Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Patent
1996-08-02
1998-03-24
Dolinar, Andrew M.
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
F01L 904, F01L 1306
Patent
active
057301026
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In exhaust gas turbocharger engines used in commercial vehicles, the increasing level of charge decreases the braking performance related to useful effect. Contemporary systems often can no longer meet the legal requirements. Auxiliary systems, such as retarder brakes, are extremely costly. The braking performance made possible by the use of an exhaust gate is limited.
SUMMARY OF THE INVENTION
To further increase the engine braking performance, an engine braking device for an internal combustion engine, particularly for a diesel engine, is provided in accordance with the invention, the device having an actuatable blocking element in the exhaust gas line and an actuating means that respectively acts on at least one discharge valve of a cylinder and is in operational connection with an electromagnetically-operating setting device.
The provision of this device makes it possible to actuate the discharge valve at least once during the compression phase of the engine, in addition to the usual opening times of the discharge valve, in order to additionally influence the exhaust gate. This additional opening is effected at least shortly before the end of the compression phase, so the compressed cylinder contents are pushed out into the exhaust gas line blocked by the exhaust gate and, after the exhaust valve closes and the upper dead center is exceeded, are no longer available for retroactively affecting the piston. In addition, the discharge valve can be opened briefly, by way of the electromagnetic setting device, at the start of the compression stroke, so that the gas blocked in the exhaust gas line by the exhaust gate flows into the cylinder due to the overpressure, necessitating additional compression work that has a braking effect on the vehicle. The particular advantage of the engine braking device of the invention in comparison to conventional mechanically, hydraulically or pneumatically actuated braking devices of this type is that "individual actuation" is possible with the use of a corresponding control device. Thus, it is possible, for example, to create a stepped braking effect by way of this exhaust gas brake in that not all cylinders are affected when the braking process is initiated; only one or a few of the cylinders is or are initially actuated. An opening and closing of the discharge valves that is optimal with respect to the braking moment can be effected with this type of actuation, preferably electronic actuation, of the individual electromagnetically-operating setting units as a function of rpm during the compression stroke in braking operation.
A further advantage of the engine braking device of the invention lies in the reduction of components compared to conventional braking systems; as a result, the electromagnetically-operating setting device can be disposed in the cylinder head of the engine, for example laterally next to or above the valves.
In an advantageous embodiment of the invention, it is provided that the electromagnetic setting device is formed by a setting block in which an armature is guided which is in operational connection with the actuating means, the armature also being connected to two spring elements acting counter to one another, the armature further being allocated at least one magnetic coil as an opening element and at least one magnetic coil as a closing element. To activate the setting unit, the armature is brought into the closing position by the closing magnet. The setting unit is subsequently brought into engagement with the aid of the magnetic coil, by way of the valve lifter, or the lower spring is prestressed with the aid of the additional coil and the prestressing armature. To open the valve, the prestressing magnet is shut off, so that the armature moves to the oppositely-located opening magnet and is taken over by this magnet. The impact speed of the armature against the opening magnet is determined by the other spring and by the characteristic of the current path of the opening magnet, by means of which the armature is hel
REFERENCES:
patent: 3710908 (1973-01-01), Muir
patent: 4762095 (1988-08-01), Mezger et al.
patent: 5131624 (1992-07-01), Kreuter et al.
patent: 5255650 (1993-10-01), Faletti et al.
Patent Abstracts of Japan, vol. 14, No. 357 (M-1005), Aug. 2, 1990, for JP 2-125905 (Kawasaki) May 14, 1990.
Arnold Manfred
Ecker Hermann-Josef
Schebitz Michael
Dolinar Andrew M.
FEV Motorentechnik GmbH & Co. Kommanditgesellschaft
LandOfFree
Engine brake device for a commercial vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Engine brake device for a commercial vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine brake device for a commercial vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2281867