Fuel injector
AssigneeRobert Bosch GmbH
InventorsAssadollah Awarzamani, Stefan Maier
Life of this patent
Estimating the term…
Abstract
A fuel injector includes a magnetic coil whose power dissipation is utilized to pre-heat fuel flowing through the fuel injector. The magnetic coil is arranged so that a thermal coupling between the magnetic coil and the fuel flowing through a heat exchanger segment is acquired. In addition, a Peltier element (which functions as a heat pump) can be arranged between the magnetic coil and the heat exchanger segment. Furthermore, the fuel can also be heated using a heating coil.
Claims14
A fuel injector for a fuel injection system of an internal combustion engine, comprising:
- a valve seat element;
- a value needle including a valve closing element, the valve closing element cooperating with the valve seat element to form a sealed seat;
- a fuel inlet nozzle;
- a fuel feed channel extending from the fuel inlet nozzle to the sealed seat and including a heat exchanger segment;
- an armature connected to the valve needle;
- and
- a magnetic coil segmentally surrounding the fuel feed channel and cooperating with the armature to actuate the fuel injector, the magnetic coil being thermally coupled to the heat exchanger segment,
- wherein the magnetic coil is coupled to the heat exchanger segment one of directly and via a heat-conductive winding carrier holding the magnetic coil, and
- wherein the heat-conductive winding carrier extends from the magnetic coil to the valve seat element.
A fuel injector for a fuel injection system of an internal combustion engine, comprising:
- a valve seat element;
- a valve needle including a valve closing element, the valve closing element cooperating with the valve seat element to form a sealed seat;
- a fuel inlet nozzle;
- a fuel feed channel extending from the fuel inlet nozzle to the sealed seat and including a heat exchanger segment;
- an armature connected to the valve needle;
- and
- a magnetic coil segmentally surrounding the fuel feed channel and cooperating with the armature to actuate the fuel injector, the magnetic coil being thermally coupled to the heat exchanger segment,
- wherein the magnetic coil is coupled to the heat exchanger segment one of directly and via a heat-conductive winding carrier holding the magnetic coil,
- wherein the winding carrier includes a thin-wall sleeve composed of a high heat conductivity material, the thin-wall sleeve surrounding the heat exchanger segment, and
- wherein the magnetic coil is wound around the thin-wall sleeve.
A fuel injector for a fuel injection system of an internal combustion engine, comprising:
- a valve seat element;
- a valve needle including a valve closing element, the valve closing element cooperating with the valve seat element to form a sealed seat;
- a fuel inlet nozzle:
- a fuel feed channel extending from the fuel inlet nozzle to the sealed seat and including a heat exchanger segment;
- an armature connected to the valve needle;
- a magnetic coil segmentally surrounding the fuel feed channel and cooperating with the armature to actuate the fuel injector, the magnetic coil being thermally coupled to the heat exchanger segment;
- and
- a Peltier element operating as a heat pump and being positioned between the magnetic coil and the heat exchanger segment, the Peltier element having a first surface facing the heat exchanger segment and a second surface facing the magnetic coil,
- wherein the magnetic coil is coupled to the heat exchanger segment one of directly and via a heat-conductive winding carrier holding the magnetic coil, and
- wherein, when the Peltier element is operating, a first temperature of the first surface increases and a second temperature of the second surface decreases.
A fuel injector for a fuel injection system of an internal combustion engine, comprising:
- a valve seat element;
- a valve needle including a valve closing element, the valve closing element cooperating with the valve seat element to form a sealed seat;
- a fuel inlet nozzle;
- a fuel feed channel extending from the fuel inlet nozzle to the sealed seat and including a heat exchanger segment;
- an armature connected to the valve needle;
- a magnetic coil segmentally surrounding the fuel feed channel and cooperating with the armature to actuate the fuel injector, the magnetic coil being thermally coupled to the heat exchanger segment;
- and
- a heating coil positioned between the magnetic coil and the sealed seat and extending along a fuel flow direction,
- wherein the magnetic coil is coupled to the heat exchanger segment one of directly and via a heat-conductive winding carrier holding the magnetic coil.
Dependencies are inferred from the claim text.