초록 ▼

An exhaust brake system for internal combustion engines includes an exhaust valve within the exhaust duct which is closed or opened for the braking of a vehicle during engine operation by means of an engine brake valve. A magnetic valve is arranged within the control duct and is controlled by an ele

An exhaust brake system for internal combustion engines includes an exhaust valve within the exhaust duct which is closed or opened for the braking of a vehicle during engine operation by means of an engine brake valve. A magnetic valve is arranged within the control duct and is controlled by an electrical circuit connected to a terminal of the ignition switch and to the positive terminal of the generator in such a manner that the exhaust valves are closed during the starting of the engine and when the engine is idling. The formation of white exhaust smoke during cold starting of the engine and the formation of blue exhaust smoke during idling of the engine is decreased.

대표청구항 ▼

1. Control arrangement for an exhaust brake of an internal combustion engine, comprising: an exhaust valve located in an engine exhaust duct; air-pressure actuated control means for operably moving the exhaust valve to open and closed positions; first means for selectively connecting said air p

1. Control arrangement for an exhaust brake of an internal combustion engine, comprising: an exhaust valve located in an engine exhaust duct; air-pressure actuated control means for operably moving the exhaust valve to open and closed positions; first means for selectively connecting said air pressure actuated control means to a source of pressurized air, said first connecting means including a manually operated control element; second means for selectively connecting said air pressure actuated control means to a source of pressurized air, said connecting means including an electrically operated control element; and circuit means for controlling the operation of said electrically operated control element in response to engine operating conditions. 2. Control arrangement according to claim 1, wherein said electrically operated control element is a three-port, two position magnetic valve. 3. Control arrangement according to claim 2, wherein said first connecting means comprises a first common duct extending from the source of pressurized air and connecting to a ring duct, a first branch of the ring duct extending from the connecting point of the common duct to a first inlet port of a two-way valve, and a second common duct extending from an outlet port of the two-way valve to said air pressure actuated control means; and wherein said second connecting means comprises said first common duct, a second branch of the ring duct extending from the connecting point of the common duct to a second inlet port of the two-way valve, and said second common duct; and wherein said manually operated control element is arranged in said first branch of the ring duct and said two-position magnetic valve is arranged in said second branch of the ring duct. 4. Control arrangement according to claim 3, wherein said first common duct is connected to an outlet port of a distribution valve, said distribution valve having an inlet port connected to means for producing pressurized air. 5. Control arrangement according to claim 3, wherein said manually operated control element is arranged in said first branch of the ring duct and said electrically operated control element is arranged in said second branch of the ring duct. 6. Control arrangement according to claim 5, wherein said first common duct is connected to an outlet port of a distribution valve, said distribution valve having an inlet port connected to means for producing pressurized air. 7. Control arrangement according to claim 2, wherein said electrically operated control element is operated, and said exhaust valve is thereby closed, during engine idling operations when engine coolant temperatures are above a second predetermined temperature value. 8. Control arrangement according to claim 1, wherein said first connecting means further includes a distribution valve having an inlet port connected to a source of pressurized air and an outlet port connected to the manually operated control element, and wherein said second connecting means further includes a relief valve having an inlet port connected to the source of pressurized air at a point upstream of the inlet port of the distibution valve, and said relief valve having an outlet port connected to the electrically operated control element. 9. Control arrangement according to claim 1, wherein said circuit means is connected to a battery by an ignition switch. 10. Control arrangement according to claim 1, wherein said electrically operated control element includes an electric actuator having a first terminal connected to a current supply portion of said circuit means and having a second terminal connected to a current return portion of said circuit means, and wherein said second terminal is connected to a positive terminal of a generator driven by the engine. 11. Control arrangement according to claim 10, wherein said current supply portion includes a thermostatic switch responsive to the operating temperature of the engine, and a brake switch responsive to the operating position of a hand-operated brake. 12. Control arrangement according to claim 11, wherein the thermostatic switch is closed when engine coolant temperatures are below a first predetermined coolant temperature, open when engine coolant temperatures are above said first pre-determined temperature but below a second predetermined temperature, and closed when said coolant temperatures are above said second predetermined temperature. 13. Control arrangement according to claim 10, wherein said second terminal is connected to the generator terminal by diode means. 14. Control arrangement according to claim 10, wherein said second terminal is further connected to switching means, responsive to an operating position of the vehicle gas pedal, for connecting said second terminal to the current return portion of the circuit means. 15. Control arrangement according to claim 1 further comprising pressure sensing means arranged in the engine exhaust duct upstream of said exhaust valve. 16. Control arrangement according to claim 15, wherein said pressure sensing means is connected to the electrically operated control element by control means for operating said element in response to a predetermined pressure build-up in the exhaust duct. 17. Control arrangement according to claim 1, wherein said electrically operated control element is operated, and said exhaust valve is thereby closed, during engine starting when engine coolant temperatures are below a first predetermined temperature value. 18. Control arrangement according to claim 1, wherein said electrically operated control element is operated, and said exhaust valve is thereby closed, during engine idling operations when engine coolant temperatures are below a first predetermined temperature value.