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原文传递 Test Track Evaluation of Light Vehicle Brake Assist.

题名：	Test Track Evaluation of Light Vehicle Brake Assist.
作者：	Forkenbrock-G.J.; Snyder-A.; Jones-R.E.
关键词：	Brakes-; Stopping-distance.;Advanced-technology; Safety-.
摘要：	The objectives of the work described in this report were twofold: (1) to objectively identify the BA activation thresholds of five contemporary test vehicles, and (2) to evaluate braking performance of the test vehicles using BA activation threshold-based brake applications. The studys second objective was broken down into two parts. First, the braking performance of the vehicles with BA enabled was compared to that achieved with the system disabled. For these tests, only brake applications believed to be representative of the vehicles BA activation thresholds were used. Next, the braking performance achieved via use of threshold-based brake applications was compared to the maximum braking capability of the vehicle. Three braking maneuvers were used in this study: two straight line stops (initiated from 45 and 65 mph), and a brake in-a-turn maneuver initiated from 45 mph. For each test, a programmable brake controller was used to insure the maneuvers were executed as accurately and repeatably as possible. To evaluate whether the manner in which the brakes were applied influenced the BA activation threshold, two brake controller feedback loops were used. When displacement feedback was utilized, the brake controller used a control feedback loop capable of modulating brake pedal force to maintain constant pedal position. Similarly, when force feedback was used, the brake controller used a control feedback loop capable of modulating brake pedal position to maintain constant application of force. Generally speaking, use of displacement feedback-based application thresholds allowed the effect of BA to be successfully evaluated, and demonstrated the technology is capable of producing substantial reductions in stopping distance for some vehicles provided the right combination of brake pedal displacement and high application rate are applied. For four of the five vehicles evaluated in this study, use of threshold-based applications with BA enabled were able to achieve mean stopping distances within approximately 16 ft of the vehicles maximum braking capability. The brake controllers force feedback-based applications were generally unable to distinguish the stopping performance realized with BA enabled from that achieved with the systems disabled. Therefore, the authors believe this feedback strategy is unsuitable for evaluating BA performance. The use of displacement feedback control logic is recommended.
报告类型：	科技报告