Apparatus for driving electromagnetic devices, particularly electromagnetic injection valves in internal combustion engines
First Claim
1. In an apparatus for driving an electromagnetic device, such as the electromagnetic fuel injection valves of an internal combustion engine, having an injection pulse generator for generating a train of actuating pulses, as a function of engine operating parameters, for actuating the electromagnetic device, the improvement comprising:
- a magnetization period control circuit arrangement connected to the injection pulse generator; and
switch means connected to the magnetization period control circuit arrangement and the electromagnetic device, wherein the magnetization period control circuit arrangement and the switch means provide for closure of the electromagnetic device for a portion of the period between successive pulses in the train of actuating pulses and a controlled advanced magnetization of the electromagnetic device for a different portion of the period between successive pulses in the train of actuating pulses, said magnetization period control circuit arrangement comprising;
at least one timing element means connected to the switch means and to the injection pulse generator for actuation by the train of actuating pulses; and
control means connected to said at least one timing element means for controlling the actuation time of said at least one timing element means and consequently the onset of the advanced magnetization.
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus is proposed for driving electromagnetic devices, in particular electromagnetic injection valves in internal combustion engines. The apparatus includes a signal source for actuating pulses and is characterized in that at least one timing circuit is provided for advanced magnetization, preferably dependent on operating characteristics, of the electromagnetic device. The apparatus achieves the most linear possible relationship between the duration of the actuating pulse and, for example, the opening time of the injection valve. In this manner, the fuel quantity to be supplied to the internal combustion engine can be more precisely dosed and the operational behavior of the engine can be made optimal. Because of the advanced magnetization, the electromagnetic injection valve, for example, attracts more rapidly at the onset of the actuating pulse, because the magnetic coil has already stored a certain amount of energy, which lies somewhat below that amount which is required for attraction on the part of the magnetic core and thus for the ejection of fuel.
17 Citations
8 Claims
-
1. In an apparatus for driving an electromagnetic device, such as the electromagnetic fuel injection valves of an internal combustion engine, having an injection pulse generator for generating a train of actuating pulses, as a function of engine operating parameters, for actuating the electromagnetic device, the improvement comprising:
-
a magnetization period control circuit arrangement connected to the injection pulse generator; and
switch means connected to the magnetization period control circuit arrangement and the electromagnetic device, wherein the magnetization period control circuit arrangement and the switch means provide for closure of the electromagnetic device for a portion of the period between successive pulses in the train of actuating pulses and a controlled advanced magnetization of the electromagnetic device for a different portion of the period between successive pulses in the train of actuating pulses, said magnetization period control circuit arrangement comprising;at least one timing element means connected to the switch means and to the injection pulse generator for actuation by the train of actuating pulses; and control means connected to said at least one timing element means for controlling the actuation time of said at least one timing element means and consequently the onset of the advanced magnetization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification