Engine control apparatus

• US 8,352,150 B2
• Filed: 08/05/2008
• Issued: 01/08/2013
• Est. Priority Date: 04/07/2006
• Status: Active Grant

• Current Assignee: Subaru Corp.
• Original Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Inventors: Hijikata, Kenji
• Primary Examiner(s): Cronin, Stephen K
• Assistant Examiner(s): VILAKAZI, SIZO BINDA
• Application Number:
  US12/222,217
• Publication Number:
  US 20080300768A1
• Time in Patent Office: 1,617 Days
• Field of Search: 701/102, 701/103, 701/104, 701/110, 701/115, 123/406.23, 180/65.21, 180/65.31
• US Class Current: 701/102
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2200/501 Vehicle speed
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/2422 Selective use of one or more tables

Abstract

A storage unit provided in an engine control device stores three kinds of mode maps having different engine output characteristics. One of the mode maps is selected in accordance with the driving conditions, and a target torque is set by referring to the selected mode map using an engine speed and an accelerator opening-degree as parameters. A throttle opening-degree signal corresponding to the target torque is output to a throttle actuator, and an operation of opening or closing the throttle valve is performed in response to the throttle opening-degree signal.

Claims

1. An engine control apparatus, comprising:

driving-state detection means for detecting a driving state;

storage means for storing mode maps for respective engine control modes, the engine control modes including at least a power mode comprising engine output characteristics that prioritize power and a save mode comprising engine output characteristics with which power is suppressed, each mode map comprising lattice axes of an accelerator opening-degree and the driving state and setting an engine output command value for a corresponding engine control mode of the engine control modes;

selecting means for selecting one of the engine control modes; and

engine-output-command-value determining means for determining the engine output command value by referring to the mode map corresponding to the engine control mode selected by the selecting means,

wherein the selecting means automatically selects one of the engine control modes on a basis of the driving state detected by the driving-state detection means, and

wherein the driving state comprises an accelerator opening-degree change rate.

2. The engine control apparatus according to claim 1, wherein the selecting means automatically selects one of the engine control modes on a basis of a vehicle speed and a weighted average of sums of parameters corresponding to a plurality of events based on the driving state detected by the driving-state detection means.

9. The engine control apparatus according to claim 1, wherein the accelerator opening-degree comprises an amount of actuation of an accelerator pedal.

10. The engine control apparatus according to claim 1, wherein the engine output command value comprises a target torque value.

11. The engine control apparatus according to claim 1, wherein the engine output command value comprises a target throttle opening-degree value.

12. The engine control apparatus according to claim 1, wherein the engine output command value determining means adjusts the engine output command value if the accelerator opening-degree and a vehicle speed satisfy a predetermined condition, wherein the engine output command value (CV) is adjusted by a target command value of the selected engine control mode (TCSM) modified by a ratio (R) and a target command value of the non-selected engine control mode (TCNSM) which satisfies the equation:

CV=TCSM×

R+TCNSM×

(1−

R).

13. The engine control apparatus according to claim 1, wherein the driving state comprises a vehicle speed and a front or rear vehicle acceleration.

14. The engine control apparatus according to claim 1, wherein the driving state comprises at least one of a coefficient of friction of a road, and an outside temperature.

15. The engine control apparatus according to claim 2, wherein the plurality of events comprises driving conditions and a driving style of a driver.

16. The engine control apparatus according to claim 2, wherein the weighted average of the sums of parameters is calculated from when an ignition switch is turned on to when the ignition switch is turned off.

17. The engine control apparatus according to claim 2, wherein the weighted average of the sums of parameters is reset when a predetermined event occurs.

18. The engine control apparatus according to claim 2, wherein the plurality of events comprises at least one of a degree of ascent of a road, a degree of descent of the road, a degree of usage of high engine speeds, a degree of winding of the road, a degree of acceleration, and a degree of deceleration.

3. An engine control apparatus, comprising:

driving-state detection means for detecting a driving state;

storage means for storing mode maps for respective engine control modes, the engine control modes including at least a normal mode comprising engine output characteristics suitable for normal driving and a power mode comprising engine output characteristics that prioritize power, each mode map comprising lattice axes of an accelerator opening-degree and the driving state and setting an engine output command value for a corresponding engine control mode of the engine control modes;

selecting means for selecting one of the engine control modes; and

engine-output-command-value determining means for determining the engine output command value by referring to the mode map corresponding to the engine control mode selected by the selecting means,

wherein the selecting means automatically selects one of the engine control modes on a basis of the driving state detected by the driving-state detection means, and

wherein the driving state comprises an accelerator opening-degree change rate.

4. The engine control apparatus according to claim 3, wherein the selecting means automatically selects one of the engine control modes on a basis of a vehicle speed and a weighted average of sums of parameters corresponding to a plurality of events based on the driving state detected by the driving-state detection means.

5. An engine control apparatus, comprising:

driving-state detection means for detecting a driving state;

storage means for storing mode maps for respective engine control modes, the engine control modes including at least a normal mode comprising engine output characteristics suitable for normal driving and a save mode comprising engine output characteristics with which power is suppressed, each mode map comprising lattice axes of an accelerator opening-degree and the driving state and setting an engine output command value for a corresponding engine control mode of the engine control modes;

selecting means for selecting one of the engine control modes; and

engine-output-command-value determining means for determining the engine output command value by referring to the mode map corresponding to the engine control mode selected by the selecting means,

wherein the selecting means automatically selects one of the engine control modes on a basis of the driving state detected by the driving-state detection means, and

wherein the driving state comprises an accelerator opening-degree change rate.

6. The engine control apparatus according to claim 5, wherein the selecting means automatically selects one of the engine control modes on a basis of a vehicle speed and a weighted average of sums of parameters corresponding to a plurality of events based on the driving state detected by the driving-state detection means.

7. An engine control apparatus, comprising:

driving-state detection means for detecting a driving state;

storage means for storing mode maps for respective engine control modes, the engine control modes including at least a normal mode comprising engine output characteristics suitable for normal driving, a save mode comprising engine output characteristics with which power is suppressed, and a power mode comprising engine output characteristics that prioritize power, each mode map comprising lattice axes of an accelerator opening-degree and the driving state and setting an engine output command value for a corresponding engine control mode of the engine control modes;

selecting means for selecting one of the engine control modes; and

engine-output-command-value determining means for determining the engine output command value by referring to the mode map corresponding to the engine control mode selected by the selecting means,

wherein the selecting means automatically selects one of the engine control modes on a basis of the driving state detected by the driving-state detection means, and

wherein the driving state comprises an accelerator opening-degree change rate.

8. The engine control apparatus according to claim 7, wherein the selecting means automatically selects one of the engine control modes on a basis of a vehicle speed and a weighted average of sums of parameters corresponding to a plurality of events based on the driving state detected by the driving-state detection means.