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Methods and systems for estimating road surface friction

A technology of road surface friction coefficient and estimated value, which is applied in the field of estimating road surface friction, and can solve problems such as the inability to accurately predict road surface friction coefficient

Active Publication Date: 2018-02-23
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, these other methods also have the problem of not being able to accurately predict the friction coefficient of the road surface at low SAT values

Method used

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  • Methods and systems for estimating road surface friction
  • Methods and systems for estimating road surface friction
  • Methods and systems for estimating road surface friction

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Embodiment Construction

[0014] The following detailed description is merely exemplary in nature and not intended to limit application and use. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. As used herein, the term "module" refers to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that executes one or more software or firmware programs, combinational logic circuits, and / or other suitable components that provide the described functionality.

[0015] Embodiments of the invention may be described herein in terms of functional and / or logical block components and various processing steps. It should be appreciated that such block components may be realized by any number of hardware, software, and / or firmware components configured to perform the specified functions. For example, embodi...

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Abstract

Methods and systems are provided for determining a road surface friction coefficient and controlling a feature of the vehicle based thereon. In one embodiment, a method includes: receiving signals from an electronic power steering system and an inertial measurement unit; estimating parameters associated with an electronic power steering system model using an iterative optimization method; calculating an electronic power steering system variable using the electronic power steering system model, the estimated parameters and one or more of the received signals; determining whether the calculatedelectronic power steering system variable satisfies a fitness criterion; and when the calculated electronic power steering system variable does satisfy the fitness criterion, determining a road surface friction coefficient based on at least one of the estimated parameters.

Description

technical field [0001] The technical field relates to estimating road surface friction, and more particularly, to the use of tire self-aligning torque in estimating road surface friction and controlling a vehicle based thereon. Background technique [0002] The characteristics of different road surfaces are described by different road surface friction coefficients (μ). For example, a pavement under icy conditions has a low μ value, while a dry asphalt pavement has a high μ value. For example, the coefficient of friction of road surfaces affects vehicle performance by affecting tire grip. [0003] In order to improve the responsiveness of the vehicle to the road surface, the vehicle system attempts to estimate the friction coefficient of the road surface. One method of estimating the friction coefficient of a road surface is to calculate the self-aligning torque (SAT) of the tires of the vehicle, and estimate the value of μ based on the calculated self-aligning torque (SAT)...

Claims

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Application Information

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IPC IPC(8): B60W40/068
CPCB60W40/068B60W2510/202B60W2520/10B60W2520/12B60W2520/14B60T2210/12B60T2260/02G05D1/0061G05D1/0055B60W2552/40B60W40/105B60W40/114B60W50/14B60W2710/202
Inventor Y·萨布里S·E·齐默尔曼Y·司S·T·史怀哲Q·赵张奇N·K·莫什查克
Owner GM GLOBAL TECH OPERATIONS LLC
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