Combustion chamber pressure gauge
AssigneeBorgWarner BERU Systems GmbH
InventorsMichael Hauβner, Christian Pottiez
Life of this patent
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Abstract
A combustion chamber pressure gauge for an internal combustion engine, comprising a housing tube, a plunger, which is movable in an axial direction in the housing tube under the effect of combustion chamber pressure against a restoring force, and comprising a seal, which is disposed between the plunger and the housing tube, and comprising a sensor for detecting an axial displacement of the plunger. The sensor is decoupled from thermally induced expansions or contractions of the housing tube, in that the sensor is attached to a carrier, which is suspended in the housing tube, and the plunger is movable relative to the carrier under the effect of combustion chamber pressure.
Claims22
A combustion chamber pressure gauge for an internal combustion engine, comprising:
- a housing tube;
- a plunger, which is movable in an axial direction in the housing tube under the effect of combustion chamber pressure against a restoring force;
- a seal, which is disposed between the plunger and the housing tube;
- and
- a sensor for detecting an axial displacement of the plunger, wherein the sensor is decoupled from expansions or contractions of the housing tube in that the sensor is attached to a carrier, which is suspended in the housing tube, and in that the plunger is movable relative to the carrier under the effect of combustion chamber pressure.
A combustion chamber pressure gauge for an internal combustion engine, comprising:
- a housing tube;
- a carrier suspended in the housing tube;
- a plunger movable axially with respect to the housing tube and to the carrier under the effect of combustion chamber pressure;
- a seal disposed between the plunger and the housing tube;
- and
- the carrier carrying a sensor configured to detect axial displacement of the plunger, wherein the carrier has a section adjacent the sensor that is free from connection to the housing tube and is movable relative to the housing tube, whereby transfer of thermal contractions and expansions from the housing tube to the sensor are reduced.
A combustion chamber pressure gauge for an internal combustion engine, comprising:
- a housing tube;
- a carrier suspended in the housing tube, the carrier having a first section affixed to the housing tube and a second section that is free from connection to the housing tube, the second section of the carrier and the housing tube being movable relative to one another when the housing tube expands or contracts;
- a plunger movable axially with respect to the housing tube and to the carrier under the effect of combustion chamber pressure;
- a seal disposed between the plunger and the housing tube;
- and
- the second section of the carrier carrying a sensor configured to detect axial displacement of the plunger, whereby transfer of thermal contractions and expansions from the housing tube to the sensor are reduced.
Dependencies are inferred from the claim text.