Control apparatus and a control method for a vehicle

• US 6,543,422 B2
• Filed: 02/22/2002
• Issued: 04/08/2003
• Est. Priority Date: 12/28/1993
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Minowa, Toshimichi, Ishii, Junichi, Kuragaki, Satoshi
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US10/080,201
• Publication Number:
  US 20020078930A1
• Time in Patent Office: 410 Days
• Field of Search: 123/335, 123/361, 123/399, 123/396, 123/436, 123/478, 123/440, 123/486, 477/107, 477/110, 477/111, 180/167, 180/168, 180/169, 180/170, 180/178, 180/179, 180/69.4, 340/901, 340/903, 340/905, 340/435, 701/103, 701/104, 701/105, 701/110, 701/115, 701/117, 701/118, 701/119, 348/42, 348/47, 348/48, 348/50, 348/113, 348/114, 348/118, 348/119, 348/120, 307/9.1, 307/10.1
• US Class Current: 123/478
• CPC Class Codes: B60R 16/0236 for economical driving
• 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 2200/602 Pedal position
• CPC Class Codes: F02D 2200/702 Road conditions
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 2400/12 Engine control specially adapted for a transmission comprising a torque converter or for continuously variable transmissions
• CPC Class Codes: F02D 35/0015 using exhaust gas sensors F02D41/14 takes precedence
• 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 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/14 Introducing closed-loop corrections
• CPC Class Codes: F02D 41/1479 Using a comparator with variable reference
• CPC Class Codes: F02D 41/1486 with correction for particular operating conditions
• CPC Class Codes: F02D 41/2406 using essentially read only memories
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration

Abstract

A control device and a control method capable of eliminating a torque variation in changing an air/fuel ratio and establishing a compatibility of promotion in fuel economy with promotion in drivability is provided. The device includes an outer environment detector for detecting an outer environment in running a vehicle, a running environment determining device for predicting a current running environment in accordance with the outer environment, a data storage device for storing data for changing a driving characteristic, a selecting device for selecting the data, a control quantity calculator for calculating a control quantity based on the data, and a control actuator for controlling a control object. The engine output is efficiently utilized since the air/fuel ratio is changed in accordance with the change in the running environment, and the fuel cost reduction and the promotion of the drivability can be achieved since the selecting of the air/fuel ratio is performed in accordance with the running environment.

Claims

1. A control system for a vehicle which operates in an outer environment, comprising:

an outer environment detector that supplies information on the outer environment; and

a control unit that outputs a targeted engine torque based on the information on the outer environment from the outer environment detector whereby a targeted torque value obtained is a function of said outer environment information.

2. The control system according to claim 1, wherein the outer environment detector is a distance detecting system.

3. The control system according to claim 1, wherein the outer environment detector is a camera.

4. The control system according to claim 1, wherein the outer environment detector is an infrastructure information receiver.

5. The control system according to claim 1, wherein the outer environment detector is an outer vehicle environment recognizing sensor.

6. A control system for a vehicle which operates in an outer environment, comprising:

an outer environment detector that supplies information on the outer environment; and

an air/fuel ratio control unit that outputs a desired air/fuel ratio signal for the vehicle, the desired air/fuel ratio signal being determined based on the information on the outer environment from the outer environment detector whereby the air/fuel ratio value obtained is a function of said outer environment information.

7. The control system according to claim 6, further comprising:

a targeted driving shaft torque calculator that receives vehicle input signals and outputs a targeted driving shaft torque signal, the targeted driving shaft torque signal being determined as a function of the vehicle input signals.

8. The control system according to claim 6, wherein the outer environment detector is a distance detecting system.

9. The control system according to claim 6, wherein the outer environment detector is a camera.

10. The control system according to claim 6, wherein the outer environment detector is an infrastructure information receiver.

11. The control system according to claim 6, wherein the outer environment detector is an outer vehicle environment recognizing sensor.

12. The control system according to claim 6, further comprising:

a targeted engine torque calculator that receives the desired air/fuel ratio signal and outputs a targeted engine torque signal for the vehicle.

13. The control system according to claim 12, further comprising:

a targeted driving shaft torque calculator that receives vehicle input signals and outputs to the targeted engine torque calculator a targeted driving shaft torque signal, the targeted driving shaft torque signal being determined as a function of the vehicle input signals.

14. A control system for a vehicle which is operable in an outer environment, comprising:

an outer environment detector that supplies information on the outer environment;

a vehicle running environment determining system that receives the information on the outer environment and outputs a signal indicative of a predicted current running environment of the vehicle; and

an air/fuel ratio control unit that receives the predicted current running environment signal and outputs a desired air/fuel ratio signal for the vehicle, the desired air/fuel ratio signal being determined based on the predicted current running environment whereby an air/fuel ratio obtained is a function of said current running environment.

15. The control system according to claim 14, wherein the outer environment detector is a camera.

16. The control system according to claim 14, wherein the outer environment detector is an infrastructure information receiver.

17. The control system according to claim 14, wherein the outer environment detector is a distance detecting system.

18. The control system according to claim 14, wherein the outer environment detector is an outer environment recognizing sensor.

19. The control system according to claim 14, wherein control of a throttle valve opening is based on a targeted engine torque signal.

20. The control system according to claim 19, further comprising:

a throttle valve opening position calculator that receives the targeted engine torque signal and supplies a targeted throttle valve opening position signal to control the throttle valve opening for the vehicle, and

wherein the throttle valve opening position calculator additionally receives an engine rotational speed signal, the targeted throttle valve opening positioning signal being determined based on both the targeted engine torque signal and the engine rotational speed signal.

21. The control system according to claim 14, further comprising at least one actuator controlled in response to the desired air/fuel ratio signal.

22. The control system according to claim 21, further comprising:

a fuel quantity calculator that receives the desired air/fuel ratio signal and supplies a fuel injection signal, wherein said at least one actuator is a fuel injector that receives the fuel injection signal; and

wherein another actuator is an electronic throttle control valve that receives a targeted throttle valve opening position signal.

23. The control system according to claim 22, wherein the fuel injector is a direct fuel injector.

24. The control system according to claim 14, further comprising:

a targeted driving shaft torque calculator that receives vehicle input signals and outputs a targeted driving shaft torque signal, the targeted driving shaft torque signal being determined as a function of the vehicle input signals.

25. The control system according to claim 24, wherein the vehicle input signals comprise at least an accelerator opening position signal and a vehicle speed signal.

26. The control system according to claim 24, further comprising:

a storage device containing operational characteristic data for the vehicle, said operational characteristic data for the vehicle, including air/fuel ratio data, being selected as a function of the predicted current running environment signal;

wherein the operational characteristic data further includes torque converter characteristic data and engine characteristic data; and

wherein a targeted engine torque calculator further receives the operational characteristic data along with the targeted driving shaft torque signal, and determines a targeted engine torque signal based on said operational characteristic data and the targeted driving shaft torque signal.

27. The control system according to claim 14, further comprising:

a targeted engine torque calculator that receives the desired air/fuel ratio signal and outputs a targeted engine torque signal for the vehicle.

28. The control system according to claim 27, wherein the targeted engine torque signal is based on the desired air/fuel ratio signal and vehicle input signals comprising at least an accelerator opening position signal and a vehicle speed signal.

29. The control system according to claim 27, further comprising:

a storage device containing operational characteristic data for the vehicle, said operational characteristic data for the vehicle, including air/fuel ratio data, being selected as a function of the predicted current running environment signal;

wherein the operational characteristic data further includes torque converter characteristic data and engine characteristic data; and

wherein the targeted engine torque calculator further receives the operational characteristic data along with the targeted driving shaft torque signal, and determines the targeted engine torque signal based on said operational characteristic data and the targeted driving shaft torque signal.

30. The control system according to claim 27, wherein control of a throttle valve opening is based on the targeted engine torque signal.

31. The control system according to claim 30, further comprising:

a throttle valve opening position calculator that receives the targeted engine torque signal and supplies a targeted throttle valve opening position signal for the vehicle, the targeted throttle valve opening position signal being based on the targeted engine torque signal; and

wherein the throttle valve opening position calculator additionally receives an engine rotational speed signal, the targeted throttle valve opening positioning signal being determined based on both the targeted engine torque signal and the engine rotational speed signal.

32. The control system according to claim 27, further comprising:

a targeted driving shaft torque calculator that receives vehicle input signals and outputs to the targeted engine torque calculator a targeted driving shaft torque signal, the targeted driving shaft torque signal being determined as a function of the vehicle input signals.

33. The control system according to claim 32, further comprising:

a storage device containing operational characteristic data for the vehicle, said operational characteristic data for the vehicle, including air/fuel ratio data, being selected as a function of the predicted current running environment signal;

wherein the operational characteristic data further includes torque converter characteristic data and engine characteristic data; and

wherein the targeted engine torque calculator further receives the operational characteristic data along with the targeted driving shaft torque signal, and determines the targeted engine torque signal based on said operational characteristic data and the targeted driving shaft torque signal.

34. The control system according to claim 32, wherein control of a throttle valve opening is based on the targeted engine torque signal.

35. The control system according to claim 34, further comprising:

a throttle valve opening position calculator that receives the targeted engine torque signal and supplies a targeted throttle valve opening position signal to control the throttle valve opening for the vehicle; and

wherein the throttle valve opening position calculator additionally receives an engine rotational speed signal, the targeted throttle valve opening positioning signal being determined based on both the targeted engine torque signal and the engine rotational speed signal.

36. The control system according to claim 32, wherein the vehicle input signals comprise at least an accelerator opening position signal and a vehicle speed signal.

37. The control system according to claim 36, wherein the outer environment detector is a camera.

38. The control system according to claim 36, wherein the outer environment detector is an infrastructure information receiver.

39. The control system according to claim 36, wherein the outer environment detector is a distance detecting system.

40. The control system according to claim 36, wherein the outer environment detector is an outer environment recognizing sensor.