Adaptive system for controlling an engine according to conditions categorized by driver's intent

• US 4,899,280 A
• Filed: 04/08/1988
• Issued: 02/06/1990
• Est. Priority Date: 04/08/1987
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Funabashi, Motohisa, Sekozawa, Teruji, Onari, Mikihiko
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Trans, V. N.
• Application Number:
  US07/179,542
• Time in Patent Office: 669 Days
• Field of Search: 364/431.05, 364/431.07, 364/431.03, 364/431.04, 364/424, 123/339, 123/419, 123/422, 123/423, 123/480, 123/492, 123/493
• US Class Current: 701/103
• CPC Class Codes: F02D 41/04 Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/2422 Selective use of one or more tables
• CPC Class Codes: F02D 41/2441 characterised by the learning conditions
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02D 41/26 using computer, e.g. microprocessor

Abstract

An adaptive control system for categorized engine conditions is disclosed in which the engine conditions to be controlled are discriminated and classified in accordance with the driver'"'"'s intent and the vehicle operating conditions. It is decided that a given engine control condition is continued or the transition is under way between different control conditions as a history judgement, and a vehicle operation parameter is determined in accordance with the determined history. At the same time, in accordance with the control condition decided and classified, an operating signal is applied to the engine with an operating parameter thus determined and the result of engine control response is observed to update the adaptive parameter.

Claims

1. An adaptive control system for controlling an engine of a vehicle in a plurality of categorized conditions, comprising:

a plurality of driving operation sensors for detecting a driving operation of the vehicle taken according to a driver'"'"'s intent;

a plurality of operating condition sensors including a linear oxygen sensor for detecting operating conditions of the vehicle and the engine;

a plurality of actuators for controlling means for operating the engine;

condition discrimination means for determining one of engine control conditions from the detected results of the driving operation sensors and the operating condition sensors;

a history file for storing past engine control conditions;

history judgment means for judging whether the engine control condition at present is in a continuation of same engine control condition or in a transition process between different engine control conditions by comparing a past engine control condition retrieved from the history file with the engine control condition determined by the condition discrimination means;

control parameter determining means for determining engine control parameters from the result of judgment of the history judgment means and from an adaptive parameter retrieved from the history file updating means by use of a weighting process corresponding to a degree of transition between control conditions when the history judgment means judges that the engine is in said transition process between different ones of said plurality of engine control conditions, wherein the degree of transition between said different ones of said plurality of engine control conditions is determined from the ratio between a predetermined number of engine detonations needed for a smooth transition between said different ones of said plurality of engine control conditions and a number of engine detonations that has occurred from a first detonation at the start of said transition process;

control means having a plurality of control modes corresponding to said control conditions for applying an operating signal to each of the plurality of actuators on the basis of the control parameters determined by the control parameter determining means in each control mode in accordance with the engine control condition discriminated by the condition discrimination means; and

adaptive parameter updating means for receiving a control response parameter from the output of the operating condition sensors and for calculating an updated value of the adaptive parameter and for storing the updated value of said adaptive parameter in the history file.

2. An adaptive control system for categorized conditions of an engine according to claim 1, wherein said plurality of engine control conditions include an air-fuel ratio control condition, acceleration control condition, deceleration control condition and idle speed control condition, and the control modes include an air-fuel ratio control mode, acceleration control mode, deceleration control mode and an idle speed control mode.

3. An adaptive control system according to claim 1, wherein the control parameter determining means determines a fuel-air mixing ratio compensation factor as said control parameter.

4. An adaptive control system according to claim 1, wherein said control means includes means for calculating an amount of fuel injection and an ignition timing for each control mode of the control means.

5. An adaptive control system according to claim 1, wherein said linear oxygen sensor is used for measuring the amount of oxygen in the engine exhaust gas as said control response parameters, and said adaptive parameter updating means calculates an updated value of a mixing ratio adaption coefficient as said adaptive parameter and stores the updated value in the history file.

6. An adaptive control system according to claim 1 wherein said driving operation sensors include an acceleration pedal angle sensor, a brake pedal angle sensor and a torque interruption sensor.

7. An adaptive control system according to claim 1, wherein said operating condition sensors include a vehicle speed sensor, an engine speed sensor and an air mass flow rate sensor.

8. The adaptive control system according to claim 1, wherein said control parameter determining means determines a fuel-air mixing ratio compensation factor as said control parameter and said adaptive parameter updating means receives the output of said linear oxygen sensor as said control response parameter.

9. An adaptive system controlling an engine of a vehicle operating in a plurality of categorized conditions, comprising:

a plurality of driving operation sensors for detecting a driving operation based on a driver'"'"'s actions carried out in driving the vehicle;

a plurality of operating condition sensors including a linear oxygen sensor for detecting operating conditions of the vehicle and engine;

a plurality of actuators for controlling means for operating the engine;

condition discrimination means for predicting and discriminating an engine control condition of said categorized engine control conditions from the output of the said driving operation sensors and said operating condition sensors;

a history file for storing past engine control conditions;

history judgment means for judging whether the engine is in one of said categorized engine control conditions or in a transition state between different categorized engine control conditions;

control parameter determining means for determining an engine control parameter during transition between first and second engine control conditions including means for calculating said control parameter from first and second target control parameters and corresponding adaptive parameter by a weighting process corresponding to a degree of transition between said first and second engine control conditions wherein said calculating means calculates said control parameter by said weighting process on the basis of said first target control parameter and said corresponding adaptive parameter being received from storage in the history file for said first engine control condition and on the basis of said second target control parameter and said corresponding adaptive parameter for said second engine control condition, and further wherein the degree of transition between said first and second engine control conditions is determined by a ratio between a predetermined number of engine detonations needed for a smooth transition from said first engine control condition to said second engine control condition and a number of engine detonations that has occured from a first detonation at the start of said transition;

control means having a plurality of control modes corresponding to said control conditions for applying an operating signal to each of the plurality of actuators on the basis of said control parameter for each of said control modes; and

adaptive parameter updating means for receiving a control response parameter from the output of said operating condition sensors and for calculating an updated value of an adaptive parameter for each of said engine control conditions, and storing each of said updated value in the history file as said corresponding adaptive parameters for each of said engine control conditions.

10. The adaptive control system according to claim 9, wherein said control parameter determining means determines a fuel-air mixing ratio compensation factor as said control parameter by a weighted value of the sum of first and second produces of said target mixing ratio and said mixing ratio adaptation coefficient for each of said first and second engine control conditions respectively, wherein each said produce is modified by said ratio such that the value of said first product contributes more to said weighted value at the start of said transition than at the end of said transition;

and

wherein the value of said second product contributes more to said weighted value than said first product at the end of said transition whereby said mixing ratio compensation factor changes according to the degree of transition between said first and second engine control conditions.

11. An adaptive control system according to claim 10, further comprising:

said engine having means for controlling the injection of fuel into cylinders of said engine and means for controlling the timing of said engine; and

said control means receives said mixing ratio compensation factor and controls said fuel injection control means and said ignition timing control means in accordance with said mixing ratio compensation factor.