Automotive integrated control system

• US 20020038647A1
• Filed: 10/02/2001
• Published: 04/04/2002
• Est. Priority Date: 10/02/2000
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Fujii, Takehito, Miyamoto, Noboru, Kato, Yoshifumi, Tashiro, Tsutomu, Kataoka, Motoaki
• Granted Patent: US 6,704,641 B2
• Time in Patent Office: Days
• US Class Current: 123/350
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2050/0004 In digital systems, e.g. discrete-time systems involving sampling
• CPC Class Codes: B60W 2510/0619 Air-fuel ratio
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2555/20 Ambient conditions, e.g. wind or rain
• CPC Class Codes: B60W 2710/0605 Throttle position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• 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 13/0207 changing valve lift or valve lift and timing
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02P 5/1502 using one central computing unit
• CPC Class Codes: Y02T 10/40 : Engine management systems

Abstract

Automotive control system designed to control a plurality of controlled elements installed in the vehicle is provided. The control system includes control circuits and a manager circuit. The control circuits are designed to perform given control tasks using pre-defined controlled variables. The manager circuit is designed to determine a target value of a preselected output parameter of at least one of the controlled elements in the form of a second controlled variable different from one of the controlled variables employed in the control circuit for the one of the controlled elements. The control system also includes an adaptor designed to translate the second controlled variable indicative of the target value of the output parameter into a value of the corresponding controlled variable. This allows the control system to be constructed easily without redesigning typical controlled elements.

Claims

1. An integrated control system for a vehicle comprising:

a manager circuit providing a plurality of target values of given controlled variables;

a plurality of control circuits designed to perform given control tasks of controlling operations of a plurality of controlled elements installed in the vehicle for bringing the controlled variables into agreement with the target values provided by said manager circuit; and

a translating circuit translating the target value of at least one of the controlled variables into a target value of a second controlled variable which is predefined as being used in performing at least one of the control tasks in said control circuits to bring the one of the controlled variables into agreement with the target value.

2. An integrated control system as set forth in claim 1, further comprising condition comparing means for comparing a given controlled variable-related condition associated with the controlled element which is controlled in operation using the second controlled variable with a reference controlled variable-related condition to determine a difference therebetween and translation correcting means for correcting a translation scheme of said translating circuit so as to compensate for an error between the target value of the one of the controlled variables and an actual one arising from the difference between the controlled variable-related condition and the reference controlled variable-related condition.

3. An integrated control system as set forth in claim 1, further comprising condition comparing means for comparing a given controlled variable-related condition of the controlled element which is controlled in operation using the second controlled variable with a reference controlled variable-related condition to determine a difference therebetween and correcting means for correcting the target value of the one of the controlled variables so as to compensate for an error between the target value and an actual one arising from the difference between the controlled variable-related condition and the reference controlled variable-related condition.

4. An integrated control system as set forth in claim 1, wherein at least one of said control circuits produces a target value of a third controlled variable as a control request to another of said controlled circuits which is different from the controlled variable provided by said manager circuit to said another of said control circuits, and further comprising a controlled variable translating circuit designed to translate the target value of the third controlled variable into a target value of the controlled variable provided by said manager circuit to said another of said control circuits.

5. An integrated control system as set forth in claim 4, wherein said translating circuit translates the target value of the controlled variable provided by said manager circuit to said another of said control circuits plus the target value translated by said control variable translating circuit into a target value of the second controlled variable which is predefined as being used in performing the control task in said another of said control circuits.

6. An integrated control system as set forth in claim 1, wherein said control circuits are designed to control operations of controlled elements of a power trains of the vehicle including an engine, and said manager circuit determines the target values of the controlled variables so that a drive force of the vehicle reaches a target one.

7. An integrated control system as set forth in claim 6, wherein said translating circuit translates the target value of the controlled variable into the target value of the second controlled variable as a function of speed of the engine.

8. An integrated control system as set forth in claim 6, wherein one of said control circuits designed to control the engine is an engine control circuit, at least one of said control circuits except said engine control circuit provides a control request signal indicative of a target retard ignition angle to said engine control circuit, and further comprising a controlled variable translating circuit designed to translate the target retard ignition angle into a target value of the controlled variable provided by said manager circuit to said engine control circuit.

9. An integrated control system as set forth in claim 8, wherein said translating circuit adds the target value of the controlled variable provided by said manager circuit to said engine control circuit to the target value translated by said controlled variable translating circuit to provide an ultimate target value of the controlled variable to said engine control circuit.

10. An integrated control system as set forth in claim 6, wherein one of said control circuits designed to control the engine is an engine control circuit, said manager circuit provides a controlled parameter indicative of either of a target engine torque and a target engine output power as the target value of the controlled variables to said engine control circuit, said translating circuit translates the controlled parameter into a second controlled parameter indicative of a target position of a throttle valve of the engine, and said engine control circuit performs a throttle control task to actuate the throttle valve so that the target position of the throttle valve is reached.

11. An integrated control system as set forth in claim 10, wherein said translating circuit works to translate the controlled parameter into the second controlled parameter based on a response characteristic of the engine to a change in position of the throttle valve for compensating for a response lag between a change in engine torque and a change in position of the throttle valve.

12. An integrated control system as set forth in claim 10, wherein at least one of said control circuits except said engine control circuit provides a control request signal indicative of a target retard ignition angle to said engine control circuit, and further comprising a controlled variable translating circuit designed to translate the target retard ignition angle into a correction parameter which indicates an amount of engine torque or engine output power to be changed and is equivalent in kind to the controlled variable provided by said manager circuit to said engine control circuit, and wherein said translating circuit corrects the controlled parameter indicative of either of the target engine torque and the target engine output power using the correction parameter and uses the corrected controlled parameter to produce the second controlled parameter indicative of the target position of the throttle valve of the engine.

13. An integrated control system as set forth in claim 12, wherein said engine control circuit is also designed to perform an ignition timing control task of retarding ignition timing of the engine, and wherein said translating circuit produces the second controlled parameter indicative of the target position of the throttle valve in a range within which as much of either of the target engine torque and the target engine output power as possible is reached and also translates a lack of either of the target engine torque and the target engine output power which is not achieved by control of the throttle valve into a target retard ignition angle achieved by performing said ignition timing control task in said engine control circuit.

14. An integrated control system as set forth in claim 6, further comprising condition comparing means for comparing a given operating condition of the engine with a pre-defined reference operating condition of the engine to determine a difference therebetween and translation correcting means for correcting a translation scheme of said translating circuit so as to compensate for an error between the target value of the one of the controlled variables and an actual one arising from the difference between the given operating condition and the pre-defined reference operating condition.

15. An integrated control system as set forth in claim 6, further comprising condition comparing means for comparing a given operating condition of the engine with a pre-defined reference operating condition of the engine to determine a difference therebetween and correcting means for correcting the target value of the one of the controlled variables so as to compensate for an error between the target value and an actual one arising from the difference between the given operating condition and the pre-defined reference operating condition.

16. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual ignition timing of the engine and a pre-defined reference ignition timing of the engine.

17. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual ignition timing of the engine and a pre-defined reference ignition timing of the engine.

18. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual atmospheric pressure and a pre-defined reference atmospheric pressure.

19. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual atmospheric pressure and a pre-defined reference atmospheric pressure.

20. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual boost pressure of a turbocharger installed in the engine and a pre-defined reference boost pressure of the turbocharger.

21. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual boost pressure of a turbocharger installed in the engine and a pre-defined reference boost pressure of the turbocharger.

22. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual opening timing of intake and exhaust valves of the engine and a pre-defined reference opening timing of the intake and exhaust valves.

23. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual opening timing of intake and exhaust valves of the engine and a pre-defined reference opening timing of the intake and exhaust valves.

24. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual amount of lift of intake and exhaust valves of the engine and a pre-defined reference amount of lift of the intake and exhaust valves.

25. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual amount of lift of intake and exhaust valves of the engine and a pre-defined reference amount of lift of the intake and exhaust valves.

26. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual amount of exhaust gas recirculated through an exhaust gas recirculation system and a pre-defined reference amount of recirculated exhaust gas.

27. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual amount of exhaust gas recirculated through an exhaust gas recirculation system and a pre-defined reference amount of recirculated exhaust gas.

28. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an air-fuel ratio of a mixture supplied to the engine and a pre-defined reference air-fuel ratio of the engine.

29. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an air-fuel ratio of a mixture supplied to the engine and a pre-defined reference air-fuel ratio of the engine.

30. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between a load exerted on the engine produced by an auxiliary mechanism driven by the engine and a pre-defined reference load.

31. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between a load exerted on the engine produced by an auxiliary mechanism driven by the engine and a pre-defined reference load.

32. An integrated control system as set forth in claim 14, wherein the difference as determined by said condition comparing means is a difference between an actual output torque of the engine and a pre-defined reference output torque of the engine.

33. An integrated control system as set forth in claim 15, wherein the difference as determined by said condition comparing means is a difference between an actual output torque of the engine and a pre-defined reference output torque of the engine.

34. An integrated control system as set forth in claim 24, wherein the power train includes an automatic transmission with a torque converter, and the actual output torque is determined based on a speed of the engine and a speed of an output shaft of the torque converter.