Control device and control method of engine

• US 9,822,725 B2
• Filed: 12/17/2013
• Issued: 11/21/2017
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hamamoto, Yoshiaki, Ando, Daigo, Yasutomi, Shuichi, Hamada, Kengo
• Primary Examiner(s): Kwon, John
• Assistant Examiner(s): Hoang, Johnny H
• Application Number:
  US14/429,013
• Publication Number:
  US 20150247471A1
• Time in Patent Office: 1,435 Days
• Field of Search: 701102, 701103, 701106, 701114, 701115, 12333923, 12333924, 123674, 123681, 123684
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/16 for idling
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02D 41/2464 Characteristics of actuators
• CPC Class Codes: F02D 41/2493 Resetting of data to a predefined set of values
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A control device of an engine includes an adjustment mechanism and a controller. The adjustment mechanism is configured to adjust an intake air amount. The controller is configured to save a first learning value in a volatile storage medium, the first learning value being obtained by learning an operation amount of the adjustment mechanism when the engine is idle. The controller is configured to control the adjustment mechanism according to the first learning value. The controller is configured to save a second learning value in a non-volatile storage medium, the second learning value being equal to the first learning value. The controller is configured to correct the first learning value using the second learning value after the first learning value is cleared.

Claims

1. A control device for an engine, the control device comprising:

an adjustment mechanism configured to adjust an intake air amount; and

an ECU configured to

(a) save a first learning value in a volatile storage medium, the first learning value being obtained by learning an operation amount of the adjustment mechanism when the engine is idle,

(b) control the adjustment mechanism according to the first learning value,

(c) save a second learning value in a non-volatile storage medium, the second learning value being equal to the first learning value, and

(d) correct the first learning value using the second learning value after the first learning value is reset to an initial value,

(e) wherein the ECU is configured to correct the first learning value using the second learning value after the first learning value is reset to the initial value and when;

the operation amount of the adjustment mechanism is an operation amount corresponding to an initial value of the first learning value, and

an output torque of the engine is smaller than a predetermined value, and

wherein when a power supply of the ECU is stopped and the first learning value saved in the volatile storage medium is reset to the initial value, the ECU is configured to restore from the non-volatile memory, the second learning value being equal to the first learning value before being reset to the initial value.

2. The control device according to claim 1 wherein

the ECU is configured to stop updating of the second learning value after the first learning value is reset to the initial value.

3. The control device according to claim 1 wherein

the ECU is configured to correct the first learning value using the second learning value after the first learning value is reset to the initial value when:

the operation amount of the adjustment mechanism is an operation amount corresponding to an initial value of the first learning value; and

the engine fails to start.

4. The control device according to claim 1 wherein

the ECU is configured to correct the first learning value by adding a difference between the second learning value and the first learning value to the first learning value.

5. A control method for an engine, the engine including an intake air amount adjustment mechanism, the engine being configured to be controlled using an ECU, the ECU including a volatile storage medium and a non-volatile storage medium, the control method comprising:

(a) saving, by the ECU, a first learning value in the volatile storage medium, the first learning value being obtained by learning an operation amount of the adjustment mechanism when the engine is idle;

(b) controlling, by the ECU, the adjustment mechanism according to the first learning value;

(c) saving, by the ECU, a second learning value in the non-volatile storage medium, the second learning value being equal to the first learning value;

(d) correcting, by the ECU, the first learning value using the second learning value after the first learning value is reset to an initial value,

wherein correcting the first learning value using the second learning value after the first learning value is reset to the initial value includes correcting the first learning value using the second learning value after the first learning value is reset to the initial value and when;

the operation amount of the adjustment mechanism is an operation amount corresponding to an initial value of the first learning value, and

an output torque of the engine is smaller than a predetermined value; and

(e) restoring, when a power supply of the ECU is stopped and the first learning value saved in the volatile storage medium is reset to the initial value, the second learning value from the non-volatile memory, the second learning value being equal to the first learning value before being reset to the initial value.

6. The control method according to claim 5 wherein

updating of the second learning value is stopped, by the ECU, after the first learning value is reset to the initial value.

7. The control method according to claim 5 wherein

the first learning value is corrected, by the ECU, using the second learning value after the first learning value is reset to the initial value and when:

the operation amount of the adjustment mechanism is an operation amount corresponding to the initial value of the first learning value; and

the engine fails to start.

8. The control method according to claim 5 wherein

the first learning value is corrected by adding a difference between the second learning value and the first learning value to the first learning value by the ECU.