Method and device for adaptive control of separation distance and/or driving speed of a motor vehicle

• US 20010032048A1
• Filed: 04/13/2001
• Published: 10/18/2001
• Est. Priority Date: 04/17/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Winner, Hermann, Hellmann, Manfred, Lauxmann, Ralph
• Granted Patent: US 6,615,127 B2
• Time in Patent Office: Days
• US Class Current: 701/96
• CPC Class Codes: B60K 31/0008 including means for detecting potential obstacles in vehicle path
• CPC Class Codes: B60T 2230/04 Jerk, soft-stop; Anti-jerk, reduction of pitch or nose-dive when braking
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/16 Control of distance between vehicles, e.g. keeping a distance to preceding vehicle

Abstract

A method and device for adaptive control of separation distance and/or driving speed of a motor vehicle, at least in a first operational mode an engine of the motor vehicle and in a second operational mode a brake of the motor vehicle being able to be activated as a function of a magnitude, representing an acceleration, the magnitude representing the setpoint acceleration is formed and/or limited at least as a function of at least one base value.

Claims

1. A method for an adaptive control of at least one of a separation distance and a driving speed of a motor vehicle, comprising:

at least one of forming and limiting a setpoint acceleration value as a function of at least one base value; and

activating an engine of the vehicle in a first operational mode and a brake of the vehicle in a second operational mode, as a function of the setpoint acceleration value.

2. The method according to

claim 1

, further comprising limiting a change over time of the setpoint acceleration value in a positive direction and a negative direction as a function of determinable boundary values.

3. The method according to

claim 2

, wherein the setpoint acceleration value is limited as a function of a cycle time of at least one of a control unit and a regulator.

4. The method according to

claim 3

, wherein the setpoint acceleration value is determined from the following relationship:

aSoll=MAX(aBaseMin−

aMinus·

dt, MIN(aSoll, aBaseMax+aPlus·

dt)).

5. The method according to

claim 1

, further comprising setting the at least one base value to an initial value at at least one of an initialization and a transition into an active separation distance/driving speed control mode, the initial value being a function of at least one of an engine momentum actual value, a charge actual value, and an estimated gradient coefficient of a road for the vehicle.

6. The method according to

claim 1

, further comprising determining the at least one base value, in a first drive mode, as a function of an actual base value and a last value representing a setpoint acceleration.

7. The method according to

claim 1

, further comprising determining the at least one base value, in a second drive mode, as a function of (a) a feedback base value from at least one of a delay regulator and an active brake and (b) a last value representing a setpoint acceleration.

8. A device for an adaptive control of at least one of a separation distance and a driving speed of a motor vehicle, comprising:

means for at least one of forming and limiting a setpoint acceleration value as a function of at least one base value; and

means for activating an engine of the vehicle in a first operational mode and a brake of the vehicle in a second operational mode, as a function of the setpoint acceleration value.