Abstr: It is important to study the torque curve, for it reflects the make-up state of premium connection with torque shoulder.

文章摘要：扭矩曲线是带扭矩台肩的特殊螺纹接头上扣状态的反映，这一曲线研究对特殊螺纹接头正确使用非常重要。

A simulation testbed for the engine brake when the vehicle coasts on lasting downhill was built, and the engine brake torque curve was obtained by the test on the testbed .

建立了汽车下长坡时发动机制动模拟实验台，通过试验获得了发动机的制动力矩曲线。