Method and device for recognising raised wheels of a vehicle

• US 20040158368A1
• Filed: 03/31/2004
• Published: 08/12/2004
• Est. Priority Date: 02/27/2002
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Haas, Hardy
• Granted Patent: US 7,142,958 B2
• Time in Patent Office: Days
• US Class Current: 701/29
• CPC Class Codes: B60R 16/0233 Vehicle tilting, overturning or roll over
• CPC Class Codes: B60T 2230/03 Overturn, rollover

Abstract

A method of detecting a transverse-dynamically hazardous operating state of a vehicle, where

a variable describing the rotational speed of at least one wheel on an axle is determined;

a first variable describing the vehicle transverse dynamics is determined from at least the one variable describing the wheel rotational speed;

at least one second variable describing the vehicle transverse dynamics is determined from sensor signals; and

the transverse-dynamically hazardous state is detected at least as a function of the first variable describing the vehicle transverse dynamics and the second variable describing the vehicle transverse dynamics.

The transverse-dynamically hazardous operating state is defined by this wheel on the axle lifting off the roadway or by an imminent danger of this wheel lifting off the roadway; and

the transverse-dynamically hazardous operating state is detected as a function of the engine torque (Mmot) acting upon this axle.

Claims

1. A method of detecting a transverse-dynamically hazardous operating state of a vehicle, where

a variable (v) describing the rotational speed of at least one wheel on an axle is determined;

a first variable (aq1) describing the vehicle transverse dynamics is determined from at least the one variable describing the wheel rotational speed;

at least one second variable (aq2) describing the vehicle transverse dynamics is determined from sensor signals; and

the transverse-dynamically hazardous state is detected at least as a function of the first variable (aq1) describing the vehicle transverse dynamics and the second variable (aq2) describing the vehicle transverse dynamics,

wherein

the transverse-dynamically hazardous operating state is defined by this wheel on the axle lifting off the roadway or by an imminent danger of this wheel lifting off the roadway; and

the transverse-dynamically hazardous operating state is detected as a function of the engine torque (Mmot) acting upon this axle.

2. The method as recited in claim 1,

wherein the imminent danger of wheel lift is characterized by the fact that the slip of this wheel on the axle has a value that is substantially different from zero.

3. The method as recited in claim 1,

wherein the first and second variables describing the vehicle transverse dynamics are variables (aq1, aq2) representing the transverse acceleration.

4. The method as recited in claim 1,

wherein, while determining the transverse-dynamically hazardous operating state, a distinction is made as to whether the axle is a driven or a non-driven axle.

5. The method as recited in claim 4,

wherein, in the event that the axle is driven (AN), a determination is made as to whether the vehicle is in acceleration or overrun mode by evaluating the engine torque acting upon this axle.

6. The method as recited in claim 3,

wherein the transverse-dynamically hazardous operating state is detected only if the amount of transverse acceleration exceeds a predefinable threshold value (S1).

7. The method as recited in claim 1,

wherein the transverse-dynamically hazardous operating state is detected by evaluating inequations which include the first variable (aq1) describing the vehicle transverse dynamics and the second variable (aq2) describing the vehicle transverse dynamics;

and the form of the inequations is determined by the engine torque (Mmot) acting upon the wheel axle.

8. A device for detecting a transverse-dynamically hazardous operating state of a vehicle, comprising

wheel rotational-speed sensing means for determining a variable (v) describing the rotational speed of at least one wheel on an axle;

first vehicle transverse-dynamics determining means for determining a first variable (aq1) describing the vehicle transverse dynamics from at least the one variable describing the wheel rotational speed;

second vehicle transverse-dynamics determining means for determining a second variable (aq2) describing the vehicle transverse dynamics at least from sensor signals; and

operating-state detection means for detecting the transverse-dynamically hazardous operating state at least as a function of the first variable (aq1) describing the vehicle transverse dynamics and the second variable (aq2) describing the vehicle transverse dynamics,

wherein

the transverse-dynamically hazardous operating state is defined by this wheel on this axle lifting off the roadway or by an imminent danger of this wheel lifting off the roadway; and

the operating-state detection means are designed in such a way that the transverse-dynamically hazardous operating state is detected as a function of the engine torque (Mmot) acting upon this axle.