JPH06117527A - Automatic transmission controller - Google Patents

Abstract

PURPOSE:To eliminate a shock and a feeling of physical disorder during changing a gear by deciding a speed level employing an accelerator opening, which reflects the change gear position by a driver, as a parameter, and controlling a transmission oil pressure employing a throttle opening, which reflects engine output, as a parameter. CONSTITUTION:An automatic transmission controller is provided with a rotational frequency sensor 5 detecting a turbine rotation speed R which corresponds to a transmission input rotational frequency for a transmission 2, a vehicle speed sensor 6 detecting a vehicle speed V which corresponds to the output rotational frequency of the transmission 2, and a throttle valve opening sensor 9 detecting an opening theta of a throttle valve 7 whose open-close is operated by an accelerator pedal 8, and the output signals from these sensors are inputted to a transmission control part 10. A transmission control signal CN, by which the speed level decided on the basis of an accelerator opening alpha and a vehicle speed V is established, is generated by a speed level determining means 13A, while a transmission oil pressure control signal CP is generated on the basis of the throttle opening theta and the turbine rotational speed R by a transmission oil pressure control means 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission control device for an automobile, and more particularly to an automatic transmission control device that suppresses shock and discomfort during a shift by a shift that reflects the driver's intention.

[0002]

2. Description of the Related Art Conventionally, in an automatic transmission control device that electronically controls an automatic transmission using a microcomputer, a shift timing control for determining a shift point of a transmission, that is, a shift stage, and a clutch pressure during a shift are provided. (Shift hydraulic pressure) control is being performed.

As a concrete example, "Mitsubishi Heavy Industries Technical Report, No. 21
Vol. 1, No. 1 (1984-1) ", the shift timing is controlled using the throttle opening and the vehicle speed, and the duty of the shift hydraulic control solenoid is changed according to the throttle opening. A device for controlling a shift hydraulic pressure is known.

FIG. 3 is a block diagram showing a conventional automatic transmission control device. In the figure, reference numeral 1 is an engine for driving a vehicle. Reference numeral 2 denotes an automatic transmission, that is, a transmission, which is connected to a rotating shaft of the engine 1, and is configured to automatically shift the driving force of the engine 1 to a predetermined shift speed and transmit it to the wheels.

Reference numerals 3 and 4 are solenoids provided to drive and control the transmission 2, and reference numeral 3 is a shift solenoid for determining the gear stage of the transmission 2.
Reference numeral 4 is a hydraulic control solenoid that determines the hydraulic pressure at the time of shifting. Reference numeral 5 is a rotation speed sensor for detecting a turbine rotation speed R corresponding to the transmission input rotation speed of the transmission 2, and 6 is a vehicle speed sensor for detecting a vehicle speed V corresponding to the output rotation speed of the transmission 2.

Reference numeral 7 is a throttle valve for controlling the amount of intake air to the engine 1, 8 is an accelerator pedal operated by a driver, and these are mechanically interlocked via a wire. The throttle valve 7 is opened and closed by operating the accelerator pedal 8 (depressed or returned) by the driver's intention, and determines the engine output. A throttle opening sensor 9 detects the throttle opening θ of the throttle valve 5.

A transmission control unit 10 controls the transmission 2 based on the turbine speed R, the vehicle speed V, and the throttle opening θ, and outputs a shift control signal CN to the shift solenoid 3 based on the vehicle speed V and the throttle opening θ. The shift speed determining means 13 for generating the shift speed and the shift hydraulic pressure control means 14 for generating a hydraulic control signal CP for the hydraulic control solenoid 4 based on the turbine rotation speed R and the throttle rotation speed θ are provided.

Reference numeral 21 is an idle speed control means for automatically controlling the engine speed during idling, 22 is a constant speed travel control means for automatically controlling the engine speed during constant speed travel, and 23 is a slip prevention during constant speed travel. In order to do so, it is a traction control means for automatically controlling the engine speed, and these constitute an engine control means for feedback controlling the opening degree θ of the throttle valve 7 according to the operating state of the engine 1.

Next, the operation of the transmission control unit 10 in the conventional automatic transmission control device shown in FIG. 3 will be described with reference to the flowchart of FIG. First, the throttle opening θ is read from the throttle opening sensor 9 (step S1), the vehicle speed V and the turbine speed R are measured from the vehicle speed sensor 6 and the rotation speed sensor 5 (step S2), and the throttle opening θ and the vehicle speed are measured. Based on V, the gear stage to be currently set is determined (step S3).

Subsequently, it is determined whether or not the gear shift should be further changed from the current gear (step S4). If there is no need for gear shift and the gear can be kept at the current gear, the process is ended. At this time, the shift control signal CN and the shift hydraulic pressure control signal CP corresponding to the control change amount of the transmission 2 are not generated, and the shift solenoid 3 and the hydraulic control solenoid 4 continue the current control state, so that the clutch pressure does not change. .

On the other hand, if it is determined in step S4 that a gear shift is necessary, the gear shift stage determination means 13A
A shift speed control signal C based on the throttle opening θ and the vehicle speed V
N is generated (step S5), the shift hydraulic pressure control means 14 generates a shift hydraulic pressure control signal CP based on the throttle opening θ and the turbine rotational speed R (step S6), and the control routine of FIG. 4 is ended.

Incidentally, the shift hydraulic pressure control signal CP is generated with a deviation due to the change of the shift stage. As described above, when shifting the vehicle based on the throttle opening θ, no problem occurs if the throttle opening θ reflects the driver's will and the predicted output torque (engine output) of the engine 1. Absent.

However, in recent years, as shown in the figure, automatic control means such as idle speed control means 21, constant speed traveling control means 22 and traction control means 23 are used in auto cruising and the like, so the throttle opening θ Is
It can be changed by the engine control means 21 to 23 without opening and closing the accelerator pedal 8.

For example, in the case of constant speed traveling by the constant speed traveling control means 22, the gear shift stage determining means 13 shifts gears based on the vehicle speed V and the throttle opening θ as shown in FIG. 5 in the gear shift stage determining step S3. Although the stage is determined, the boundary throttle opening may be exceeded during automatic control.

FIG. 5 shows a case of switching between a high speed stage and a constant speed stage, where Vo is a set vehicle speed during idling and Vm.
Is the maximum value of the set vehicle speed. Further, the shift speed determined with respect to the vehicle speed V and the throttle opening θ changes from the high speed to the low speed when the throttle opening θ increases with respect to the set vehicle speed V, and from the high speed when the vehicle speed V increases. The boundary throttle opening θ that switches to the low speed increases.

In this way, the vehicle speed V is automatically controlled to the set value, but during the constant speed control, the traction control means 23 also functions to prevent slip, and for example, when the vehicle is controlled at the low speed stage, the slip occurs. When the vehicle speed V suddenly increases due to the occurrence of, the traction control means 23 decreases the throttle opening θ (see arrow a) in order to reduce the torque and prevent slip. Therefore, at this time, there is a possibility that the boundary throttle opening of FIG.

On the contrary, when the traction control unit 23 increases the throttle opening θ (see the arrow b), there is a possibility that the high speed stage shifts to the low speed stage. That is, even if the driver does not operate the accelerator pedal 8, the shift speed is automatically changed against the intention.

[0018]

As described above, since the conventional automatic transmission control device determines the shift speed based on the throttle opening θ, the throttle opening is performed during automatic engine control such as constant speed running. If the degree θ is changed, there is a problem that a shift that is not intended by the driver is likely to occur, which gives the driver a shock or a feeling of strangeness.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an automatic transmission control device which suppresses shock and discomfort during shifting.

[0020]

An automatic transmission control device according to the present invention is provided with an accelerator opening sensor for detecting an accelerator opening of an accelerator pedal, and a gear position determining means in a transmission control section sets the accelerator opening as a parameter. The gear shift hydraulic pressure control means controls the gear shift hydraulic pressure using the throttle opening as a parameter.

[0021]

According to the present invention, the throttle opening degree reflecting the engine output and the accelerator opening degree reflecting the driver's intention of shifting are taken in, the gear stage is determined according to the accelerator opening degree, and the throttle opening degree is determined according to the throttle opening degree. To determine the shift hydraulic pressure.

[0022]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a first embodiment of the present invention,
1-9, 14 and 21-23 are the same as above. or,
Reference characters 10A and 13A correspond to the transmission control unit 10 and the shift speed determination unit 13, respectively.

Reference numeral 30 is an accelerator opening sensor for detecting the operation amount of the accelerator pedal 8, that is, the accelerator opening α, and the detected accelerator opening α is inputted to the gear stage determining means 13A in the transmission control unit 10A.

In this case, the shift stage determining means 13A generates the shift control signal CN based on the accelerator opening α and the vehicle speed V reflecting the driver's intention, and the shift hydraulic pressure controlling means 14 is also provided.
Generates a shift hydraulic control signal CP based on the throttle opening θ and the turbine speed R reflecting the engine output.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described with reference to the flow chart of FIG. In FIG. 2, S1, S2 and S4 to S6 are the same steps as described above.

First, the step of reading the throttle opening θ
Following S1, the accelerator opening sensor 30
Is read (step S11). Further, following the step S2 of measuring the vehicle speed V and the turbine speed R, the gear shift stage is determined based on the accelerator opening α and the vehicle speed V (step S13).

Thereafter, similarly to the above, the shift determination step S4
And the step S5 of generating the shift control signal CN, and if necessary, the step S6 of generating the shift hydraulic pressure control signal CP.

As a result, the gear stage in the transmission 2 is determined in consideration of the driver's will, so that there is no shock or discomfort during gear shifting. Further, since the shift hydraulic pressure at the time of shifting is determined by reflecting the engine output as in the conventional case, the reliability of the shift operation is not impaired.

[0029]

As described above, according to the present invention, the accelerator opening sensor for detecting the accelerator opening of the accelerator pedal is provided, and the gear shift stage determining means in the transmission control unit reflects the driver's intention to shift. The gear shift stage is determined by using the opening degree as a parameter, and the shift hydraulic pressure control means is configured to control the shift hydraulic pressure by using the throttle opening degree, which reflects the engine output, as a parameter. The control device can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional automatic transmission control device.

FIG. 4 is a flowchart showing an operation of a conventional automatic transmission control device.

FIG. 5 is a characteristic diagram for explaining an engine automatic control operation in a conventional automatic transmission control device.

[Explanation of symbols]

 1 Engine 2 Transmission 7 Throttle Valve 8 Accelerator Pedal 9 Throttle Opening Sensor 10 Transmission Control Unit 13 Gear Shift Determining Means 14 Shift Hydraulic Pressure Controlling Means 22 Constant Speed Running Control Means 23 Traction Controlling Means 30 Accelerator Opening Sensors α Accelerator Opening θ Throttle Opening CN Shift control signal CP Shift hydraulic control signal

Claims (1)

[Claims] 1. An accelerator pedal operated by a driver, a throttle valve which is opened and closed by operating the accelerator pedal to determine an intake amount of an engine, and a throttle opening sensor which detects a throttle opening of the throttle valve. An engine control unit that feedback-controls the throttle opening according to an operating state of the engine; and a transmission control unit that controls a transmission connected to the engine based on the throttle opening, the transmission control unit In an automatic transmission control device including a shift speed determining unit that determines a shift speed of a transmission included in the transmission, and a shift hydraulic pressure control unit that controls a shift hydraulic pressure by the transmission, an accelerator opening of the accelerator pedal is performed. Install an accelerator opening sensor to detect the The shift speed determining means determines the shift speed using the accelerator opening as a parameter, and the shift hydraulic pressure control means controls the shift hydraulic pressure using the throttle opening as a parameter. Machine control device.