Use of suspension information in tire pressure deviation detection for a vehicle tire

• US 8,825,267 B2
• Filed: 03/16/2007
• Issued: 09/02/2014
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: Nira Dynamics AB (Volkswagen AG)
• Original Assignee: Nira Dynamics AB (Volkswagen AG)
• Inventors: Gustafsson, Tony, Gerdin, Markus, Nilsson, Henrik, Lfgren, Mats
• Primary Examiner(s): Dager, Jonathan M
• Application Number:
  US12/531,689
• Publication Number:
  US 20110231051A1
• Time in Patent Office: 2,727 Days
• Field of Search: None
• US Class Current: 701/29
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00
• CPC Class Codes: B60C 23/062 Frequency spectrum analysis of wheel speed signals, e.g. using Fourier transformation

Abstract

A method, system and computer program product for detecting a tire pressure deviation in a tire of a vehicle by determining tire pressure indicating data indicative of a tire pressure condition of the tire and determining tire pressure deviation data indicative of a tire pressure deviation in the tire.

Claims

1. An indirect tire pressure monitoring method of detecting tire pressure deviation in tires of a vehicle, comprising:

determining tire pressure indicating data indicative of a tire pressure condition of at least one tire of a vehicle; and

determining tire pressure deviation data indicative of a tire pressure deviation condition in the at least one tire on the basis of the tire pressure indicating data;

characterized by;

obtaining at least one vehicle data provided by a controlling and/or monitoring device of the vehicle;

determining suspension related data on the basis of the at least one vehicle data; and

suspension related compensating on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved,

wherein the suspension related data includes at least one of (i) a current pressure in a suspension acting on the least one tire, and (ii) a height of the suspension acting on the least one tire, and

wherein the at least one vehicle data includes at least one of

vehicle data indicative of suspension stiffness acting on at least one of the at least one tire;

vehicle data indicative of operation of a semi-active or active suspension control system of the vehicle;

vehicle data indicative of at least one of a lateral acceleration and a longitudinal acceleration of the vehicle;

vehicle data indicative of a yaw rate of the vehicle;

vehicle data indicative of a speed of the vehicle;

vehicle data indicative of a steering wheel angle of a steering wheel of the vehicle;

vehicle data indicative of at least one of positioning, orientation and emission direction of at least one head light of the vehicle;

vehicle data indicative of a braking condition of the vehicle;

vehicle data indicative that a braking system of the vehicle is operating;

vehicle data indicative of brake pressure;

vehicle data indicative that at least one active control device of the vehicle is active;

vehicle data indicative of ambient temperature;

vehicle data indicative of an engine torque of an engine of the vehicle;

vehicle data indicative of a torque acting on the at least one tire;

vehicle data indicative of wheel slip related to the at least one tire;

vehicle data indicative of an engine speed of an engine of the vehicle; and

vehicle data indicative that a gear shift of the vehicle is in progress.

2. The method of claim 1, wherein suspension related compensating comprises suspension related compensating the tire pressure indicating data on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved;

and/or

wherein

determining tire pressure deviation data comprises determining individual tire pressure deviation data for each of the at least one tire on the basis of wheel spectrum analysis; and

suspension related compensating comprises suspension related compensating with respect to each of individual tire pressure deviation data on the basis of the suspension related data such that suspension compensated tire pressure deviation data for each of the at least one tire is achieved; and

/or

wherein

determining tire pressure deviation data comprises determining relative tire pressure deviation data for at least two tires of the vehicle on the basis of roll radius based indirect tire pressure monitoring; and

suspension related compensating comprises suspension related compensating with respect to the relative tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for the at least two tires; and

/or

wherein

determining tire pressure deviation data comprises determining relative tire pressure deviation data for at least two tires of the vehicle on the basis of correlation analysis; and

suspension related compensating comprises suspension related compensating with respect to the relative tire pressure deviation data on the basis of the suspension

related data to achieve suspension compensated tire pressure deviation data for the at least two tires; and

/or

wherein the at least one vehicle data includes at least one of

vehicle data indicative of suspension height information related to at least one of the at least one tire;

vehicle data indicative of at least one of current and future control measures of extension and/or height of suspension acting on at least one of the at least one tire;

vehicle data indicative of suspension pressure and/or force acting on at least one of the at least one tire;

vehicle data indicative of a driving condition of the vehicle; and

/or wherein determining the suspension related data comprises computing the at least one vehicle data to calculate or estimate the suspension related data; and

/or wherein obtaining the at least one vehicle data comprises obtaining vehicle data of at least one of;

a 3D position sensor;

a velocity sensor;

an acceleration sensor;

a wheel/tire sensor;

a yaw rate sensor;

a torque sensor;

a suspension sensor; and

temperature sensor; and

/or

wherein suspension related compensating comprises suspension related compensating the at least one vehicle data on the basis of the suspension related data; and

/or

wherein suspension related compensating comprises suspension related compensating the tire pressure indicating data on the basis of the suspension related data; and

/or

wherein suspension related compensating comprises suspension related compensating the tire pressure deviation data itself on the basis of the suspension related data; and

/or

further comprising comparing the tire pressure deviation data with deviation threshold data to determine whether the tire pressure deviation exceeds at least one predetermined deviation related threshold, preferably further comprising correcting the deviation threshold data on the basis of the suspension related data; and

/or

further comprising pausing at least one indirect tire pressure monitoring operation when the suspension related data indicates a suspension condition outside a predefined range and resuming the at least one indirect tire pressure monitoring operation when the suspension related data indicates a suspension condition within the predefined range.

3. An indirect tire pressure monitoring system for detecting tire pressure deviation in tires of a vehicle, comprising:

a roll radius based tire pressure monitoring unit adapted to determine tire pressure indicating data indicative of a tire pressure condition of at least one tire of a vehicle, and to determine tire pressure deviation data indicative of a tire pressure deviation condition in the at least one tire on the basis of the tire pressure indicating data;

characterized by;

an interface adapted to obtain at least one vehicle data provided by a controlling and/or monitoring device of the vehicle;

a combination/compensation unit adapted to determine suspension related data on the basis of the at least one vehicle data, and adapted to suspension related compensate on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved, wherein the combination/compensation unit is adapted to determine suspension related data, and wherein the suspension related data includes at least one of (i) a current pressure in a suspension acting on the least one tire, and (ii) a height of the suspension acting on the least one tire, wherein the interface is adapted to include at least one input for obtaining, as the least one vehicle data, at least one of

vehicle data indicative of suspension height information related to at least one of the at least one tire;

vehicle data indicative of suspension stiffness acting on at least one of the at least one tire;

vehicle data indicative of at least one of current and future control measures of extension and/or height of the suspension acting on at least one of the at least one tire;

vehicle data indicative of operation of a semi-active or active suspension control system of the vehicle;

vehicle data indicative of suspension pressure and/or force acting on at least one of the at least one tire;

vehicle data indicative of at least one of a lateral acceleration and a longitudinal acceleration of the vehicle;

vehicle data indicative of a yaw rate of the vehicle;

vehicle data indicative of a speed of the vehicle;

vehicle data indicative of a steering wheel angle of a steering wheel of the vehicle;

vehicle data indicative of at least one of positioning, orientation and emission direction of at least one head light of the vehicle;

vehicle data indicative of a braking condition;

vehicle data indicative that a braking system of the vehicle is operating;

vehicle data indicative of brake pressure;

vehicle data indicative that at least one active control device of the vehicle is active;

vehicle data indicative of ambient temperature;

vehicle data indicative of an engine torque of an engine of the vehicle;

vehicle data indicative of a torque acting on the at least one tire;

vehicle data indicative of wheel slip related to the at least one tire;

vehicle data indicative of an engine speed of an engine of the vehicle; and

vehicle data indicative that a gear shift of the vehicle is in progress; and

/or

wherein the combination/compensation unit is adapted to compute the at least one vehicle data to calculate or estimate the suspension related data; and

/or

wherein the interface is adapted to suspension related compensate the at least one vehicle data based on the suspension related data; and

/or

wherein the interface is adapted to obtain vehicle data of at least one of;

a 3D position sensor;

a velocity sensor;

an acceleration sensor;

a wheel/tire sensor;

a yaw rate sensor;

a torque sensor;

a suspension sensor; and

temperature sensor; and

/or

wherein the combination/compensation unit is adapted to suspension related compensate the tire pressure indicating data on the basis of the suspension related data; and

/or

wherein the combination/compensation unit is adapted to suspension related compensate the tire pressure deviation data itself on the basis of the suspension related data; and

/or

wherein the combination/compensation unit is adapted to compare the tire pressure deviation data with deviation threshold data and adapted to determine, based on the comparison result, whether the tire pressure deviation condition exceeds at least one predetermined deviation related threshold; and

/or

wherein the combination/compensation unit is preferably adapted to correct the deviation threshold data on the basis of the suspension related data.

4. The system of claim 3, wherein the combination/compensation unit is adapted to suspension related compensate the tire pressure indicating data on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved;

and/or

wherein

the roll radius based tire pressure monitoring unit is adapted to determine individual tire pressure deviation data for each of the at least one tire on the basis of wheel spectrum analysis; and

the combination/compensation unit is adapted to suspension related compensate with respect to the individual tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for each of the at least one tire; and

/or

wherein

the roll radius based tire pressure monitoring unit is adapted to determine relative tire pressure deviation data for at least two tires of the vehicle on the basis of roll radius based on indirect tire pressure monitoring; and

the combination/compensation unit is adapted to suspension related compensate with respect to the relative tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for the at least two tires together; and

/or

wherein

the combination/compensation unit is adapted to determine relative tire pressure deviation data for at least two tires of the vehicle on the basis of correlation analysis; and

the combination/compensation unit is adapted to suspension related compensate the tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for at least two tires; and

/or the interface is adapted to include at least one input for obtaining, as the least one vehicle data, at least one of

vehicle data indicative of suspension height information related to at least one of the at least one tire;

vehicle data indicative of at least one of current and future control measures of extension and/or height of suspension means acting on at least one of the at least one tire;

vehicle data indicative of suspension pressure and/or force acting on at least one of the at least one tire;

vehicle data indicative of a driving condition of the vehicle; and

/or

wherein the combination/compensation unit is adapted to compute the at least one vehicle data to calculate or estimate the suspension related data; and

/or

wherein the combination/compensation unit is adapted to suspension related compensate the at least one vehicle data based on the suspension related data; and

/or

wherein the interface is adapted to obtain vehicle data of at least one of;

a 3D position sensor;

a velocity sensor;

an acceleration sensor;

a wheel/tire sensor;

a yaw rate sensor;

a torque sensor;

a suspension sensor; and

temperature sensor; and

/or

wherein the combination/compensation unit is adapted to suspension related compensate the tire pressure indicating data on the basis of the suspension related data; and

/or

wherein the combination/compensation unit is adapted to suspension related compensate the tire pressure deviation data itself on the basis of the suspension related data; and

/or

wherein the combination/compensation unit is adapted to compare the tire pressure deviation data with deviation threshold data and is adapted to determine, based on the comparison result, whether the tire pressure deviation condition exceeds at least one predetermined deviation related threshold; and

/or

wherein the combination/compensation unit is preferably adapted to correct the deviation threshold data on the basis of the suspension related data; and

/or

wherein the combination/compensation unit is adapted to disable at least one of the roll radius based tire pressure monitoring unit, the interface, and the combination/compensation unit when the suspension related data indicates a suspension condition outside a predefined range and is adapted to enable at least one of the roll radius based tire pressure monitoring unit, the interface, and the combination/compensation unit when the suspension related data indicates a suspension condition within the predefined range.

5. A non-transitory computer program product for an indirect tire pressure monitoring for detecting tire pressure deviation in tires of a vehicle, the computer program product comprising program code for carrying out, when executed on a processing system:

determining tire pressure indicating data indicative of a tire pressure condition of at least one tire of a vehicle; and

determining tire pressure deviation data indicative of a tire pressure deviation condition in the at least one tire on the basis of the tire pressure indicating data;

characterized by;

obtaining at least one vehicle data provided by a controlling and/or monitoring device of the vehicle;

determining suspension related data on the basis of the at least one vehicle data; and

suspension related compensating on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved,

wherein the suspension related data includes at least one of (i) a current pressure in a suspension acting on the least one tire, and (ii) a height of the suspension acting on the least one tire, and

wherein the at least one vehicle data includes at least one of

vehicle data indicative of suspension stiffness acting on at least one of the at least one tire;

vehicle data indicative of operation of a semi-active or active suspension control system of the vehicle;

vehicle data indicative of at least one of a lateral acceleration and a longitudinal acceleration of the vehicle;

vehicle data indicative of a yaw rate of the vehicle;

vehicle data indicative of a speed of the vehicle;

vehicle data indicative of a steering wheel angle of a steering wheel of the vehicle;

vehicle data indicative of at least one of positioning, orientation and emission direction of at least one head light of the vehicle;

vehicle data indicative of a braking condition of the vehicle;

vehicle data indicative that a braking system of the vehicle is operating;

vehicle data indicative of brake pressure;

vehicle data indicative that at least one active control device of the vehicle is active;

vehicle data indicative of ambient temperature;

vehicle data indicative of an engine torque of an engine of the vehicle;

vehicle data indicative of a torque acting on the at least one tire;

vehicle data indicative of wheel slip related to the at least one tire;

vehicle data indicative of an engine speed of an engine of the vehicle; and

vehicle data indicative that a gear shift of the vehicle is in progress.

6. The non-transitory computer program product of claim 5, further comprising program code for carrying out, when executed on a processing

system, at least one of the alternatives of wherein suspension related compensating comprises suspension related compensating the tire pressure indicating data on the basis of the suspension related data such that suspension compensated tire pressure deviation data is achieved;

and/or

wherein

determining tire pressure deviation data comprises determining individual tire pressure deviation data for each of the at least one tire on the basis of wheel spectrum analysis; and

suspension related compensating comprises suspension related compensating with respect to each of individual tire pressure deviation data on the basis of the suspension related data such that suspension compensated tire pressure deviation data for each of the at least one tire is achieved; and

/or

wherein

determining tire pressure deviation data comprises determining relative tire pressure deviation data for at least two tires of the vehicle on the basis of roll radius based indirect tire pressure monitoring; and

suspension related compensating comprises suspension related compensating with respect to the relative tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for the at least two tires; and

/or

wherein

determining tire pressure deviation data comprises determining relative tire pressure deviation data for at least two tires of the vehicle on the basis of correlation analysis; and

suspension related compensating comprises suspension related compensating with respect to the relative tire pressure deviation data on the basis of the suspension related data to achieve suspension compensated tire pressure deviation data for the at least two tires; and

/or

wherein the at least one vehicle data includes at least one of

vehicle data indicative of suspension height information related to at least one of the at least one tire;

vehicle data indicative of at least one of current and future control measures of extension and/or height of the suspension acting on at least one of the at least one tire;

vehicle data indicative of suspension pressure and/or force acting on at least one of the at least one tire;

vehicle data indicative of a driving condition of the vehicle; and

/or

wherein determining the suspension related data comprises computing the at least one vehicle data to calculate or estimate the suspension related data; and

/or

wherein obtaining the at least one vehicle data comprises obtaining vehicle data of at least one of;

a 3D position sensor;

a velocity sensor;

an acceleration sensor;

a wheel/tire sensor;

a yaw rate sensor;

a torque sensor;

a suspension sensor; and

temperature sensor; and

/or

wherein suspension related compensating comprises suspension related compensating the at least one vehicle data on the basis of the suspension related data; and

/or

wherein suspension related compensating comprises suspension related compensating the tire pressure indicating data on the basis of the suspension related data; and

/or

wherein suspension related compensating comprises suspension related compensating the tire pressure deviation data itself on the basis of the suspension related data; and

/or

further comprising comparing the tire pressure deviation data with deviation threshold data to determine whether the tire pressure deviation exceeds at least one predetermined deviation related threshold, preferably further comprising correcting the deviation threshold data on the basis of the suspension related data; and

/or

further comprising pausing at least one indirect tire pressure monitoring operation when the suspension related data indicates a suspension condition outside a predefined range and resuming the at least one indirect tire pressure monitoring operation-when the suspension related data indicates a suspension condition within the predefined range; and

/or

being stored on a computer-readable storage medium or in a computer-readable storage device.