Method of associating tire pressure control apparatuses to wheel positions

Patent metadata

Field	Value
Publication number	US-9902216-B2
Application number	US-201514705803-A
Country	US
Kind code	B2
Filing date	May 6, 2015
Priority date	Nov 8, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Tire pressure control devices include first sensors to deliver repeatedly a measured value M 1 for the rotation speed of the wheel. A measurand, from which the rotation speed of the associated wheel can be derived, is detected in a pointwise manner by means of a second sensor over a predetermined rotation angle φ of the wheel as a function of time, is subjected to a low pass filtering in a subsequent first time interval Δt 1 and from the filtered development of the measurand a second measured value M 2 is determined, which is a measurement for the rotation speed or respectively for the angular speed of the associated wheel. Each tire pressure control device transmits at the end of a second time interval Δt 2 the second measured value M 2 together with an identification of the tire pressure control device to a central unit. Comparing M 1 and M 2 determines wheel position.

First claim

What is claimed is:

1. A method for the allocating of tire pressure control devices of a tire pressure control system of a vehicle to the different positions at which respectively a wheel of the vehicle is mounted, automatically by the tire pressure control system, the method comprising the steps of:
providing the tire pressure control system, the system comprising:
a number of first sensors, corresponding to the number of wheel positions, which are each fixedly allocated to one of the wheel positions and can detect a rotation speed or an angular speed of the wheel which is mounted in the wheel position;
a number of tire pressure control devices, coinciding with the number of the mounted wheels, which devices are mounted on the wheels rotating together with these, are provided with an individual identification and contain a second sensor for determining a measurand, from the chronological development of which the rotation speed of the respective wheel or the angular speed of the wheel can be derived;
a central unit, in which the allocation of the tire pressure control devices to respectively one wheel position, namely the identification of the tire pressure control device situated in the wheel position in connection with the associated wheel position, can be stored;
wherein it is known by the central unit from this method which first sensor is allocated to which wheel position;

delivering, by the first sensors, repeatedly a measured value M 1 for successive time segments ΔT, the measured value M 1 being a measurement for the rotation speed or for the angular speed of the wheel to which the respective first sensor is allocated;
sending, by the tire pressure control devices, their individual identification to the central unit in chronological intervals;
wherein in each rotating tire pressure control device there are performed the steps of:
detecting, by each rotating tire pressure control device, pointwise the development of the measurand from which the rotation speed or the angular speed of the associated wheel can be derived by means of the second sensor over a predetermined rotation angle φ of the wheel as a function of time;
low pass filtering, by each rotating tire pressure control device, of the chronological development of the measurand in a first time interval Δt 1 following the detection of the measurand detected during the rotation of the wheel about the predetermined rotation angle φ;
storing, by each rotating tire pressure control device, the result of the filtering;
determining, by each rotating tire pressure control device, a second measured value M 2 from the filtered development of the measurand, which is a measurement for the rotation speed or respectively for the angular speed of the associated wheel in the range of the observed predetermined rotation angle φ;

transmitting, by each tire pressure control device, the second measured value M 2 together with its identification to the central unit at the end of a second time interval Δt 2 , the duration of which is not less than the first time interval Δt 1 ;
comparing, in the central unit as a result of this transmittal, the second measured values M 2 transmitted by the tire pressure control devices with the measured values M 1 detected in a timely manner by the first sensors of all wheels; and
storing, in the central unit, the identification of the tire pressure control device respectively under that wheel position in which the measured value M 1 delivered by the first sensor best coincides with the measured value M 2 .

2. The method according to claim 1 , wherein as first sensors anti-lock braking system (ABS) sensors are used, of which in each case one ABS sensor is allocated to one of the wheel positions of the vehicle.

3. The method according to claim 1 , wherein the duration of the second time interval Δt 2 is constant.

4. The method according to claim 1 , wherein the end of the first time interval Δt 1 is placed such that it coincides with the moment at which the end of the filtered development of the measurand detected by the second sensor has left the low pass filter and is stored in the tire pressure control device.

5. The method according to claim 1 , wherein the measured value M 2 , if applicable also the measured value M 3 , is additionally used in the central unit in order to determine the angular position which the wheel has at the end of the first time interval Δt 1 and/or at the end of the second time interval Δt 2 .

6. The method according to claim 1 , wherein more than one identification is stored in the central unit for each wheel position.

7. The method according to claim 1 , wherein the tire pressure control devices send in shorter time intervals in the allocation method than in a normal operation of the tire pressure control system, in which only identifications which are already stored in the central unit are transmitted to the central unit from all tire pressure control devices.

8. The method according to claim 1 , in which a low pass filter is used, the threshold frequency of which lies between 1 Hz and 5 Hz.

9. The method according to claim 1 , wherein as measured values M 1 detected in a timely manner, those measured values M 1 are selected which were measured in not more than five successive time segments ΔT, wherein the end of the second time interval Δt 2 , in which in a tire pressure control device a low pass filtering of the development of the measurand detected by the second sensor and the transmittal of the second measured value M 2 as well as the identification to the central unit takes place, lies in the no more than five time segments ΔT or at the boundary thereof.

10. The method according to claim 1 , wherein the second measured values M 2 are transmitted twice to the central unit, namely once at the end of the second time interval Δt 2 and a second time after a further rotation of the wheel about less than one revolution.

11. The method according to claim 1 , wherein as second sensor such a sensor is used which delivers a signal with a periodic development, wherein the period is constant as long as the vehicle moves in a straight line with a constant speed.

12. The method according to claim 11 , wherein as second sensors acceleration sensors are used, at least one of which is contained in each tire pressure control device.

13. The method according to claim 1 , wherein as measured values M 1 detected in a timely manner, those measured values are selected which were measured in several successive time segments ΔT, which overlap with the second time interval Δt 2 or lie at its boundary.

14. The method according to claim 13 , wherein as measured values M 1 detected in a timely manner, the measured values M 1 are selected which were measured in two successive time segments ΔT.

15. The method according to claim 1 , wherein it is carried out repeatedly, wherein the allocations obtained in each run of the method are collected in the central unit, wherein the collected allocations are analyzed according to the frequency of their occurrence, and wherein for each wheel position the identification is stored which is allocated to it the most frequently.

16. The method according to claim 15 , wherein after a start of a journey it is then carried out in a shortened manner, i.e. with a smaller number of repetitions than with a storage for the first time of a particular allocation, if, to the given wheel positions, that identification, which was already stored during the preceding journey as the most frequent identification, is transmitted again to the central unit.

17.

Assignees

• Huf Huelsbeck & Fuerst Gmbh & Co Kg

Inventors

• Wagner Markus
• Brand Peter
• Alexander Markus

Classifications

• G01P15/00

  Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration · CPC title

• G01P3/00

  Measuring linear or angular speed; Measuring differences of linear or angular speeds (G01P5/00 - G01P11/00 take precedence; {direction and speed indication G01P13/045}; counting mechanisms G06M) · CPC title

• B60C23/04 Primary

  mounted on the wheel or tyre · CPC title

• B60C23/0416 Primary

  allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right · CPC title

• B60C23/0489

  for detecting the actual angular position of the monitoring device while the wheel is turning · CPC title