Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1989-09-28
1991-08-06
Kamen, Noah P.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
123378, F02B 7700
Patent
active
050368087
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a diesel internal combustion engine, particularly for vehicles and comprising an air intake pipe for supplying air of combustion to combustion cylinders and a throttle valve located in the air intake pipe and pivotable therein for controlling a flow cross-section.
In such diesel internal combustion engines for vehicles, a dangerous operating state can occur if more combustible fuel-air mixture is supplied than was selected by the driver per actuation of the accelerator pedal due to disturbances in the combustion cylinders. Damages to the internal combustion engine can occur by exceeding the allowable maximum speed, or accidents can occur because it is not possible to "ease up on the gas" ("automatic acceleration").
It is already known for diesel engines with fuel injection pumps to stop the fuel supply to the fuel injection pump in such cases by an emergency stopping device, so that the engine stops after the pump interior space is sucked empty by the fuel injection pump (DE-OS 30 04 335). In fuel injection pumps with a large pump interior, the reaction time, i.e. the time between the occurrence of disturbance until the stopping of the engine, is relatively long. The emptying of the pump interior can be accelerated and the reaction time of the emergency stopping device can accordingly be shortened by additional measures.
SUMMARY OF THE INVENTION
The object of the present invention is a diesel internal combustion engine that does not turn off when an excessive unwanted amount of fuel is supplied, rather only the speed is limited. The object of the invention is achieved by providing a drive for pivoting the throttle valve and a control mechanism for controlling operation of the drive in accordance with existing operational conditions. The safety device required for this purpose is very simple with respect to construction and can be realized with simple means. In addition, its functioning can be checked continuously or from time to time during the operation of the engine, specifically in an idle state so a higher degree of safety is provided. The safety device, according to the invention, is characterized by an extremely short reaction time.
According to an advantageous embodiment of the invention, the drive comprises a drive spring acting in the closing direction of the throttle valve, and an electric, pneumatic or hydraulic motor acting in the opening direction of the throttle valve. Thereby a safe operating state of the internal combustion engine is always achieved without auxiliary energy. A defect in the safety device allows the safe operating state of the internal combustion engine to occur automatically.
The functioning of the safety device can be checked without impeding the driving operation and so as to be unnoticed by the driver by a monitoring device provided according to another embodiment of the invention which, when switched on, sends a closing signal for the valve drive, i.e. a turn-off signal for the motor in the construction of the valve drive as indicated above, when absolute idling conditions, such as idling speed of the internal combustion engine, idling position of the accelerator, idling fuel injection quantity supplied to the combustion cylinders, prevail when the internal combustion engine is at operating temperature. In the event that the throttle valve does not occupy its preselected closing position under idling conditions and transmission of the closing signal for the throttle valve drive, a warning light is switched on which reports a failure of the safety device to the driver and induces him to search for a workshop. It is sufficient if the function testing of the safety device is carried out by the monitoring unit once every time the internal combustion engine is restarted when the internal combustion engine is at an operating temperature. A continuous checking in every idling phase of the internal combustion engine is also possible.
The sensor required for the monitoring device for detecting the closing position of t
REFERENCES:
patent: 4375748 (1983-03-01), Yamane
patent: 4393833 (1983-07-01), Mann et al.
patent: 4401078 (1983-08-01), Kato et al.
patent: 4426972 (1984-01-01), Kimura et al.
Kamen Noah P.
Robert & Bosch GmbH
Striker Michael J.
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