A pressure-sensor-integrated glow plug which can increase reliability of a bonding portion between a ceramic heater and a metal-made outer sleeve while being manufactured with relatively simple manufacturing steps and, at the same time, can maintain airtightness over a long period, and a method of manufacturing such a pressure-sensor-integrated glow plug.

This document describes a heating rod for a glow plug with a ceramic glow element having a glow tip at its front end and a connector portion at its rear end, a contact element making electrical contact with the connector portion of the glow element, and a sheath, from which the front end of the glow element protrudes. According to this disclosure, the contact element is pressed against the glow element under pre-tension. Furthermore, this document describes a method for producing such a heating rod and a glow plug with such a heating rod.

A glow plug is described, having a body, a glow pin which protrudes from a first end of the body, and an inner pole which protrudes from a second end of the body and is electrically connected to the glow pin. A section of the inner pole that protrudes out of the body has an embossed structure for improving the mechanical and electrical connection to a plug connector. A method for producing a glow plug is also disclosed.

A glow plug including a substantially cylindrical housing extending in an axial direction; a rod-shaped heater unit having a front end protruding from the front end of the housing and movable in the axial direction; a connecting member connecting the heater unit to the housing within the housing and allowing the heater unit to move in the axial direction; and a pressure sensor that detects pressure received by the heater unit. The heater unit has a large-diameter portion at the rear end thereof and a small-diameter portion frontward of the large-diameter portion and having a diameter smaller than the diameter of the large-diameter portion. The connecting member connects the small-diameter portion of the heater unit to the housing within the housing.

A metal shell of a glow plug mounted on an engine head of a diesel engine and a method of manufacturing the same are disclosed. The metal shell has an improved multi-stage structure, which allows the metal shell to be easily manufactured regardless of overall length of the metal shell and allows a metal shell section fastened to the engine head and at least one of the other metal shell sections to have different material strengths, thereby increasing fastening strength of the metal shell to the engine head and preventing warpage of the metal shell while improving productivity while reducing manufacturing costs. The metal shell of a glow plug for diesel engines according to the invention includes a plurality of metal shell sections disposed in an axial direction of the glow plug and having different material strengths.

Sparkless igniters for pilot services comprising hot surface igniter elements, and methods for operating these igniters without the use of flame rods or thermocouples. The electrical resistance of the hot surface igniter element is measured and used to control the operation of the igniters using a suitable burner management system. The measured electrical resistance may also be manipulated to yield a control parameter for use in the burner management system. The igniters are designed to prevent quenching of the hot surface elements by the fuel-air mixture. The igniters optionally permit easy swap out of hot surface igniter elements.

Sparkless igniters for pilot services comprising hot surface igniter elements, and methods for operating these igniters without the use of flame rods or thermocouples. The electrical resistance of the hot surface igniter element is measured and used to control the operation of the igniters using a suitable burner management system. The measured electrical resistance may also be manipulated to yield a control parameter for use in the burner management system. The igniters are designed to prevent quenching of the hot surface elements by the fuel-air mixture. The igniters optionally permit easy swap out of hot surface igniter elements.

A glow plug includes a cylindrical housing, a rod-shaped heater, a membrane portion, and a pressure sensor. The cylindrical housing extends along an axial direction. The rod-shaped heater extending along the axial direction is displaced along the axial direction and has one end portion disposed within the housing, and an other end portion which is exposed from the housing. The membrane portion connects together the heater and the housing and has a multi-layer construction which has a first layer and a second layer of which at least part is positioned nearer to the other end portion in the axial direction of the heater than the first layer. The pressure sensor measures a pressure within a combustion chamber in which the other end portion is disposed by making use of a displacement of the heater. A thickness of the second layer is larger than a thickness of the first layer.

A glow plug wherein a combustion gas prevention wall (67) extends radially outward on the outer circumferential surface of heater (10) such that when the heater (10) is viewed rearward from its forward end (10a) along the axial direction, the combustion gas prevention wall (67) closes an annular gap K1 at a position forward of annular membrane portion (63) of seal member (60). The combustion gas prevention wall (67) has an outer diameter D2 greater than the inner diameter D1 of forward end (136) of the housing.

A method for regulating or controlling the temperature of a sheathed-element glow plug in a heating phase of the sheathed-element glow plug, where a temperature value is determined as a function of a resistance of the sheathed-element glow plug. To render possible the regulation or control of the temperature of the sheathed-element glow plug also during a transient temperature distribution within the sheathed-element glow plug, the resistance used for determining the temperature value during a transient thermal response within the sheathed-element glow plug is calculated with the aid of a physical model.