Driving force control apparatus and method for vehicle

• US 20070043496A1
• Filed: 08/16/2006
• Published: 02/22/2007
• Est. Priority Date: 08/22/2005
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ogawa, Hiroyuki
• Granted Patent: US 7,844,382 B2
• Time in Patent Office: Days
• US Class Current: 701/53
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 2050/0042 Transfer function lag; delays
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power

Abstract

A driving force control apparatus includes a driver model that is a functional block adjusting characteristics relevant to human senses, and a powertrain manager that is a functional block adjusting hardware characteristics of a vehicle. The driver model includes a target base driving force calculation unit (static characteristics) using a base driving force map for example for calculating a target driving force from an accelerator pedal position, an OWC disengagement-to-synchronism dead time calculation unit, and a target transient characteristics addition unit using transient characteristics represented by a transfer function including a dead time to calculate a final target driving force from the target driving force. The target transient characteristics addition unit sets the dead time in the transient characteristics represented by “second-order lag system+dead time” based on the time required for a one-way clutch to change to the synchronous state.

Claims

1. A driving force control apparatus for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control apparatus comprising:

a target driving force setting unit setting a target driving force based on operation by a driver;

a transient characteristics addition unit calculating a final target driving force by adding, to said target driving force as set, transient characteristics of said target driving force, based on an operating state of said one-way clutch; and

a control unit controlling said power source and said transmission based on said final target driving force as calculated.

2. The driving force control apparatus for the vehicle according to claim 1, wherein

said driving force control apparatus further comprises a calculation unit calculating, when said one-way clutch is in a non-driven state, a required time that is required for the non-driven state to change to a driven state, and

said transient characteristics addition unit calculates the final target driving force by adding transient characteristics of said target driving force, based on a parameter that is set based on said required time.

3. The driving force control apparatus for the vehicle according to claim 1, wherein

said transient characteristics are second-order lag characteristics including a dead time characteristic having a dead time as a parameter.

4. The driving force control apparatus for the vehicle according to claim 3, wherein

said driving force control apparatus further comprises a calculation unit calculating, when said one-way clutch is in a non-driven state, a required time that is required for the non-driven state to change to a driven state, and

said transient characteristics addition unit sets said dead time based on said required time and calculates the final target driving force by adding transient characteristics of said target driving force.

5. The driving force control apparatus for the vehicle according to claim 1, wherein

said control unit includes

a first torque calculation unit calculating a target torque of said power source when said one-way clutch is in a driven state,

a second torque calculation unit calculating a target torque of said power source when said one-way clutch is in a non-driven state, and

a selection unit selecting one of said first torque calculation unit and said second torque calculation unit based on a state of said one-way clutch.

6. The driving force control apparatus for the vehicle according to claim 5, wherein

said power source is an internal combustion engine, and

said control unit controls a throttle opening position of said internal combustion engine.

7. A driving force control apparatus for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control apparatus comprising:

a target driving force setting unit setting a target driving force based on operation by a driver; and

a control unit controlling said power source based on said target driving force as set,

said control unit including

a first torque calculation unit calculating a target torque of said power source when said one-way clutch is in a driven state,

a second torque calculation unit calculating a target torque of said power source when said one-way clutch is in a non-driven state, and

a selection unit selecting one of said first torque calculation unit and said second torque calculation unit based on a state of said one-way clutch.

8. The driving force control apparatus according to claim 7, wherein

said power source is an internal combustion engine, and

said control unit controls a throttle opening position of said internal combustion engine.

9. A driving force control apparatus for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control apparatus comprising:

target driving force setting means for setting a target driving force based on operation by a driver;

transient characteristics addition means for calculating a final target driving force by adding, to said target driving force as set, transient characteristics of said target driving force, based on an operating state of said one-way clutch; and

control means for controlling said power source and said transmission based on said final target driving force as calculated.

10. The driving force control apparatus for the vehicle according to claim 9, wherein

said driving force control apparatus further comprises calculation means for calculating, when said one-way clutch is in a non-driven state, a required time that is required for the non-driven state to change to a driven state, and

said transient characteristics addition means includes means for calculating the final target driving force by adding transient characteristics of said target driving force, based on a parameter that is set based on said required time.

11. The driving force control apparatus for the vehicle according to claim 9, wherein

said transient characteristics are second-order lag characteristics including a dead time characteristic having a dead time as a parameter.

12. The driving force control apparatus for the vehicle according to claim 11, wherein

said driving force control apparatus further comprises calculation means for calculating, when said one-way clutch is in a non-driven state, a required time that is required for the non-driven state to change to a driven state, and

said transient characteristics addition means includes means for setting said dead time based on said required time and calculating the final target driving force by adding transient characteristics of said target driving force.

13. The driving force control apparatus for the vehicle according to claim 9, wherein

said control means includes

first torque calculation means for calculating a target torque of said power source when said one-way clutch is in a driven state,

second torque calculation means for calculating a target torque of said power source when said one-way clutch is in a non-driven state, and

selection means for selecting one of said first torque calculation means and said second torque calculation means based on a state of said one-way clutch.

14. The driving force control apparatus for the vehicle according to claim 13, wherein

said power source is an internal combustion engine, and

said control means includes means for controlling a throttle opening position of said internal combustion engine.

15. A driving force control apparatus for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control apparatus comprising:

target driving force setting means for setting a target driving force based on operation by a driver; and

control means for controlling said power source based on said target driving force as set,

said control means including

first torque calculation means for calculating a target torque of said power source when said one-way clutch is in a driven state,

second torque calculation means for calculating a target torque of said power source when said one-way clutch is in a non-driven state, and

selection means for selecting one of said first torque calculation means and said second torque calculation means based on a state of said one-way clutch.

16. The driving force control apparatus according to claim 15, wherein

said power source is an internal combustion engine, and

said control means includes means for controlling a throttle opening position of said internal combustion engine.

17. A driving force control method for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control method comprising the steps of:

setting a target driving force based on operation by a driver;

calculating a final target driving force by adding, to said target driving force as set, transient characteristics of said target driving force, based on an operating state of said one-way clutch; and

controlling said power source and said transmission based on said final target driving force as calculated.

18. The driving force control method for the vehicle according to claim 17, wherein

said driving force control method further comprises the step of calculating, when said one-way clutch is in a non-driven state, a required time that is required for the non-driven state to change to a driven state, and

said step of calculating the final target driving force by adding, to said target driving force as set, transient characteristics of said target driving force, calculates the final target driving force by adding transient characteristics of said target driving force, based on a parameter that is set based on said required time.

19. A driving force control method for a vehicle having a power source and a transmission connected to said power source, with a one-way clutch inserted in a powertrain including said transmission, said driving force control method comprising the steps of:

setting a target driving force based on operation by a driver;

performing a first computation to calculate a target torque of said power source when said one-way clutch is in a driven state and performing a second computation to calculate a target torque of said power source when said one-way clutch is in a non-driven state, based on said target driving force as set; and

controlling said power source based on the target torque as calculated.