Torque adjusting method of electric automobile adaptive cruise system

An adaptive cruise, electric vehicle technology, applied in the automotive field, can solve problems such as the cruise torque adjustment method that is not described in detail, and achieve the effect of fast feedforward adjustment, good driving feeling, and fast stable state.

Active Publication Date: 2018-09-14
CHONGQING UNIV OF POSTS & TELECOMM
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  • Application Information

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Problems solved by technology

Although the entire patent describes that the engine, electric motor and mechanical brake system respond individually

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  • Torque adjusting method of electric automobile adaptive cruise system
  • Torque adjusting method of electric automobile adaptive cruise system
  • Torque adjusting method of electric automobile adaptive cruise system

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, so as to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0029] The torque adjustment method for the adaptive cruise system of an electric vehicle provided by the present invention adopts a preset relationship curve, so it is a key step to construct the relationship curve between the rolling resistance coefficient and the road surface and tire pressure based on the parameters collected in the actual driving experiment. Its specific implementation method: on a straight coated road surface, the pressure of the automobile tire is changed from P min (kPa) to P max (kPa), use the interval of 10kPa to fix the tire pressure value of the car, and record the rolling resistance coefficient corresponding to the vehicle at a stable speed. For each group of tire pressure, the experiment was repeated 5 times to...

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Abstract

The invention provides a torque adjusting method of an electric automobile adaptive cruise system, and relates to the field of automobiles. The method includes the steps: calculating desired acceleration speed Vdes (n) by the aid of an adaptive cruise controller; detecting automobile tire pressure Ptir by the aid of a tire pressure sensor; detecting a road gradient Phi by the aid of a tilt angle sensor; detecting weight M of an integrated automobile by the aid of a pressure sensor; detecting actual speed v(n) of a vehicle by a vehicle speed sensor; detecting actual acceleration speed Vact (n)of the vehicle by an acceleration speed sensor; inputting driving environment information by a man-machine interactive system; acquiring a rolling resistance coefficient according to relation functions among the rolling resistance coefficient, a road and tire pressure; implementing front feed adjustment of a standard torque Tfid(n) through a dynamical model; performing correction through adaptivePID feedback to obtain a desired torque Tdes (n); switching maintaining areas to achieve effective switching of driving control and braking control; implementing adaptive cruise control. According tothe method, adjusting time from stabilization to final target acceleration speed is shortened, and stability of the system is improved.

Description

technical field [0001] The patent belongs to the technical field of automobiles, and in particular relates to a torque adjustment method for an adaptive cruise system of an electric vehicle. Background technique [0002] In order to achieve green travel and renewable energy utilization, new energy vehicles have emerged all over the world and are favored by people. The birth and development of Internet + and artificial intelligence technology has made human beings pursue a more efficient, convenient and comfortable life. These technologies are brought together to form an electric vehicle with intelligent assisted driving functions, and further evolved into a smart electric vehicle. The adaptive cruise control system is a sub-function of the intelligent assisted driving system. During the driving process of the vehicle, by detecting the current traffic environment state and the vehicle running state, the driving motor and the braking system are cooperatively controlled to mak...

Claims

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Application Information

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IPC IPC(8): B60L15/20B60W30/14B60W10/08B60W10/18B60W40/06
CPCB60W10/08B60W10/18B60W30/14B60W40/06B60L15/20B60L2240/423B60W2520/10B60W2520/105B60W2530/20B60W2530/10B60W2552/15Y02T90/16
Inventor 朴昌浩黄魏禄盛沈海寅
Owner CHONGQING UNIV OF POSTS & TELECOMM
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