Abstract: A glow pin control circuit for controlling the electrical heating energy of a glow pin, in particular for auxiliary heating apparatus in vehicles. The control circuit including a switch that alternatingly turns on and off the supply voltage in modulated and clocked manner and is situated between the supply voltage terminal (V+) on the high potential side. The glow pin (G) may be designed without a regulating filament.

Abstract: Curved inlet pipes, which themselves are assembled from at least two curved individual pipes, are provided in an exhaust manifold with sheet metal inlet pipes from the respective cylinder head outlet to a common exhaust gas outlet. As a result, the sum of the moments of resistance is substantially smaller, especially in the case of short, curved inlet pipes, which prolongs the service life of a sheet metal exhaust manifold.

Abstract: An air gap-insulated exhaust pipe with a sliding fit between two inner pipe sections in a middle area of the length of the exhaust pipe has a radial mounting of the inner pipe in the outer pipe which is provided in the area of a bend or beyond the bend, which joins the leg of the exhaust pipe in which the sliding fit is located. In terms of manufacturing technique, the radial mounting may be prepared before or after the bending of the double-pipe arrangement. The sliding fit may be prepared, even in the case of a straight exhaust pipe, manifold, or the like, by using a spacer sleeve and joint calibration of the pipe ends of the inner pipe sections, and the spacer sleeve burns off at the time the exhaust pipe is put into operation for the first time. As an alternative, the sliding fit may also be prepared by polygon calibration and rotating the pipe ends by half the pitch of the polygon.

Abstract: A diagnostic system for sensing and displaying malfunctions of a heating apparatus installed in a vehicle, wherein the display is effected by a display device of an on-board timer for the heating apparatus.

Abstract: In a vehicle heating appliance, an overhead state is detected by an overheating temperature sensor by means of a microprocessor. The overheating temperature sensor supplies a signal (UTF) to the microprocessor, and when the signal (UTF) exceeds a threshold value, the microprocessor blocks the transmission of driving signals to a driving transistor (Tr) for the fuel dosing pump. A circuit connected in parallel to the microprocessor with a threshold value switch acts as a redundant switching-off device. The output signal of the threshold value switch is applied to an AND-gate whose output is connected to the base of the driving transistor (Tr) and whose other input receives the driving signals from the microprocessor. When the signal UFT exceeds the threshold value of the threshold switch, the AND-gate blocks all signal transmission from the microprocessor to the driving transistor, so that the fuel dosing pump is stopped.

Abstract: A process for preparing catalytic converters, especially bodies of motor vehicle catalytic converters of modular design, by pushing monoliths and a surrounding support jacket into prefabricated tubes, whose cross section essentially corresponds to the profile of the monolith plus an addition for the support jacket. The dimensions of the tube (housing) are adapted to a constant gap (s) from the monolith by sizing (calibrating) the prefabricated tubes which initially have a smaller cross section.

Abstract: An engine-independent vehicle heating appliance has a combustion air fan, a fuel dosing pump and a heat exchanger that surrounds the combustion chamber, as well as a controller that controls the operation of the vehicle heating appliance. In compact designs, special measures are required to protect the electronic components of the controller from overheating. In order to carry off heat in an effective manner, the controller has a heat conducting plate upon which the electronic power components (18) are mounted, their connections being electrically connected to the wiring on the board (16). Loss heat that results from the operation of the components (18) is carried away by the material of the heat conducting plate (8a, 8b) to the fan housing (6). Since the latter is always cool a sufficient cooling of the components (18) is ensured.

Abstract: A heat exchanger (1) acting in the manner of a radiator can be thermally coupled with a first heat source (internal combustion engine 2) and/or with a second heat source (burner 3 which can be operated independently from the internal combustion engine) via a fluidic heat carrier circuit, especially a water circuit. In addition to other parameters, the temperature of the first heat source can also be taken into account in the control of the heat carrier circuit by thermal setting elements (13).

Abstract: The vehicle heater described has a burner supplied from a tank through a fuel line to which a pressure-controlled fuel pump (2) and a solenoid valve (24) are connected. The solenoid valve offers a relatively high resistance to the flow of fuel. The pressure in the pump delivery line thus drops relatively slowly. If vapor/gas forms in the fuel line (L2, L3, L4) due to overheating, it must be driven out of the line as rapidly as possible when the heater is switched on. The solenoid valve (24) offers only a low resistance to air/vapor/gas, resulting in a rapid drop in pressure at the pump delivery outlet and hence an increase in pump frequency (i.e. pump performance). The gas is therefore driven very rapidly out of the line between the pump and the burner, thus avoiding any interruptions in operations due to gas/vapor which has collected in the fuel line.

Abstract: The invention pertains to a burner of a vehicle heater which includes a blower for supplying the combustion air, a combustion chamber having a lining which is porous at least in some areas on part of its inner surface, a means for supplying fuel to the porous area of the lining and an electric glow plug for igniting the fuel or fuel-air mixture evaporated from the lining.

Abstract: A vehicle heater with a pot-shaped, double-jacketed heat exchanger and a burner for the fuel to be burned extending into the heat exchanger coaxially to an axis of the heat exchanger. The burner has a combustion chamber with a flame sensor disposed within it. A side channel fan is provided for feeding combustion air into the combustion chamber. The burner has a glow plug positioned to be swept by a small partial flow of the combustion air for igniting the fuel. The axis of the heat exchanger and an axis of the fan intersect each other approximately at right angles. The heat exchanger has a central opening closed by a one-part angle flange with a angle flange first leg and with a angle flange second leg extending approximately at right angles to the angle flange first leg. The angle flange first leg is located in a plane extending approximately in parallel to the axis of the heat exchanger and the angle flange second leg is located in a plane directed at right angles thereto.

Abstract: In a vehicle heating appliance, a burner is supplied with combustion air by a combustion air fan and with fuel by a fuel dosing pump. The heat generated by the burner in a combustion chamber is absorbed by a liquid or gaseous heat transfer medium through a heat exchanger that surrounds the combustion chamber and is transferred to the areas to be heated. In order to avoid malfunctions of the fuel dosing pump caused by steam bubbles produced by overheating, the fuel dosing pump must be kept cool. To ensure an efficient cooling of the fuel dosing pump, the fuel dosing pump is mounted in a compact manner in a suction channel (8) of the combustion air fan (1). When the vehicle heating appliance is in operation, combustion air flows past the outer surface of the fuel dosing pump (14) and cools the pump before being led to the inlet side of the combustion air fan (1, 4).

Abstract: A method for uniting an exhaust treatment body (2) surrounded by a bedding mat (6) with a metal case (8) forming a housing for the exhaust treatment body, characterized in that one or two preformed metal blanks are pressed by means of a form tool (10) against the exhaust treatment body (2) surrounded by the bedding mat (6) and thereby brought into the final case form; and the thus formed metal blank or blanks are welded to the case (8) along one or two longitudinal seams (28). An afflux funnel (44) and a discharge funnel are preferably welded on by means of a special triple seam (56).

Abstract: In a vehicle heating appliance, water is pumped as heat transfer medium through a heat exchanger that surrounds the combustion chamber. The water pump is mounted above the heat exchanger and pumps the water it axially receives into the heat exchanger through a tangential pump outlet pipe. To vent the pump, a connection hole with a small cross-section is provided in the top area of the pump part of the water pump. The connection hole leads to the system flow pipe. Any air bubbles accumulated in the pump chamber of the pump part reach the flow pipe through the connection hole, propelled by their own ascending force and helped by the geometric arrangement of the pump chamber and return pipe, including the connection hole, and/or additionally by the pressure difference between the pump chamber and the return pipe.