Throttle-valve opening degree control for automatic step-wise transmission system

• US 4,930,079 A
• Filed: 06/27/1988
• Issued: 05/29/1990
• Est. Priority Date: 07/02/1987
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kondo, Shigeki
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/212,372
• Time in Patent Office: 701 Days
• Field of Search: 364/559, 364/571.02, 364/571.04, 364/571.05, 364/431, 364/05, 364/431.06, 364/431.07, 364/431.09, 364/424.1, 73/117, 73/117.2, 73/117.3, 73/118.1
• US Class Current: 701/58
• CPC Class Codes: F02D 11/10 of the electric type
• CPC Class Codes: F16H 2061/0087 Adaptive control, e.g. the control parameters adapted by learning
• CPC Class Codes: F16H 59/24 dependent on the throttle opening
• CPC Class Codes: F16H 61/0021 Generation or control of line pressure
• CPC Class Codes: F16H 61/0206 Layout of electro-hydraulic control circuits, e.g. arrangement of valves for control of actuators selecting and moving final output members, e.g. shift forks F16H61/2807

Abstract

To control an automatic step-wise transmission system of a vehicle including a vehicle engine, the controlling steps include:

acquiring real throttle-valve opening degree data of the vehicle engine;

checking whether or not conditions of the vehicle engine are in a start-up status when the real throttle-valve opening degree data is acquired;

calculating a difference between the real throttle-valve opening degree data acquired during the determination of the start-up status and reference throttle-valve opening degree data previously stored so as to obtain a correction value for the real throttle-valve opening degree data;

correcting the real throttle-valve opening degree data based upon the correction value to produce controlling throttle-valve opening degree data; and,

controlling the automatic step-wise transmission system based upon the controlling throttle-valve opening degree data so as to perform a gear-changing operation of the vehicle engine.

Claims

1. A method for regulating an automatic step-wise transmission system of a vehicle including a vehicle engine, comprising the steps of:

sensing real throttle-valve opening degree sensor data of the vehicle engine;

determining whether the vehicle engine is under start-up conditions when said real throttle-valve opening degree sensor data is sensed;

calculating a difference between said real throttle-valve opening degree sensor data sensed under the start-up conditions and reference throttle-valve opening degree data previously stored so as to obtain a correction value for said real throttle-valve opening degree sensor data;

correcting said real throttle-valve opening degree data by adding said correction value to produce controlling throttle-valve opening degree data; and

controlling the automatic step-wise transmission system by inputting said controlling throttle-valve opening degree data to as to produce a gear-changing control signal and to perform a gear-changing operation of the vehicle engine;

wherein said determining step further includes the steps of;

determining whether an engine speed of the vehicle engine is within a predetermined engine speed range;

determining whether a plurality of said sensed real throttle-valve opening degree sensor data contained fluctuation; and

determining whether the engine is in an idling operation state by comparing said real throttle valve opening degree sensor data and said reference throttle valve opening degree data.

2. A method for controlling an automatic step-wise transmission system of a vehicle including a vehicle engine as claimed in claim 1, wherein said determining step further includes the steps of:

determining whether an engine changing gear is in a neutral position;

determinig whether a water temperature of the vehicle engine exceeds a predetermined temperature; and

,

determining whether the vehicle engine is being subjected to a load.

3. A method for regulating an automatic step-wise transmission system of a vehicle including a vehicle engine, comprising the steps of:

sensing real throttle-valve opening degree sensor data of the vehicle engine;

determining whether the vehicle engine is under start-up conditions when said real throttle-valve opening degree sensor data is sensed;

calculating a difference between said real throttle-valve opening degree sensor data sensed under the start-up conditions and reference throttle-valve opening degree data previously stored so as to obtain a correction value for said real throttle-valve opening degree sensor data;

correcting said real throttle-valve opening degree data by adding said correction value to produce controlling throttle-valve opening degree data; and

controlling the automatic step-wise transmission system by inputting said controlling throttle-valve opening degree data so as to produce a gear-changing control signal and to perform a gear-changing operation of the vehicle engine, wherein said automatic vehicle transmission system regulating step includes the step of;

slip-controlling a torque converter by inputting said controlling throttle-valve opening degree data to a shift valve.

4. A method for regulating an automatic step-wise transmission system of a vehicle including a vehicle engine, comprising the steps of:

sensing real throttle-valve opening degree sensor data of the vehicle engine;

determining whether the vehicle engine is under start-up conditions when said real throttle-valve opening degree sensor data is sensed;

calculating a difference between said real throttle-valve opening degree sensor data sensed under the start-up conditions and reference throttle-valve opening degree data previously stored so as to obtain a correction value for said real throttle-valve opening degree sensor data;

correcting said real throttle-valve opening degree data by adding said correction value to produce controlling throttle-valve opening degree data; and

controlling the automatic step-wise transmission system by inputting said controlling throttle-valve opening degree data so as to produce a gear-changing control signal and to perform a gear-changing operation of the vehicle engine, wherein said automatic vehicle transmission system regulating step includes the step of;

direct-controlling a torque converter by inputting said controlling throttle-valve opening degree data to a shift valve.

5. A method for regulating an automatic step-wise transmission system of a vehicle including a vehicle engine, comprising the steps of:

sensing first real throttle-valve opening degree sensor data of the vehicle engine;

determining whether the vehicle engine is in a start-up status when said first real throttle-valve opening degree data is sensed;

calculating a difference between said first real throttle-valve opening degree sensor data sensed under the start-up status and reference throttle-valve opening degree data previously stored so as to obtain a first correction value for said first real throttle-valve opening degree sensor data;

correcting said first real throttle-valve opening degree sensor data by adding said first correction value to produce first controlling throttle-valve opening degree data;

changing a shift valve after determining whether a gear-changing operation is required based upon said first controlling throttle-valve opening degree sensor data;

sensing second real throttle-valve opening degree sensor data of the vehicle engine;

determining whether the vehicle engine is in a start-up status when said second real throttle-valve opening degree sensor data is sensed;

calculating a second difference between said second real throttle-valve opening degree sensor data sensed under said start-up status and said reference throttle-valve opening degree data previously stored so as to obtain a second correction value for said second real throttle-valve opening degree sensor data;

correcting said second real throttle-valve opening degree sensor data by adding said second correction value to produce second controlling throttle-valve opening degree data; and

,

controlling the automatic step-wise transmission system by inputting to said shift valve said second controlling throttle-valve opening degree data so as to accomplish the gear-changing operation of the vehicle engine.