Control apparatus and a control method for a vehicle

• US 5,638,790 A
• Filed: 08/09/1996
• Issued: 06/17/1997
• Est. Priority Date: 12/28/1993
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Minowa, Toshimichi, Ishii, Junichi, Kuragaki, Satoshi
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US08/695,345
• Time in Patent Office: 312 Days
• Field of Search: 123/416, 123/417, 123/419, 123/436, 123/478, 123/480, 123/486, 123/399, 477/107, 477/111, 180/170, 180/178, 180/179, 180/69.4
• US Class Current: 123/436
• 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 method for controlling a control actuator in a vehicle operating in a running environment, comprising the steps of:

detecting a condition of the vehicle;

selecting at least one of a plurality of data in accordance with the condition of the vehicle;

selecting the plurality of data characterized by performing a control for changing an air/fuel ratio in accordance with a torque change of the vehicle which is not caused by an air/fuel ratio change.

2. A control method for controlling a control actuator in a vehicle operating in a running environment, comprising the steps of:

detecting a condition of the vehicle;

selecting at least one of a plurality of data in accordance with the condition of the vehicle;

selecting the plurality of data characterized by performing a control for changing an air/fuel ratio in synchronism with a change in an operating state condition of the vehicle.

3. The control method according to claim 2, wherein said change in an operating state condition is at least one of a changing from a partial load state condition to an idling state condition, a speed changing condition, and a gear shift lever changing condition.

4. A control apparatus for controlling at least one control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment detector for detecting the outer environment of the vehicle;

an outer environmental signal generator for generating an outer environmental signal indicating said outer environment of the vehicle;

a calculating means for calculating a target driving torque in accordance with a vehicle speed and an acceleration pedal stroke of the vehicle; and

a control unit for deciding control data controlling said actuator in accordance with either said target driving torque or said outer environment signal.

5. The control apparatus according to claim 4, wherein said control data includes at least one of an air quantity, a fuel quantity, an ignition timing and a transmission speed change ratio of the vehicle.

6. A control apparatus for controlling at least one control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment detector for detecting the outer environment of the vehicle;

an outer environmental signal generator for generating an outer environmental signal indicating said outer environment of the vehicle;

a calculating means for calculating a target driving torque in accordance with a vehicle speed and an acceleration pedal stroke of the vehicle; and

a control unit for selecting either said target driving torque or said outer environmental signal at a timing of a generating of said outer environmental signal, and deciding control data for controlling said actuator in accordance with either said target driving torque or said outer environment signal.

7. The control apparatus according to claim 6, wherein said control data includes at least one of an air quantity, a fuel quantity, an ignition timing and a transmission speed change ratio of the vehicle.

8. A control apparatus for controlling at least one control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment detector for detecting the outer environment of the vehicle;

an outer environmental signal generator for generating an outer environmental signal indicating said outer environment of the vehicle;

a calculating means for calculating a target driving torque in accordance with a vehicle speed and an acceleration pedal stroke of the vehicle; and

a control unit for correcting said target driving torque by said outer environmental signal at a timing of a generating of said outer environmental signal, and deciding control data for controlling said actuator in accordance with said corrected target driving torque.

9. The control apparatus according to claim 8, wherein said control data includes at least one of an air quantity, a fuel quantity, an ignition timing and a transmission change ratio of the vehicle.

10. A control apparatus for controlling a control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment receiver for receiving the outer environment of the vehicle and outputting a signal indicating the outer environment;

a memory storing at least one data which are air/fuel ratio values used for controlling an air/fuel ratio of an engine of the vehicle; and

a controller for changing from one of said air/fuel ratio values to another in accordance with said signal in order to control said control actuator.

11. The control apparatus according to claim 10, wherein said controller controls a transmission speed change actuator changing a transmission speed ratio of the vehicle.

12. A control apparatus for controlling a control actuator in a vehicle operating in a running environment, comprising:

first detecting means for detecting a vehicle speed;

second detecting means for detecting a forward intervehicle distance;

third detecting means for detecting a rearward intervehicle distance;

calculating means for calculating a timewise change data of said vehicle speed and at least one of said forward intervehicle distance and said rearward intervehicle distance; and

means for controlling said control actuator in accordance with said timewise change data.

13. The control apparatus according to claim 12, wherein said calculating means calculates an acceleration of the vehicle and a mean vehicle speed of the vehicle to determine the running environment.

14. The control apparatus according to claim 12, wherein the control actuator is a fuel injection valve.

15. A control apparatus for controlling a control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment receiver for receiving the outer environment of the vehicle and outputting a signal indicating the outer environment;

a memory storing at least one data which is used to operate an engine of the vehicle; and

a data selecting means for selecting one of said at least one data in accordance with said signal to affect a change in the control actuator.

16. The control apparatus according to claim 15, wherein said memory stores a plurality of data which includes air/fuel ratio values used for controlling an air/fuel ratio of the engine.

17. The control apparatus according to claim 16, further comprising:

a controller for controlling a transmission speed change actuator changing a transmission speed ratio of the vehicle.

18. The control apparatus according to claim 15, wherein said memory stores at least one program for calculating at least one air/fuel ratio value used for controlling an air/fuel ratio of the engine.

19. The control apparatus according to claim 18, further comprising:

a controller for controlling a transmission speed change actuator changing a transmission speed ratio of the vehicle.

20. A control device for a power train of a vehicle which controls an air flow quantity and a fuel quantity supplied into an engine of said vehicle, an ignition timing of said engine, and a transmission speed change reduction ratio corresponding to a value of a targeted driving torque calculated using an acceleration opening position α

and a vehicle speed v_sp, comprising;

means for determining a current running environment of the vehicle;

means for outputting control data in response to said running environment; and

a control actuator which controls at least one of said air flow quantity, fuel quantity, ignition timing, and transmission speed change reduction ratio in accordance with said control data.

21. The control device according to claim 20, further comprising at least one outer environment receiver for receiving the outer environment of the vehicle;

and

wherein said means for determining the current running environment operates in accordance with the outer environment from the at least one outer environment receiver.

22. The control device according to claim 20, wherein said means for outputting is at least one of a fuel quantity calculator and a throttle opening position calculator.

23. The control device according to claim 22, further comprising a targeted engine torque calculator which calculates a targeted engine torque using said target driving torque, said targeted engine torque being output to said throttle opening position calculator.

24. A control apparatus for controlling a control actuator in a vehicle operating in a running environment, comprising:

at least one outer environment receiver for receiving the outer environment of the vehicle;

a running environment determining means for determining a current running environment of the vehicle in accordance with the outer environment from the outer environment receiver;

a memory storing at least one data which is used in a non-steady state condition of the vehicle;

a data selecting means for selecting one of said at least one data in accordance with a change in the running environment to affect a change in the control actuator.

25. A control apparatus according to claim 24, further comprising:

an air/fuel ratio controlling means for controlling the air/fuel ratio in accordance with a torque change of the vehicle which is not caused by an air/fuel ratio change.

26. The control apparatus according to claim 24, wherein said memory stores a plurality of data which further includes steady-state conditions of the vehicle.

27. The control apparatus according to claim 26, wherein said data selecting means operates to first select a steady state condition in said memory for a first running environment, and to next select a non-steady state condition in said memory in response to said change in the running environment.

28. A control apparatus according to claim 24, further comprising:

an air/fuel ratio controlling means for controlling an air/fuel ratio in accordance with a change in an operating state condition of the vehicle.

29. The control apparatus according to claim 28, wherein said change in the operating state condition is at least one of a changing from a partial load state condition to an idling state condition, a speed changing condition, and a gear shift lever shifting condition.

30. The control apparatus according to claim 24, wherein said memory stores a plurality of data which includes corrected air/fuel ratio values used for controlling an air/fuel ratio of an engine of the vehicle.

31. The control apparatus according to claim 30, wherein the corrected air/fuel ratio values are correction values determined by an engine rotational speed and an engine load, said correction values being classified into air/fuel ratios for a low engine rotational speed condition and a no load condition, and into air/fuel ratios for the engine load changing between a partial load and a high load and a high load.

32. The control apparatus according to claim 30, further comprising:

an air flow quantity controlling means for operating to restrain a torque variation which occurs during the selecting of the corrected air/fuel ratio values.

33. The control apparatus according to claim 32, wherein said air flow quantity controlling means is a throttle opening position calculator.

34. The control apparatus according to claim 24, wherein the running environment is at least one of an external environment to the vehicle such as a road incline, a traffic jam, an expressway and a city road.

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

a correcting means for operating to restrain a torque variation when said one data is selected in accordance with the change in the running environment.

36. The control apparatus according to claim 34, wherein the outer environment receiver is at least one of an infrastructure information detector, an outer vehicle environment recognizing sensor, and a running state detector.

37. The control apparatus according to claim 34, wherein the data selecting means operates on a priority basis and comprises means for prioritizing a drivability of the vehicle over fuel economy when a plurality of the running environments overlap.

38. The control apparatus according to claim 37, wherein the priority determining means prioritizes an air/fuel ratio for an inclined road over an air/fuel ratio for a traffic jam.

39. A control method for controlling a control actuator in a vehicle operating in a running environment, comprising the steps of:

receiving at least one outer environment of the vehicle;

determining a current running environment of the vehicle in accordance with the received outer environment;

detecting a change in the running environment to affect a change in the control actuator;

selecting, from a plurality of data stored in a memory of the vehicle, at least one data which is used in a non-steady state condition of the vehicle in accordance with said change in the running environment; and

calculating a control amount for controlling said control actuator;

controlling said control actuator in accordance with said control amount.

40. The control method according to claim 39, wherein said plurality of data further includes steady state conditions of the vehicle.

41. The control method according to claim 40, wherein said selecting step further comprises the step of selecting one non-steady state condition in said memory in response to said change in the running environment after selecting one steady state condition in said memory for a first running environment.

42. The control method according to claim 41, wherein said plurality of data are corrected air/fuel ratio values for controlling an air/fuel ratio of an engine of the vehicle.

43. The control method according to claim 42, further comprising the step of:

determining said corrected air/fuel ratio values by an engine rotational speed and an engine load which are classified into air/fuel ratios for a low engine rotational speed and a no load, and air/fuel ratios for the engine load changing between a partial load and a high load.

44. The control method according to claim 42, further comprising the step of:

operating to restrain a torque variation which occurs during the selecting of the corrected air/fuel ratio values.

45. The control method according to claim 44, wherein said operating step is carried out by a throttle opening position controller.

46. The control method according to claim 41, wherein said running environment is at least one of an external environment to the vehicle such as a road incline, a traffic jam, an expressway, and a city road.

47. The control method according to claim 46, further comprising the step of:

operating to restrain a torque variation when said one of the plurality of data is selected in accordance with the change in the running environment.

48. The control method according to claim 46, wherein said step for detecting the running environment is carried out by an outer environment detector which receives said at least one outer environment.

49. The control method according to claim 48, wherein said outer environment detector is at least one of an infrastructure information detector, an outer vehicle environment recognizing sensor, and a running state detector.

50. The control method according to claim 48, wherein said selecting step for at least one of a plurality of data stored in said memory includes the step of prioritizing a drivability of the vehicle over a fuel economy of the vehicle when a plurality of the running environments overlap.

51. The control method according to claim 50, wherein said prioritizing step prioritizes an air/fuel ratio for an inclined road over an air/fuel ratio for a traffic jam.