VEHICULAR CONTROL DEVICE AND METHOD OF CONTROLLING A VEHICLE

• US 20100198449A1
• Filed: 07/29/2008
• Published: 08/05/2010
• Est. Priority Date: 09/13/2007
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tanaka, Yuichi, Ueoka, Kiyoshiro
• Application Number:
  US12/678,183
• Publication Number:
  US 20100198449A1
• Time in Patent Office: Days
• US Class Current: 701/29
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 15/2081 for drive off on a slope
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/22 Standstill, e.g. zero speed
• CPC Class Codes: B60T 2201/06 Hill holder; Start aid systems on inclined road
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• CPC Class Codes: B60T 7/122 for locking of reverse movement
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

In a vehicle having a brake hold control function an ECU cancels brake hold control when an actual value of a degree of operation of the accelerator pedal is larger than a predetermined degree. The ECU calculates a rate of increasing the vehicle'"'"'s requested driving force after the brake hold control is cancelled such that the rate is larger for longer times having elapsed since the brake hold control was cancelled and the rate is also larger for larger actual values of the degree of operation of the accelerator pedal, as shown in FIG. 6.

Claims

1. A vehicular control device for a vehicle having a brake hold control function causing a braking device to operate to hold a braking force while a driver of said vehicle does not press a brake pedal, and stopping said braking device from operating when a degree of acceleration requested by the driver is larger than a predetermined degree, the vehicular control device comprising:

a detection unit that detects said degree requested; and

a control unit connected to said detection unit, wherein while said brake hold control is exerted, said control unit determines whether said degree requested, as detected by said detection unit, exceeds said predetermined degree, and said control unit detects a period of time having elapsed since said degree requested exceeded said predetermined degree, and for said degree requested having exceeded said predetermined degree, before said period of time having elapsed exceeds a predetermined time, said control unit sets a degree of increasing requested driving force, as based on said period of time having elapsed and said degree requested, calculates said requested driving force, as based on said degree as set of increasing said requested driving force, and controls force driving said vehicle, as based on said requested driving force as calculated.

2. The vehicular control device according to claim 1, wherein said control unit sets an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said degree requested.

3. The vehicular control device according to claim 1, wherein said control unit sets an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said period of time having elapsed.

4. The vehicular control device according to claim 1, wherein:

said braking device is a hydraulic braking device; and

said predetermined time is set as based on a period of time elapsing after said braking device starts to reduce a pressure of a brake fluid before said braking device completes reducing said pressure of said brake fluid.

5. A vehicular control device for a vehicle having a brake hold control function causing a braking device to operate to hold a braking force while a driver of said vehicle does not press a brake pedal, and stopping said braking device from operating when a degree of acceleration requested by the driver is larger than a predetermined degree, the vehicular control device comprising:

a device that calculates requested driving force based on a state of said vehicle; and

a device that controls force driving said vehicle, as based on said requested driving force, said device that calculates requested driving force including;

a device that detects said degree requested;

a device that determines whether said degree requested exceeds said predetermined degree while said brake hold control is exerted;

a device that detects a period of time having elapsed since said degree requested exceeded said predetermined degree;

a setting device that sets a degree of increasing said requested driving force, as based on said period of time having elapsed and said degree requested, for said degree requested having exceeded said predetermined degree, before said period of time having elapsed exceeds a predetermined time; and

a device that calculates said requested driving force based on said degree of increasing said requested driving force.

6. The vehicular control device according to claim 5, wherein said setting device includes a device that sets an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said degree requested.

7. The vehicular control device according to claim 5, wherein said setting device includes a device that sets an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said period of time having elapsed.

8. The vehicular control device according to claim 5, wherein:

said braking device is a hydraulic braking device; and

said predetermined time is set as based on a period of time elapsing after said braking device starts to reduce a pressure of a brake fluid before said braking device completes reducing said pressure of said brake fluid.

9. A method for controlling a vehicle having a brake hold control function causing a braking device to operate to hold a braking force while a driver of said vehicle does not press a brake pedal, and stopping said braking device from operating when a degree of acceleration requested by the driver is larger than a predetermined degree, the method comprising—

the steps of;

calculating requested driving force based on a state of said vehicle; and

controlling force driving said vehicle, as based on said requested driving force, the step of calculating including the steps of;

detecting said degree requested;

determining whether said degree requested exceeds said predetermined degree while said brake hold control is exerted;

detecting a period of time having elapsed since said degree requested exceeded said predetermined degree;

setting a degree of increasing said requested driving force, as based on said period of time having elapsed and said degree requested, for said degree requested having exceeded said predetermined degree, before said period of time having elapsed exceeds a predetermined time; and

calculating said requested driving force based on said degree of increasing said requested driving force.

10. The method for controlling a vehicle according to claim 9, wherein the step of setting includes the step of setting an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said degree requested.

11. The method for controlling a vehicle according to claim 9, wherein the step of setting includes the step of setting an amount by which said requested driving force is increased per unit time to be larger amounts for larger values of said period of time having elapsed.

12. The method for controlling a vehicle according to claim 9, wherein:

said braking device is a hydraulic braking device; and

said predetermined time is set as based on a period of time elapsing after said braking device starts to reduce a pressure of a brake fluid before said braking device completes reducing said pressure of said brake fluid.