Drive shaft torque controlling apparatus for use in a vehicle having a power transmission mechanism and method therefor

• US 5,938,712 A
• Filed: 11/20/1996
• Issued: 08/17/1999
• Est. Priority Date: 03/26/1993
• Status: Expired due to Fees

• Current Assignee: HITACHI, LTD. AND HITACHI AUTOMOTIVE ENGINEERING CO., LTD.
• Original Assignee: HITACHI, LTD. AND HITACHI AUTOMOTIVE ENGINEERING CO., LTD.
• Inventors: Yamaguchi, Kazuhiko, Okada, Mitsuyoshi, Ozaki, Naoyuki, Sato, Kazuhiko, Minowa, Toshimichi, Ibamoto, Masahiko, Kuroiwa, Hiroshi
• Primary Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/751,439
• Time in Patent Office: 1,000 Days
• Field of Search: 564/424.08, 564/424.082, 564/424.086, 564/424.085, 564/424.095, 564/424.083, 564/423.098, 564/431.04, 564/426.043 , 564/431.053, 564/424.084, 477/129, 477/127, 477/107, 477/33, 477/102, 477/143, 477/109, 477/121, 477/131, 477/70, 477/154, 477/155, 477/62, 477/80, 477/160
• US Class Current: 701/54
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 2050/0045 using databus protocols
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: F16H 2059/385 Turbine speed
• CPC Class Codes: F16H 2059/467 of torque converter
• CPC Class Codes: F16H 2061/0078 Linear control, e.g. PID, state feedback or Kalman
• CPC Class Codes: F16H 2061/0096 using a parameter map
• CPC Class Codes: F16H 59/40 Output shaft speed
• CPC Class Codes: F16H 59/42 Input shaft speed
• CPC Class Codes: F16H 61/061 using electric control means
• CPC Class Codes: F16H 63/502 for smoothing gear shifts

Abstract

At a torque converter characteristic assuming unit, during non gear shift, gear ratio and an input shaft torque are assumed and also during gear shift, accessory torque is assumed. So as to correct the accessory torque a deviation between pump torque and engine torque is learned and this value is given to the accessory torque, thereby the input shaft torque can be executed and assumed. A drive shaft torque is obtained from a drive shaft torque calculating unit, a control period of the drive shaft torque is determined, a reference drive shaft torque is determined during torque control period from a reference drive shaft torque setting unit. A deviation between the reference drive shaft torque and the drive shaft torque is obtained from a torque deviation executing unit. An engine controlling unit varies the engine torque by controlling an ignition period so as to decrease substantially zero the deviation.

Claims

1. A drive shaft torque controlling apparatus for a vehicle comprising an engine, an automatic transmission with a torque converter, and a controlling apparatus with at least one microcomputer for controlling said engine and said automatic transmission, comprising

(a) a detector for detecting input data including engine rotational speed and engine load, and automatic transmission output shaft rotational speed and gear position;

(b) storing means for storing an engine torque characteristic;

(c) storing means for storing a torque converter characteristic;

(d) means for obtaining engine output shaft torque data with said input data and said engine torque characteristic;

(e) means for obtaining a torque converter input torque with said input data and said torque converter characteristic;

(f) means for obtaining a deviation between said engine output torque and said torque converter input torque as an accessory torque; and

(g) means for obtaining said torque converter input torque using said accessory torque and said engine output torque.

2. A drive shaft torque controlling method for a vehicle having an engine, an automatic transmission with a torque converter, and a controlling apparatus with at least one microcomputer for controlling said engine and said automatic transmission, comprising the steps during a non-gear shift of said automatic transmission, of:

(a) obtaining an engine output torque using an engine torque characteristic and input data selected from the group consisting of engine speed, injection pulse width, throttle opening degrees, and engine intake air amount;

(b) obtaining automatic transmission input shaft rotational speed using automatic transmission output shaft rotational speed and gear position;

(c) obtaining a speed ratio of said torque converter using engine rotational speed and said automatic transmission input shaft rotational speed;

(d) obtaining a torque converter input torque using said speed ratio and a torque converter characteristic; and

(e) storing a deviation between said engine output torque and said torque converter input torque as an accessory torque; and

, during a gear shift of said automatic transmission, further comprising the step of

(f) correcting said stored accessory torque to said engine output torque.

3. A drive shaft torque controlling method for a vehicle having an engine, an automatic transmission with a torque converter, and a controlling apparatus with at least one microcomputer for controlling said engine and said automatic transmission, comprising the steps, during a non-gear shift of said automatic transmission, of:

(a) obtaining an engine output torque using an engine torque characteristic and input data selected from the group consisting of engine speed, injection pulse width, throttle opening degree, and engine intake air amount;

(b) obtaining an automatic transmission input shaft rotational speed using an automatic transmission output shaft rotational speed and gear position;

(c) obtaining a rotational speed ratio of said torque converter using engine rotational speed and automatic transmission input shaft rotational speed;

(d) obtaining a torque converter input torque using said rotational speed ratio and a torque converter characteristic; and

(e) storing a deviation between said engine output torque and said torque converter input torque as an accessory torque; and

during a gear shift of said automatic transmission, further comprising the steps of;

(f) correcting said stored accessory torque to said engine output torque and for calculating said torque converter input torque;

(g) obtaining a speed ratio using said torque converter input torque and said torque converter characteristic; and

(h) obtaining input shaft rotational speed data using said rotational speed ratio and said engine rotational speed.

4. A drive shaft torque controlling method for a vehicle having an engine, an automatic transmission with a torque converter, and a controlling apparatus with at least one microcomputer for controlling said engine and said automatic transmission, comprising the steps, during a non-gear shift of said automatic transmission and a non-lock-up of said torque converter, of:

(a) obtaining an engine output torque using an engine torque characteristic and input data selected from the group consisting of engine speed, injection pulse width, throttle opening degree, and engine intake air amount;

(b) obtaining automatic transmission input shaft rotational speed using automatic transmission output shaft rotational speed and gear position;

(c) obtaining a torque converter speed ratio using engine rotational speed and said automatic transmission input shaft rotational speed;

(d) obtaining a torque converter input torque using said speed ratio and a torque converter characteristic; and

(e) storing a deviation between said engine output torque and said torque converter input torque as an accessory torque; and

,

when said automatic transmission is connected directly, further comprising the step of

(f) correcting said stored accessory torque to said engine output torque.

5. In a drive shaft torque controlling method according to claim 4, wherein

the drive shaft controlling method comprises steps of:

when an engine breaking operates and a velocity of the vehicle is transferred to a deceleration condition;

giving a settled predetermined value is advance to a value of said input shaft torque.