Process for finding the transverse acceleration of a vehicle

• US 5,968,105 A
• Filed: 09/25/1997
• Issued: 10/19/1999
• Est. Priority Date: 08/27/1994
• Status: Expired due to Term

• Current Assignee: ITT Manufacturing Enterprises, Inc. (ITT, Inc.)
• Original Assignee: ITT Manufacturing Enterprises, Inc. (ITT, Inc.)
• Inventors: Volz, Alexander, Burkhard, Dieter, Dornseiff, Manfred, Schwartz, Jean-Claude
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): DONNELLY, ARTHUR D
• Application Number:
  US08/793,506
• Time in Patent Office: 754 Days
• Field of Search: 701/70, 701/68, 701/69, 701/73, 701/75, 701/41, 701/72, 702/141, 73/146.2
• US Class Current: 701/70
• CPC Class Codes: B60G 17/01908 Acceleration or inclination sensors characterised by the use of gyroscopes B60G21/08
• CPC Class Codes: B60G 17/0195 characterised by the regulation being combined with other vehicle control systems conjoint control of vehicle sub-units including control of suspension systems B60W10/22
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/106 longitudinal with regard to vehicle, e.g. braking
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• CPC Class Codes: G01P 15/00 Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
• CPC Class Codes: G01P 15/16 by evaluating the time-derivative of a measured speed signal

Abstract

To determine the transverse acceleration of a vehicle, in particular as an input quantity for an electronic vehicle control system such as ABS, TCS, EBV, etc., the output signals of wheel sensors representative of the rotational behavior of the individual vehicle wheels are evaluated. The correction factors representing the differences of the tire tread circumferences of the individual wheels are determined. A short-time correction factor and a long-time correction factor KZ and LZ are produced in each case for the non-driven vehicle wheels. A difference between the long-time correction factor and the short-time correction factor of the respective wheel is determined and evaluated in a filtering and adapting circuit. The quotient KZ/LZ of the short-time correction factor and the long-time correction factor of the respective wheel is calculated, and the difference is produced between the quotients of the left and right non-driven ##EQU1## wheels. The transverse acceleration of the vehicle Q_FZ is the result of the relation

Claims

1. A method of determining the transverse acceleration of a vehicle, in particular as an input quantity for an electronic vehicle control system, wherein

the transverse acceleration of the vehicle is determined on the basis of the output signals of wheel sensors representing the rotational behavior of the individual vehicle wheels, in consideration of correction factors which determine the differences of the tire tread circumferences, by producing short-time correction factors and long-time correction factors at least for the non-driven vehicle wheels,

the difference between the long-time correction factor and the short-time correction factor of the respective non-driven wheel is determined and evaluated in a filtering and adapting circuit,

the long-time correction factor is corrected as a function of the signal produced in the filtering and adapting circuit,

the quotient of the short-time correction factor and the long-time correction factor of the respective wheel is produced,

the difference between the quotient produced from the short-time and long-time correction factors of the two non-driven wheels is produced, and

the transverse acceleration is produced from these quotients according to the relation ##EQU5## wherein Q_FZ is the transverse acceleration of the vehicle, ##EQU6## is the quotient of the short-time correction factor and the long-time correction factor of the non-driven left wheel, ##EQU7## is the quotient of the short-time correction factor and the long-time correction factor of the non-driven right wheel,

V_FZ is the vehicle speed or vehicle reference speed,

K is k1(k2×

SpW);

k1,k2 are constants,

SpW is the tire tread width of the vehicle.

2. The method as claimed in claim 1 wherein a long-time average value of the difference between the long-time correction factor and the short-time correction factor of the respective wheel is produced in the filtering and adapting circuit by a low-pass filter, and in that a partial value of the long-time average value is evaluated for the correction of the long-time correction factor as a function of the long-time average value of the other wheels.