| 摘要 |
An integral engine fueling and engine compression braking hydraulically actuated, electronically controlled unit injector (HEUI) system comprises a fuel injection piston. A brake rocker arm extends transversely through the fuel injector and axially accommodates the fuel injector plunger and plunger return spring. The brake rocker arm is also operatively connected to the engine exhaust valve rocker arm, and a camming shaft, having a flat or planar surface portion, is operatively connected to an end portion of the brake rocker arm. When the end portion of the brake rocker arm is disposed in contact with the flat or planar surface portion of the camming shaft, normal fuel injection can occur in accordance with an electronic control module (ECM). When the electronic control module (ECM) actuates a servomechanism for rotating the camming shaft such that the end portion of the brake rocker arm is disposed in contact with a curved portion of the camming shaft, a brake actuation sleeve, mounted upon the brake rocker arm, engages the fuel injection piston such that upon actuation of the fuel injection piston, the brake rocker arm causes the exhaust valve rocker arm to actuate the exhaust valve so as to achieve engine compression braking.
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