Parking control system for vehicle

Abstract

In a vehicle parking control system, to apply sufficient braking force quickly and reliably to a parking brake when a shift range of an automatic transmission changes to a Park range, thereby reliably preventing an operator from forgetting to engage the parking brake.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[FIG. 1]

FIG. 1 is a schematic diagram that shows an embodiment of a vehicle parking control system according to the present invention.

[FIG. 2]

FIG. 2 is a schematic diagram that shows the structure of an automatic transmission shown in FIG. 1.

[FIG. 3]

FIG. 3 is an oblique view that shows a parking mechanism shown in FIG. 2.

[FIG. 4]

FIG. 4 is a schematic diagram that shows the structure of an automatic transmission ECU shown in FIG. 1.

[FIG. 5]

FIG. 5 is a drawing that explains range position signals.

[FIG. 6]

FIG. 6 is a flowchart of an initialization processing routine that is executed by an engine ECU shown in FIG. 1.

[FIG. 7]

FIG. 7 is a flowchart of an initialization processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 8]

FIG. 8 is a flowchart of an actual range position change control routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 9]

FIG. 9 is a flowchart of a parking brake engagement processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 10]

FIG. 10 is a flowchart of a parking brake release processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 1]

FIG. 11 is a flowchart of a termination processing routine that is executed by the engine ECU shown in FIG. 1.

[FIG. 12]

FIG. 12 is a flowchart of a termination processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 13]

FIG. 13 is a time chart that shows an engagement operation of the vehicle parking control system.

[FIG. 14]

FIG. 14 is a time chart that shows an engagement release operation of the vehicle parking control system.

[FIG. 15]

FIG. 15 is a flowchart of another parking brake engagement processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 16]

FIG. 16 is a flowchart of another parking brake release processing routine that is executed by the automatic transmission ECU shown in FIG. 1.

[FIG. 17]

FIG. 17 is a time chart that shows another engagement operation of the vehicle parking control system.

[FIG. 18]

FIG. 18 is a time chart that shows another engagement release operation of the vehicle parking control system.

Claims

1. A vehicle parking control system, comprising: range selection means that is operated by an operator and that selects a shift range of a drive unit for a desired range;a range-switching device that operates in conjunction with the range selection means and that switches a parking mechanism that is provided in the drive unit to an engaged state and a released state;a parking unit that is operated based on an electric range position signal, which corresponds to the shift range, and that switches a brake unit that is provided in the vehicle to a braking state and a released state; anda control unit that operates the parking unit based on the range position signal of vehicle.

2. A vehicle parking control system, comprising: range selection means that is operated by an operator and that selects a shift range of an automatic transmission for a desired range;a range-switching device that operates in conjunction with the range selection means and that switches a parking mechanism that is provided in the automatic transmission to an engaged state and a released state;a parking unit that is operated based on an electric range position signal, which corresponds to the shift range, and that switches a brake unit that is provided in the vehicle to a braking state and a released state; anda control unit that operates the parking unit based on the range position signal of vehicle.

3. The vehicle parking control system according to claim 1 or 2, wherein the shift range includes a Park range, a Reverse range, a Neutral range, and a Drive range; andthe control unit operates the parking unit when the range position signal is one of a signal to switch the shift range to the Park range and a signal to switch the shift range out of the Park range.

4. The vehicle parking control system according to any one of claims 1 through 3, wherein the range position signal is a range command signal.

5. The vehicle parking control system according to any one of claims 1 through 3, wherein the range position signal is a range state signal.

6. The vehicle parking control system according to claim 4, wherein the range selection means has a function that detects the selected range and outputs a range signal, which is a detection signal, to the control unit; andthe range command signal is the range signal.

7. The vehicle parking control system according to claim 5, wherein the range state signal is a signal that is output to the control unit from range state detection means that detects the shift range state.

8. The vehicle parking control system according to any one of claims 1 through 3, wherein when the range position signal is the signal to switch the shift range to the Park range, the control unit operates the parking unit to switch the brake unit to the braking state.

9. The vehicle parking control system according to any one of claims 1 through 3, wherein when the range position signal is the signal to switch the shift range out of the Park range, the control unit operates the parking unit to switch the brake unit to the released state.

10. The vehicle parking control system according to any one of claims 1 through 3, wherein the range position signal is made up of a range command signal and a range state signal; andthe parking unit is operated according to one of the range command signal and the range state signal.

11. The vehicle parking control system according to any one of claims 1 through 3, wherein the range position signal is made up of a range command signal and a range state signal;the parking unit sets the brake unit to the braking state, according to one of the range command signal and the range state signal; andthe parking unit sets the brake unit to the released state, according to the other of the range command signal and the range state signal.

12. The vehicle parking control system according to claim 8, wherein the brake unit is set to the braking state before the parking mechanism is set to the engaged state.

13. The vehicle parking control system according to claim 9, wherein the brake unit is set to the released state at one of the time when the parking mechanism is set to the released state and a time after the time when the parking mechanism is set to the released state.

14. The vehicle parking control system according to claim 8, wherein the parking unit is structured from at least one of a parking brake unit that operates a parking brake and a wheel brake unit that operates a wheel brake; andone of the parking brake unit and the wheel brake unit is set to the braking state before the parking mechanism is set to the engaged state.

15. The vehicle parking control system according to claim 9, wherein the parking unit is structured from at least one of a parking brake unit that operates a parking brake and a wheel brake unit that operates a wheel brake; andone of the parking brake unit and the wheel brake unit is set to the released state at one of the time when the parking mechanism is set to the released state and a time after the time when the parking mechanism is set to the released state.