to the magnitude of the torque to be transmitted. At this time, the slippage increases as the torque increases, and the torque value depends on the throttle opening of a throttle valve (not shown).

The detection signal from the rotation speed sensor 14 is used as the input rotation speed of the torque converter 4, and the output rotation speed of the torque converter 4 is determined by the detection signal from the vehicle speed sensor 22 and the gear of the shift stage at this vehicle speed. Calculated by the ratio and.

Further, in the system having the input shaft rotational speed detecting means, the input shaft rotational speed detection signal from the rotational speed detecting means can be used as the output rotational speed of the torque converter 4.

The rotational speed difference between the input rotational speed and the output rotational speed of the torque converter 4 has a relationship with the throttle opening as shown in FIG. 5, and the throttle opening is the input rotational speed and output rotational speed of the torque converter 4. It is possible to estimate from the difference in the number of revolutions between

As a measure for estimating the throttle opening, a map of the output rotational speed and the rotational speed difference of the torque converter 4 is created from the relationship of FIG. 5, the throttle opening is calculated by interpolation, and the estimated throttle opening is calculated. The shift determination is performed based on the vehicle speed.

That is, the throttle opening sensor 10
In the normal state where no malfunction occurs, the gear shift judgment is performed based on the vehicle speed and the throttle opening as shown in FIG. 3. When the throttle opening sensor 10 fails, as shown in FIG. 4, it is estimated from the vehicle speed and the engine speed. The gear shift is determined based on the throttle opening.

Further, a map for making the shift judgment is disclosed in FIG.

Further, as a reference, the relationship between the engine speed (input speed of the torque converter) and the output speed of the torque converter when the throttle is fully opened and when the throttle is fully closed is disclosed in FIG. 9 and FIG. 9 disclose shift characteristics.

Next, the operation will be described with reference to the control flowchart of the control device for the automatic transmission for a vehicle shown in FIG.

A control program is started (100) when the engine 2 mounted on a vehicle (not shown) is driven.

When the control program is started (100), it is first judged (102) whether or not the throttle opening sensor 10 is out of order. If the judgment (102) is YES, the torque converter 4 is operated. The output rotation speed calculation process (104), and the determination (102) is NO.
In the case of, it is moved to the end (112).

Further, in the output rotation speed calculation processing (104) of the torque converter 4, the output rotation speed of the torque converter 4 is calculated from the detection signal from the vehicle speed sensor 22 and the gear ratio of the shift stage at this vehicle speed, After the output rotation speed calculation processing (104) of the torque converter 4, a rotation speed difference calculation processing (106) is performed based on the input rotation speed and the output rotation speed of the torque converter 4, and the throttle opening is estimated from the map of FIG. (108) is performed.

Then, a shift judgment (110) is made from the map of FIG. 6 based on the vehicle speed and the estimated throttle opening, and the control program is ended (112).

As a result, the control means 34 can make a reliable shift determination based on the detection signal from the vehicle speed sensor 22 and the detection signal from the rotation speed sensor 14, and the acceleration performance when the throttle opening sensor 10 fails. It is possible to prevent a decline in climbing performance and is practically advantageous.

Further, the throttle opening is estimated from the rotational speed difference between the input rotational speed and the output rotational speed of the torque converter 4, and the shift is judged based on the estimated throttle opening and the vehicle speed. It is possible to improve the property.

Further, since it can be dealt with only by changing the control program in the control means 34, there is no fear of complicating the structure, the manufacture is easy, the cost can be kept low, and it is economical. Is advantageous to.

10 to 12 show a second embodiment of the present invention. In the second embodiment, the portions having the same functions as those of the first embodiment will be described with the same reference numerals.

The feature of the second embodiment is that the gear shift is determined by using the gear shift map of the vehicle speed and the engine speed without estimating the throttle opening.

That is, when the throttle opening sensor is out of order, as shown in FIG. 11, the vehicle speed based on the detection signal from the vehicle speed sensor and the engine speed based on the detection signal from the speed sensor are input, and a preset shift map is entered. The shift judgment is performed at.

Further, the control will be described with reference to the control flow chart of the control device for the automatic transmission for vehicle shown in FIG.

A control program is started (200) when an engine mounted on a vehicle (not shown) is driven.

When the control program starts (200), it is first judged (202) whether or not the throttle opening sensor is out of order, and this judgment (202) is NO.
In the case of, the shift is made to the shift determination (204) based on the shift map of the throttle opening and the vehicle speed, and when the determination (202) is YES, the shift determination based on the shift map of the engine speed and the vehicle speed ( 206).

Then, each shift judgment (204 and 206)
After that, the process moves to the end (208).

Therefore, when the throttle opening sensor is out of order, the shift can be determined based on the shift map of the engine speed and the vehicle speed, and the detection signal from the throttle opening sensor is not required, and the reliable shift determination can be made. It is possible to improve the reliability of the judgment.

Further, in the control program, it is possible to deal with the problem by simply setting the shift map of the engine speed and the vehicle speed in addition to the shift map of the throttle opening and the vehicle speed, thereby complicating the structure. In addition, it is easy to manufacture, the cost can be kept low, and it is economically advantageous.

The present invention is not limited to the first and second embodiments described above, and various application modifications are possible.

For example, in the first and second embodiments of the present invention, the control device for the automatic transmission for a vehicle having the throttle opening sensor has been described. However, in addition to the throttle opening sensor, the intake pipe internal pressure of the engine is controlled. It is also possible to correspond to a system in which a pressure sensor for detecting is provided and a shift determination is made by a detection signal from this pressure sensor.

[0048]

As described in detail above, according to the present invention, the vehicle speed detecting means for detecting the vehicle speed and the throttle opening degree detecting means for detecting the throttle opening degree of the throttle valve are provided, and the detection signals from these detecting means are provided. In a control device for an automatic transmission for a vehicle having a control means for determining a shift based on a map by inputting a shift, an engine speed detecting means for detecting an engine speed is provided, and a vehicle speed is detected when the throttle opening detecting means fails. Since the control means is additionally provided with the function of making a shift determination by the detection signal from the detection means and the detection signal from the engine speed detection means, the control means has the detection signal from the vehicle speed detection means and the engine speed detection means. It is possible to make a reliable gear change judgment based on the detection signal from the vehicle, and to improve the acceleration performance and climbability when the throttle opening detection means fails. The reduction of obtained prevented, which is advantageous in practical use. Further, since it is possible to deal with it only by changing the control program in the control means, there is no fear of complicating the structure, the manufacturing is easy, the cost can be kept low, and it is economically advantageous. .

Furthermore, when the throttle opening sensor fails,
If the gear shift judgment is made by using the shift map of the vehicle speed and the engine speed without estimating the throttle opening, it is possible to make a reliable shift judgment without requiring the detection signal from the throttle opening sensor. , The reliability of judgment can be improved. Further, in the control program, it is possible to deal with it only by setting the shift map of the engine speed and the vehicle speed in addition to the shift map of the throttle opening and the vehicle speed, so that the configuration does not become complicated, However, the cost can be kept low and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a control flowchart of a control device for an automatic transmission for a vehicle showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a control device for an automatic transmission for a vehicle.

FIG. 3 is a diagram showing a gear shift determination in a normal state in which a throttle opening sensor has no malfunction.

FIG. 4 is a diagram showing a gear shift determination when a throttle opening sensor malfunctions.

FIG. 5 is a diagram showing a relationship between a torque converter output rotational speed and a rotational speed difference.

FIG. 6 is a diagram showing a shift determination map.

FIG. 7 is a diagram showing a relationship between an engine speed (torque converter input speed) and a torque converter output speed.

FIG. 8 is a diagram showing the relationship between throttle opening and vehicle speed.

FIG. 9 is a diagram showing a relationship between throttle opening and shift.

FIG. 10 is a control flow chart of a control device for an automatic transmission for a vehicle showing a second embodiment of the present invention.

FIG. 11 is a diagram showing a gear shift determination when the throttle opening sensor is out of order.

FIG. 12 is a diagram showing a shift determination map.

[Explanation of Codes] 2 Engine 4 Torque Converter 6 Transmission 8 Final Gear 10 Throttle Opening Sensor 12 Vacuum Diaphragm 14 Rotation Speed Sensor 16 Oil Pump 18 Servo Mechanism 20 Hydraulic Control Device 22 Vehicle Speed Sensor 24 First Solenoid 26 Second Solenoid 28 Oil temperature sensor 30 Shift switch 32 Air conditioner switch 34 Control means

Claims (1)

[Claims] 1. A shift control is provided which has a vehicle speed detecting means for detecting a vehicle speed and a throttle opening detecting means for detecting a throttle opening of a throttle valve, and inputs a detection signal from these detecting means to make a shift judgment by a map. In a control device for an automatic transmission for a vehicle having a control means for controlling the engine speed, an engine speed detecting means for detecting an engine speed is provided, and a detection signal from the vehicle speed detecting means and an engine speed when the throttle opening detecting means fails. A control device for an automatic transmission for a vehicle, wherein the control means is provided with a function of making a shift determination based on a detection signal from the detection means.