Composition of the evaluation system
1) Evaluators who make subjective evaluations of brake pedal feel
It is composed of professionals who have received relevant training or experienced experts. The evaluator who conducts the subjective evaluation of the brake pedal feeling should first have relatively high professional knowledge of the automobile braking system, be able to have a relatively familiar understanding of the automobile braking system, and be able to judge the performance of the braking system at a professional level; secondly, Brake pedal feel evaluators should have good resolution and memory, and be able to clearly and accurately express the evaluated items; moreover, when evaluating the vehicle brake pedal feel, the evaluators should ensure that they can be relatively objective To avoid misjudgment of the actual state of vehicle brake pedal feeling caused by self-factors; thirdly, evaluators should have at least one year of skilled driving experience and be able to deal with various emergencies during the evaluation process. For the entire subjective evaluation process of the brake pedal feeling, it is generally carried out in the form of an "evaluation group". The members of the evaluation group belong to the component design and development department, the vehicle system integration department and the test department. The personnel in the department should try their best to express the different evaluation feelings of different personnel.
2) Conditions for subjective evaluation of brake pedal feel
Including the selection of evaluation sites and the control and setting of vehicles and environmental conditions. The safety of the evaluators is the first priority, so it is necessary to consider whether the state of the vehicle and its related settings meet the design requirements. Moreover, for the subjective evaluation of the brake pedal feel itself, each evaluation item has a corresponding test road, test method, and requirements including weather, temperature, etc., so the test should try to meet the test requirements when conducting the test. The evaluation environment should be controlled within the permitted range as much as possible. During the test process, for the same evaluation item, it can be carried out at different vehicle speeds or different road conditions, and a comprehensive investigation can finally be realized.
3) Rules and content of subjective evaluation of brake pedal feel
Including subjective evaluation rules and scoring methods. During the evaluation process, the evaluators should conduct tests according to the provided brake pedal feeling evaluation indicators and scoring methods. The evaluation indicators usually have a certain pertinence and purpose, and the evaluators should strictly follow the evaluation indicators and scoring methods for evaluation. At present, the commonly used scoring methods mainly include qualitative evaluation and quantitative evaluation, etc.: qualitative evaluation is a method for evaluating a variety of vehicles (vehicles) by relative ranking, and one of the quantitative evaluation methods is the relative score method, that is, the reference sample vehicle is used as the Standards, other test vehicles are scored relative to the reference sample vehicle, and the other is the absolute score method, which expresses the evaluation of the test vehicle in a quantitative way. These different evaluation methods put forward different requirements for the evaluators.
4) Expression of evaluation conclusion
Generally, the conclusion of subjective evaluation generally adopts the form of spider chart (radar chart). Spider diagrams have the advantage of clearly and visually describing the overall results. However, the subjective evaluation of brake pedal feeling involves not only the quality of a certain index, but also the subjective feeling brought by this index, which is the basis for the design engineer to improve the brake pedal feel based on the information of the evaluators.
Scoring Method for Subjective Evaluation of Brake Pedal Feel
Subjective evaluation item indicators of brake pedal feel (professional evaluators)
Subjective evaluation item indicators of brake pedal feel (non-professional evaluators)
