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An exhaust braking system used with an internal combustion engine has an inlet valve an exhaust valve, an exhaust brake connected in an exhaust system connected with the exhaust valve, and an actuator connected in a fluid circuit with the exhaust brake. The exhaust brake is closed to retard the rota

An exhaust braking system used with an internal combustion engine has an inlet valve an exhaust valve, an exhaust brake connected in an exhaust system connected with the exhaust valve, and an actuator connected in a fluid circuit with the exhaust brake. The exhaust brake is closed to retard the rotational speed of the engine and an induction valve connected in an induction passage to the inlet valve and in the fluid circuit with the exhaust brake is also operated to facilitate engine speed retardation. Timing apparatus is connected with the induction valve and exhaust brake to ensure the exhaust brake is closed no later than the closing of the induction valve, while a non-return valve is connected in the induction passage to facilitating an increase in pressure within a piston cylinder of the engine and hence increase the engine retardation. A pressure sensitive device connected in the induction passage or exhaust system controls the maximum pressure of the braking system. Preferably, the pressure sensitive means is a pressure release valve. The method of operating the exhaust braking system is also disclosed.

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1. An exhaust braking system for an internal engine having an inlet valve and an exhaust valve, the system comprising an induction valve arranged to be connected in an induction passage to the inlet valve, an exhaust brake arranged to be connected in an exhaust system connected with an exhaust valve

1. An exhaust braking system for an internal engine having an inlet valve and an exhaust valve, the system comprising an induction valve arranged to be connected in an induction passage to the inlet valve, an exhaust brake arranged to be connected in an exhaust system connected with an exhaust valve, actuator means connected in a fluid circuit with the induction valve and exhaust brake for operating the induction valve and exhaust brake to close the induction passage and exhaust system when the rotational speed of the engine is to be retarded, timing means connected with the induction valve and exhaust brake for ensuring the exhaust brake is closed no later than the closing of the induction valve, a non-return valve arranged to be connected in the induction passage between the induction valve and inlet valve for facilitating an increase in presssure within a piston cylinder of the engine to increase the engine retardation, and pressure sensitive means arranged to be connected in the induction passage for controlling maximum pressure of the braking system. 2. An exhaust braking system for an internal combustion engine having an inlet valve and an exhaust valve, the system comprising an induction valve arranged to be connected in an induction passage to the inlet valve, an exhaust brake arranged to be connected in an exhaust system connected with an exhaust valve, actuator means connected in a fluid circuit with the induction valve and exhaust brake for operating the induction valve and exhaust brake to close the induction passage and exhaust system when the rotational speed of the engine is to be retarded, timining means connected with the induction valve and exhaust brake for ensuring the exhaust brake is closed no later than the closing of the induction valve, a non-return valve arranged to be connected in the induction passage between the induction valve and inlet valve for facilitating an increase in pressure within a piston cylinder of the engine to increase the engine retardation, and pressure sensitive means arranged to be connected in the exhaust system for controlling maximum pressure of the braking system. 3. A system according to claim 1, wherein the pressure sensitive means is a pressure release valve. 4. A system according to claim 1, wherein the pressure sensitive means is an electrically operable pressure release valve. 5. A system according to claim 4, wherein the pressure sensitive means is operative to release pressure within the induction or exhaust system by controlling the opening of the induction valve or exhaust brake. 6. A system according to claim 5 wherein the operable pressure of the pressure sensitive means is adjustable. 7. A system according to claim 5 wherein the pressure release valve is a fixed pressure type. 8. A system according to claim 1, wherein the timing means comprises a pair of tubes of differing internal diameter, the tube of larger internal diameter has one end thereof connectable to the exhaust brake, and the tube with smaller internal diameter having one end thereof connectable to the induction valve, the opposing ends of the tubes being connected to the actuator means. 9. A system according to claim 1, wherein the actuator means comprises a mannually operable foot valve which is conveniently connected with the brake pedal of a commercial road vehicle. 10. A system according to claim 1, wherein the actuator means comprises an electrically operable valve controllable with an electric switch. 11. A method of operating an exhaust brake system for an internal combustion engine having an inlet valve and exhaust valve, the method comprising actuating an induction valve arranged to be connected in an induction passage to the inlet valve, actuating an exhaust brake arranged to be connected in an exhaust system connected with the exhaust valve, operating actuating means connected in a fluid circuit with the induction valve and exhaust brake to initiate actuation of the induction valve and exhaust brake through the intermediary of timing means connected with the induction valve and exhaust brake for ensuring the exhaust brake is closed no later than the closing of the induction valve to close the induction passage and exhaust system when the rotational speed of the engine is to be retarded, introducing the air into the induction passage through a non-return valve connected in the passage between the induction valve and inlet valve to facilitate increase in pressure within the piston cylinder of the engine to increase engine retardation, and controlling the maximum pressure of the braking system by venting the system through pressure sensitive means arranged to be connected in the induction passage. 12. A method of operating an exhaust brake system for an internal combustion engine having an inlet valve and exhaust valve, the method comprising actuating an induction valve arranged to be connected in an induction passage to the inlet valve, actuating an exhaust brake arranged to be connected in an exhaust system connected with the exhaust valve, operating actuating means connected in a fluid circuit with the induction valve and exhaust brake to initiate actuation of the induction valve and exhaust brake through the intermediary of timing means connected with the induction valve and exhaust brake for ensuring the exhaust brake is closed no later than the closing of the induction valve to close the induction passage and exhaust system when the rotational speed of the engine is to be retarded, introducing the air into the induction passage through a non-return valve connected in the passage between the induction valve and inlet valve to facilitate increase in pressure within the piston cylinder of the engine to increase engine retardation, and controlling the maximum pressure of the braking system by venting the system through pressure sensitive means arranged to be connected in the exhaust system.