Vehicle emergency braking pre-pressure-buildup method and related equipment

Abstract

The invention discloses a vehicle emergency braking pre-pressure-buildup method and related equipment. The vehicle emergency braking pre-pressure-buildup method comprises the steps of building a pre-pressure-buildup range; monitoring the target vehicle entering the pre-built pressure range to obtain position information of the target vehicle; acquiring own vehicle information and road condition information; obtaining pre-pressure-buildup time of the target vehicle according to the position information of the target vehicle and the vehicle information; calculating pre-built pressure advance time according to the vehicle information and the road condition information; calculating to obtain a preset pre-built pressure compensation time threshold value according to the pre-built pressure advance time; comparing the pre-pressure-buildup time with a preset pre-pressure-buildup compensation time threshold value, and judging whether the target vehicle is a dangerous target or not; and if the target vehicle is a dangerous target, sending a pre-pressure-buildup instruction. By establishing the pre-pressure-buildup range and adopting the boundary confirmation method to detect the target vehicle entering the pre-pressure-buildup range in time, the processing time of emergency situations is prolonged, self-vehicle information and road condition information are monitored in real time, and the pre-pressure-buildup process is more accurate.

Description

technical field [0001] The invention relates to the technical field of vehicle emergency braking, in particular to a vehicle emergency braking pre-build pressure method and related equipment. Background technique [0002] The L2-level auxiliary emergency braking system analyzes the perception signal. When the detected target is in danger of collision, the ADAS controller of the advanced driving assistance system sends a deceleration command to the ESC actuator of the body electronic stability control system, and the ESC receives the deceleration. Braking action is performed after the command is requested, and the maximum deceleration can reach about 0.9g. But in fact, the braking ability will be affected by factors such as actuator response time, tire performance and road conditions, and cannot provide the required braking force in time. Therefore, it is necessary to pre-build pressure on the ESC actuator, and appropriately advance the ESC response time according to the act...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, if the target suddenly appears or cuts into the front of the vehicle and becomes a dangerous target, and the ADAS system has met the TTC<T requirement, the system will directly send a deceleration and braking request, resulting in the failure to complete the pre-build pressure operation in this scene. ESC system response will be delayed, increasing the risk of collision

Moreover, in rainy and snowy days or when the tires of the own vehicle are seriously worn, the friction between the vehicle and the road is small, and the vehicle cannot achieve the maximum deceleration. At this time, the required braking distance increases. The pre-built pressure cannot guarantee that the vehicle will stop in time during the pressure build compensation time

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