Automotive vehicle control system

• US 6,650,986 B1
• Filed: 11/02/2001
• Issued: 11/18/2003
• Est. Priority Date: 02/05/1999
• Status: Expired due to Fees

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG), Hitachi, Ltd.
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Fennel, Helmut, Lohberg, Peter, Burgdorf, Jochen
• Primary Examiner(s): Chin, Gary
• Application Number:
  US09/890,707
• Time in Patent Office: 746 Days
• Field of Search: 701/29, 701/34, 701/70, 701/71, 701/76, 701/78, 701/92, 340/438, 340/441, 324/166, 73/18.1
• US Class Current: 701/70
• CPC Class Codes: B60T 2240/03 Tire sensors
• CPC Class Codes: B60T 2270/406 Test-mode; Self-diagnosis
• CPC Class Codes: B60T 2270/411 Offset failure
• CPC Class Codes: B60T 8/1725 Using tyre sensors, e.g. Sidewall Torsion sensors [SWT] for tyre pressure and temperature detection B60C23/00
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60T 8/329 Systems characterised by their speed sensor arrangements
• CPC Class Codes: B60T 8/56 having means for changing the coefficient of friction
• CPC Class Codes: B60T 8/885 using electrical circuitry

Abstract

The present invention relates to an automotive vehicle control system, preferably comprising a control logic with at least two control functions, such as ABS and YTC functions, with a tire sensor (tire wall torsion sensor or SWT), i.e., with at least one pick-up for measuring data fitted stationarily on the vehicle body, e.g. a spring strut of a vehicle wheel, and cooperating with at least one encoder applied to the tire wall and co-rotating with the wheel or tire, and with at least one conventional rotational speed sensor that is mounted on the wheel, for example, on the wheel bearing, and includes a measuring data emitter and a pick-up for measuring data, wherein the output information or output signals of the tire sensor and the at least one conventional sensor are correlated and evaluated in an electronic evaluating circuit of the control system to determine vehicle condition variables by means of forces that act on the individual wheels and tires.

Claims

1. A method of operating an automotive vehicle control system, said vehicle control system of the type including an electronic evaluating circuit with at least two control functions, a plurality of tires, wherein each tire includes a tire sensor with at least one corresponding pick-up and wherein each tire also includes at least one encoder applied to a wall of the tire, and at least one conventional rotational speed sensor mounted on each wheel of each tire, wherein an output signal of the tire sensor and an output signal of the at least one conventional sensor are correlated and evaluated in said electronic evaluating circuit to determine vehicle condition variables by the forces that act on the individual wheels and tires, comprising the steps of:

A) collecting the output signals of at least one of the tire sensors and of at least one of the conventional wheel speed sensors,

B) testing the output signals of the at least one tire sensor and of the at least one conventional sensor for correctness with respect to the output signals of one or more of the remaining conventional sensors and tire sensors in order to determine an accurate representation of the actual vehicle'"'"'s wheel rotational speeds, and

C) detecting, within a predetermined period, a deviation beyond a predetermined threshold between the at least one tire sensor signal and the at least one conventional sensor signal,

D) using the at least one tire sensor signal or the at least one conventional sensor signal to generate one or more correction factors for correcting the output signals of one or more of the remaining conventional sensors and time sensors or for correcting vehicle condition variables derived therefrom, and

adapting a control logic based upon the corrected output signals.

2. Automotive vehicle control method as claimed in claim 1, wherein said step of adapting the control logic includes the step of automatically changing over from a first control function to an ABS control function.

3. Automotive vehicle control method as claimed in claim 1, wherein said step of adapting the control logic further includes determining whether the output signals lie in a predetermined tolerance band.

4. Automotive vehicle control method as claimed in claim 1, further including the step of scanning the encoder to determine whether the at least one of said tires is designed with a tire sensor.

5. Automotive vehicle control method as claimed in claim 1, wherein the encoder is designed as a ring that is comprised of magnetic areas or poles applied to the tire side wall.

6. Automotive vehicle control method as claimed in claim 5, wherein the poles are magnetic and are evenly distributed over a periphery of the tire.

7. Automotive vehicle control method as claimed in claim 1, wherein the testing of the output signals of the tire sensor and the conventional sensor further includes the step of detecting a relationship between each signal.

8. Automotive vehicle control method, as claimed in claim 1, said step of generating one or more correction factors including determining or compensating for a shift of a phase position between the tire sensor signal and the one conventional sensor signal, and wherein said compensating step is effected during one or more predetermined driving conditions.

9. Automotive vehicle control method, as claimed in claim 1, wherein the testing of signals for correctness further includes the step of executing a learning method during times of stable driving conditions.

10. Automotive vehicle control method as claimed in claim 9, wherein said stable driving conditions includes at least one of the following conditions:

driving at a constant speed, acceleration of one wheel,

TCS intervention, deceleration of one wheel,

ABS intervention, and

ESP intervention on at least one wheel.

11. Automotive vehicle control method, as claimed in claim 8, further including the step of:

sensing and storing a basic value for the phase position shift while said vehicle is traveling at constant speed.

12. Automotive vehicle control method as claimed in claim 11, further including the step of:

modifying the basic value depending on at least one of the driving conditions by determining the acceleration and the braking forces during positively or negatively accelerated driving.