Method and device for operating a vehicle having an internal combustion engine

• US 20050133006A1
• Filed: 12/17/2004
• Published: 06/23/2005
• Est. Priority Date: 12/20/2003
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kufferath, Andreas, Frenz, Thomas
• Application Number:
  US11/016,614
• Publication Number:
  US 20050133006A1
• Time in Patent Office: Days
• US Class Current: 123/399
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• 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 2250/21 during a transition between engine operation modes or states
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0005 during deceleration
• 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 41/12 for deceleration F02D41/0005, F02D41/107 take precedence
• CPC Class Codes: F02D 41/123 the fuel injection being cut-off
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 9/02 concerning induction conduits throttle valves, or arrangements thereof in conduits F02D9/08

Abstract

A method and a device are provided for operating a vehicle having a combustion engine, which result in reduced fuel consumption in overrun operation. In the process, the air supply to the combustion engine is adjusted via an actuator. In overrun operation of the combustion engine, an opening degree of the actuator is set as a function of a driving situation.

Claims

1. A method for operating a vehicle having a combustion engine where the air supply to the combustion engine is adjusted via an actuator, the method comprising:

in overrun operation of the combustion engine, adjusting an opening degree of the actuator as a function of a driving situation.

2. The method as recited in claim 1, further comprising:

evaluating a gradient of a variable derived from an actuation of an accelerator to ascertain the driving situation.

3. The method as recited in claim 2, further comprising:

if the gradient is below a specified threshold value, reducing the opening degree of the actuator in the direction of a closed position of the actuator; and

if the gradient is above the specified threshold value, increasing the opening degree of the actuator in a direction of a complete opening of the actuator.

4. The method as recited in claim 2, further comprising:

ascertaining the opening degree of the actuator to be set in overrun operation or a variable characterizing the opening degree as a function of the gradient of the variable derived from the actuation of the accelerator using a characteristic curve or a characteristics map.

5. The method as recited in claim 1, further comprising:

determining the driving situation by analyzing an activation of a brake pedal.

6. The method as recited in claim 5, further comprising:

when the brake pedal is depressed, reducing the opening degree of the actuator in the direction of closed position of the actuator; and

when the brake pedal is released, increasing the opening degree of the actuator in a direction of complete opening of the actuator.

7. The method as recited in claim 1, further comprising:

ascertaining the driving situation by analyzing information regarding an inclination of the vehicle relative to a horizontal line.

8. The method as recited in claim 7, further comprising:

when a magnitude of the inclination exceeds a specified threshold value, reducing an opening degree of the actuator in a direction of a closed position of the actuator; and

when the magnitude of the inclination does not achieve the specified threshold value, increasing the opening degree of the actuator in a direction of a complete opening of the actuator.

9. The method as recited in claim 1, further comprising:

ascertaining the driving situation is ascertained by analyzing a driving speed.

10. The method as recited in claim 1, further comprising:

when a fault is detected in a safety-relevant component of the vehicle or the combustion engine, reducing an opening degree of the actuator in a direction of a closed position of the actuator.

11. A device for operating a vehicle having a combustion engine and an actuator for adjusting an air supply to the combustion engine, comprising:

a control device configured to adjust an opening degree of the actuator as a function of a driving situation, in overrun operation.