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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >The Safety and Dynamic Performance of Blended Brake System on a Two-Speed DCT Based Battery Electric Vehicle
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The Safety and Dynamic Performance of Blended Brake System on a Two-Speed DCT Based Battery Electric Vehicle

机译：基于DCT的两速电池电动汽车混合制动系统的安全性和动态性能

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Regenerative braking has been widely accepted as a feasible option to extend the mileage of electric vehicles (EVs) by recapturing the vehicle's kinetic energy instead of dissipating it as heat during braking. The regenerative braking force provided by a generator is applied to the wheels in an entirely different manner compared to the traditional hydraulic-friction brake system. Drag torque and efficiency loss may be generated by transmitting the braking force from the motor, axles, differential and, specifically in this paper, a two-speed dual clutch transmission (DCT) to wheels. Additionally, motors in most battery EVs (BEVs) and hybrid electric vehicle (HEVs) are only connected to front or rear axle. Consequently, conventional hydraulic brake system is still necessary, but dynamic and supplement to motor brake, to meet particular brake requirement and keep vehicle stable and steerable during braking. Therefore, a complicated effect on the safety and performance of braking, mainly relating to tyre slips and locks, vehicle body bounces and braking distance will be applied by the blended brake system. In this paper, the brake energy recovery potentials of typical driving cycles are presented. Relevant critical limitations are introduced to define the available brake force distribution range for front and rear axles. Then the distribution strategies are compared and analyzed to achieve a satisfied balance between braking performance, driving comfort and energy recovery rate. Next, the required motor brake force is tuned, according to the response time and efficiency loss in transfer process which obtained in testing bench. At last, solutions for some special cases are proposed, for instance, motor brake torque interruption when downshifting occurs on long downhill. A credible conclusion is gained, through experimental validation of optimized brake force distribution strategy on a two-speed DCT based BEV testing rig, that the selected force distribution strategy help the blended brake system achieve a comfortable and safety braking during all driving conditions.
机译：再生制动已被广泛接受，作为一种可行的选择，它可以通过重新获得车辆的动能而不是在制动过程中将其散发的热量来延长电动汽车的行驶里程。与传统的液压摩擦制动系统相比，发电机提供的再生制动力以完全不同的方式作用于车轮。阻力转矩和效率损失可能是通过将制动力从电动机，车桥，差速器，尤其是本文中的两速双离合器变速器（DCT）传递到车轮而产生的。此外，大多数电池电动汽车（BEV）和混合动力汽车（HEV）中的电动机仅连接到前轴或后轴。因此，仍然需要常规的液压制动系统，但是该系统是动态的并且是电动机制动的补充，以满足特定的制动要求并在制动过程中保持车辆的稳定和可操纵性。因此，混合制动系统将对制动的安全性和性能产生复杂的影响，主要涉及轮胎打滑和锁死，车身弹跳和制动距离。本文介绍了典型行驶周期的制动能量回收潜力。引入了相关的关键限制，以定义前桥和后桥的可用制动力分配范围。然后对分配策略进行比较和分析，以在制动性能，驾驶舒适性和能量回收率之间取得令人满意的平衡。接下来，根据在测试台上获得的响应时间和传递过程中的效率损失来调整所需的电动机制动力。最后，提出了一些特殊情况的解决方案，例如，在长时间下坡时降档时电机制动转矩中断。通过在基于双速DCT的BEV测试台上对优化的制动力分配策略进行实验验证，得出了可靠的结论，即所选的力分配策略可帮助混合制动系统在所有行驶条件下实现舒适安全的制动。

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