| 摘要 |
<p>A valve control system for controlling intake (7) and exhaust (2) valves of an internal combustion engine (1) is associated with an exhaust brake (4). Electromagnetic actuator means (5) operates the intake and exhaust valves. When the exhaust brake (4) is applied, the electromagnetic actuator means is operated to increase the force to close the exhaust valve of the cylinder in the intake stroke. With the exhaust valve thus securely closed, the back pressure of exhaust gases on the engine can be increased thereby to increase the power of the engine braking being applied by the exhaust brake.</p> |
