阅读说明：本技术 轮胎负荷估计 (Tire load estimation ) 是由 C·斯坦纳 于 2019-07-10 设计创作，主要内容包括：一种用于估计轮胎的轮胎负荷的系统,包括：压力传感器,被配置为生成轮胎压力信号；加速度传感器,被配置为生成轮胎加速度信号；温度传感器,被配置为生成轮胎温度信号；以及至少一个处理器,被配置为基于轮胎加速度信号计算接触印迹的持续时间,基于轮胎加速度信号计算车辆速度,基于轮胎压力信号和轮胎温度信号确定至少一个系统模型系数,以及使用线性系统模型计算轮胎的轮胎负荷,所述线性系统模型将轮胎压力、接触印迹的持续时间以及车辆速度与轮胎的轮胎负荷相关联,其中线性系统模型进一步包括用于计算轮胎的轮胎负荷的至少一个系统模型系数。(A system for estimating a tire load of a tire, comprising: a pressure sensor configured to generate a tire pressure signal; an acceleration sensor configured to generate a tire acceleration signal; a temperature sensor configured to generate a tire temperature signal; and at least one processor configured to calculate a duration of the contact patch based on the tire acceleration signal, calculate a vehicle speed based on the tire acceleration signal, determine at least one system model coefficient based on the tire pressure signal and the tire temperature signal, and calculate a tire load of the tire using a linear system model that relates the tire pressure, the duration of the contact patch, and the vehicle speed to the tire load of the tire, wherein the linear system model further comprises at least one system model coefficient for calculating the tire load of the tire.)

1. A system for estimating a tire load of a tire, comprising:

at least one pressure sensor configured to measure an internal air pressure of the tire and generate at least one tire pressure signal;

at least one acceleration sensor configured to measure acceleration of the tire and generate at least one tire acceleration signal;

at least one temperature sensor configured to measure a temperature of the tire and generate at least one tire temperature signal; and

at least one processor configured to calculate a duration of a contact patch based on the at least one tire acceleration signal, calculate a vehicle speed based on the at least one tire acceleration signal, determine at least one system model coefficient based on the at least one tire pressure signal and the at least one tire temperature signal, and calculate the tire load of the tire using a linear system model that relates tire pressure, the contact time of the contact patch, and the vehicle speed to the tire load of the tire, wherein the linear system model further comprises the at least one system model coefficient for calculating the tire load of the tire.

2. The system of claim 1, wherein the at least one system model coefficient comprises a slope coefficient.

3. The system of claim 2, wherein the at least one processor is configured to: calculating a tire wear of the tire based on the at least one tire acceleration signal, and determining the slope coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, and the tire wear of the tire.

4. The system of claim 2, wherein the at least one processor is configured to: receiving tire information for the tire, and determining the slope coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, and the tire information.

5. The system of claim 2, wherein the at least one processor is configured to: the method further includes calculating tire wear for the tire based on the at least one tire acceleration signal, receiving tire information for the tire, and determining the slope coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, the tire wear for the tire, and the tire information.

6. The system of claim 5, further comprising:

a memory configured to store the tire information, wherein the tire information includes at least one of tire brand information, tire size information, tire material information, tire stiffness parameters, tire tread information, and tire season information.

7. The system of claim 1, wherein the at least one system model coefficient comprises an offset coefficient.

8. The system of claim 7, wherein the at least one processor is configured to: calculating a tire wear of the tire based on the at least one tire acceleration signal, and determining the offset coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, and the tire wear of the tire.

9. The system of claim 7, wherein the at least one processor is configured to: receiving tire information for the tire, and determining the offset coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, and the tire information.

10. The system of claim 7, wherein the at least one processor is configured to: the method further includes calculating tire wear for the tire based on the at least one tire acceleration signal, receiving tire information for the tire, and determining the offset coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, the tire wear for the tire, and the tire information.

11. The system of claim 1, wherein the at least one system model coefficient comprises a slope coefficient and an offset coefficient.

12. The system of claim 1, wherein the linear system model is represented by the equation:

F_load＝k·p·D·v+d,

wherein the at least one system model coefficient includes a slope coefficient k and an offset coefficient D, and p is the tire pressure, D is the duration of the contact patch, v is the vehicle speed, and F_loadIs the tire load of the tire.

13. The system of claim 1, further comprising:

a memory configured to store a tire diameter of the tire,

wherein the at least one processor is configured to: calculating a tire rotation period of the tire based on the at least one tire acceleration signal, and calculating the vehicle speed based on the tire rotation period and the tire diameter.

14. A system for estimating a tire load of a tire, comprising:

a Tire Pressure Monitoring System (TPMS) sensor module, comprising:

at least one pressure sensor configured to measure an internal air pressure of the tire and generate at least one tire pressure signal;

at least one acceleration sensor configured to measure acceleration of the tire and generate at least one tire acceleration signal;

at least one temperature sensor configured to measure a temperature of the tire and generate at least one tire temperature signal;

a microcontroller configured to calculate a duration of a contact footprint based on the at least one tire acceleration signal; and

a transmitter electrically connected to the microcontroller unit and configured to transmit tire pressure, tire temperature, and the duration of the contact footprint; and

a vehicle Electronic Control Unit (ECU) configured to receive the tire pressure, the tire temperature, and the duration of the contact patch from the transmitter, determine at least one system model coefficient based on the tire pressure and the tire temperature, and calculate the tire load of the tire using a linear system model that relates the tire pressure, the duration of the contact patch, and a vehicle speed to the tire load of the tire, wherein the linear system model further includes the at least one system model coefficient for calculating the tire load of the tire.

15. The system of claim 14, wherein the vehicle ECU is configured to calculate the vehicle speed.

16. The system of claim 14, wherein the microcontroller is configured to calculate the vehicle speed based on the at least one tire acceleration signal, and

the transmitter is configured to transmit the vehicle speed to the vehicle ECU.

17. The system of claim 16, wherein the TPMS sensor module further comprises:

a memory configured to store a tire diameter of the tire, an

The microcontroller is configured to calculate a tire rotation period of the tire based on the at least one tire acceleration signal, and calculate the vehicle speed based on the tire rotation period and the tire diameter.

18. The system of claim 14, wherein the at least one system model coefficient comprises a slope coefficient and an offset coefficient.

19. The system of claim 18, wherein:

the microcontroller is configured to calculate tire wear of the tire based on the at least one tire acceleration signal, and the transmitter is configured to transmit the tire wear of the tire to the vehicle ECU, and

the vehicle ECU is configured to determine the slope coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, and the tire wear of the tire, and determine the offset coefficient based on the at least one tire pressure signal, the at least one tire temperature signal, the tire wear of the tire.

20. The system of claim 14, wherein the linear system model is represented by the equation:

F_load＝k·p·D·v+d,

wherein the at least one system model coefficient includes a slope coefficient k and an offset coefficient D, and p is the tire pressure, D is the duration of the contact patch, v is the vehicle speed, and F_loadIs the tire load of the tire.

Technical Field

The present disclosure relates generally to systems and methods for estimating loads or forces acting on vehicle tires, and more particularly to Tire Pressure Monitoring Systems (TPMS) for estimation.

Background

Tire Pressure Monitoring Systems (TPMS) play an important role in vehicle safety and emissions reduction. A large portion of this market is served by direct tire pressure monitoring systems, where each tire contains a TPMS sensor module. Thus, battery-powered sensor modules are assembled inside the tire to monitor its tire pressure. The TPMS sensor module contains a pressure sensor, a microcontroller, a Radio Frequency (RF) transmitter, and a button cell.

While tire pressure is one aspect that may be useful for vehicle safety and system performance, tire load may also be useful. Tire load is the load or force acting on each tire. There may be load sensors in the suspension system, but these sensors may be expensive or inaccurate. Accordingly, there may be a need for an improved method of estimating tire load using a TPMS.

Disclosure of Invention

Drawings

Embodiments are described herein with reference to the drawings.

FIG. 1 illustrates a vehicle system including a Tire Pressure Monitoring System (TPMS) sensor module and a vehicle Electronic Control Unit (ECU) in accordance with one or more embodiments;

FIG. 2 illustrates a vehicle system in which tire loads are output in accordance with one or more embodiments;

FIG. 3 illustrates a TPMS provided in a vehicle in accordance with one or more embodiments; and

fig. 4 shows a flow diagram of a method of estimating a tire load of a tire in accordance with one or more embodiments.

Embodiments provide a system for estimating a tire load of a tire. The system comprises: a pressure sensor configured to measure an internal air pressure of the tire and generate a tire pressure signal; an acceleration sensor configured to measure acceleration of the tire and generate a tire acceleration signal; a temperature sensor configured to measure a temperature of the tire and generate a tire temperature signal; and at least one processor configured to calculate a duration of the contact patch based on the tire acceleration signal, calculate a vehicle speed based on the tire acceleration signal, determine at least one system model coefficient based on the tire pressure signal and the tire temperature signal, and calculate a tire load of the tire using a linear system model that relates the tire pressure, the duration of the contact patch, and the vehicle speed to the tire load of the tire, wherein the linear system model further comprises at least one system model coefficient for calculating the tire load of the tire.

According to another embodiment, a system for estimating tire load of a tire is provided. The system includes a Tire Pressure Monitoring System (TPMS) sensor module and a vehicle Electronic Control Unit (ECU). The TPMS sensor module includes: a pressure sensor configured to measure an internal air pressure of the tire and generate a tire pressure signal; an acceleration sensor configured to measure acceleration of the tire and generate a tire acceleration signal; a temperature sensor configured to measure a temperature of the tire and generate a tire temperature signal; a microcontroller configured to calculate a duration of a contact footprint (contitchbatch) based on the tire acceleration signal; and a transmitter electrically connected to the microcontroller unit and configured to transmit the tire pressure, the tire temperature, and the duration of the contact footprint. The vehicle ECU is configured to receive the tire pressure, the tire temperature, and the duration of the contact patch from the transmitter, determine at least one system model coefficient based on the tire pressure and the tire temperature, and calculate the tire load of the tire using a linear system model that relates the tire pressure, the duration of the contact patch, and the vehicle speed to the tire load of the tire, wherein the linear system model further comprises at least one system model coefficient for calculating the tire load of the tire.