A vehicle adaptive cruise control system

Abstract

The invention relates to a vehicle adaptive cruise control system. The vehicle adaptive cruise control system is characterized in that an information collecting unit, a lane changing early warning unit, an adaptive cruise control unit and a vehicle dynamics unit are included; the information collecting unit collects and processes the driving state information of a vehicle, and sends the driving state information to the lane changing early warning unit and the adaptive cruise control unit; the lane changing early warning unit calculates the lane changing minimum safety distance between the own vehicle and surrounding vehicles according to the received effective vehicle movement information, and judges lane changing risks according to a calculation result, an early warning is carried out on the vehicle according to a judgment result, and the judgment result is sent to the vehicle adaptive cruise control unit; the vehicle adaptive cruise control unit selects a control mode according to the vehicle movement information and the lane changing risk judgment result, calculates expected longitudinal acceleration needed by vehicle longitudinal driving, and sends the calculated expected longitudinal acceleration to the vehicle dynamics unit; the vehicle dynamics unit converts the expected longitudinal acceleration into an expected air valve opening degree or braking pressure and sends the expected air valve opening degree or the braking pressure to a vehicle object, and the longitudinal control over the vehicle object is completed.

Description

technical field [0001] The invention relates to the field of vehicle longitudinal driving safety, in particular to a vehicle adaptive cruise control system with a lane-changing auxiliary function. Background technique [0002] As one of the typical representatives of driver assistance systems (DAS, Driver Assistance Systems), adaptive cruise control system (ACC, Adaptive Cruise Control System) can improve driving safety, improve traffic congestion and relieve driving fatigue, and has been recognized by research institutions and automobile companies wide recognition and attention. So far, the development of the ACC system has been relatively mature. However, the existing ACC system still has certain limitations in the dangerous condition of changing lanes: when the driver generates a lane-changing intention, the existing ACC system fails to change the lane. Feasibility analysis; and also failed to timely adjust the conversion of the following target, thus hindering the drive...

AI Technical Summary

Problems solved by technology

So far, the development of the ACC system has been relatively mature. However, the existing ACC system still has certain limitations in the dangerous condition of changing lanes: when the driver generates a lane-changing intention, the existing ACC system fails to change the lane. Feasibility analysis; and also failed to timely adjust the conversion of the following target, thus hindering the driver's lane change behavior; in addition, the lane change limitations of the existing ACC system increase the frequency of manual intervention by the driver on the system, Affect driving comfort

[0003] The existing ACC system intends to provide longitudinal assistance to the driver's lane-changing behavior. In terms of lane-changing safety, it is necessary to make a comprehensive judgment on the feasibility of lane-changing. However, the existing lane-changing warning system mainly focuses on the vehicle behind the target lane, and does not consider The relative motion relationship with other surrounding vehicles cannot evaluate the comprehensive risk of lane changing

In addition, in terms of lane change control, it is necessary to solve the following three aspects: the tracking performance between the self-vehicle and the two preceding vehicles, the safety between the self-vehicle and multiple vehicles in the surrounding environment, and the longitudinal comfort of the driver. The multi-objective coordination optimization problem of , there is no good solution to this problem

Although it is also proposed to add automatic lane changing function to the existing ACC system, there are two problems: first, the ACC system only controls the longitudinal movement of the vehicle, while the automatic control system also needs to control the steering wheel angle, the two are executing Differences in the control of the driver can easily disturb the driver's sense of control; second, the automatic lane change system only controls a single vehicle to complete the lane change behavior, ignoring the movement coordination relationship between the own vehicle and the surrounding vehicles during the lane change process, making it difficult to guarantee safety

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