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Ab Volvo

Autopart Sweden Ab

Dynapac Heavy Equipment Ab

Safetrack Infrasystems Sisab Ab

Concorde Invest Ab

Volvo Tekisk Utveckling Ab

Bo Karl Svensson

Jan Eismark

Anders Hoglund

Torsten Båvhammar

Johan Båvhammar

Richard Lettström

Peter Kylin

Mats Bjorsne

A method for controlling a brazing process, including the steps of applying a welding current through an electrode () pressed to a metal surface () of a workpiece to form a welding arc. Further steps are continuously measuring the welding current and the welding time, continuously determining supplied energy on the basis of the welding current and the welding time, digitally switching current supplied from batteries of a DC source () and to maintain a substantially constant welding current, interrupting the supply of welding current when a predetermined amount of energy has been supplied and supplying heat to batteries when a temperature of the batteries is below a predetermined value. The apparatus comprises a control module () with a central unit ()and a power control unit () wherein the central unit () and the control unit () are operatively connected for continuously measuring the welding current, a switched circuit module () producing a substantially constant welding current of a predetermined value and a first temperature transducer () provided in the vicinity of batteries included in the DC source (). A heat transfer means () is activated when the temperature of the batteries is below a predetermined value.

Method and a device for brazing

A pedestrian warning device for a vehicle (), especially a vehicle which is intended to be driven on public roads, includes a programmable unit, such as a CPU (), and a brake pedal (). The device includes further at least one front brake lamp () mounted at the front portion of the vehicle (). The front brake lamp can be lightened up by the programmable unit () when certain predetermined conditions are met. Moreover, the device includes an awareness signal apparatus () provided with at least one awareness lamp ().

Pedestrian warning device for a vehicle

Method of controlling the injection of a fluid into an internal combustion engine, comprising a piston reciprocating in a cylinder between top and bottom dead center points, and a nozzle arranged in the cylinder. The method includes injecting a fluid with an initial injection pressure into the cylinder, the fluid being ignited, so that the pressure in the cylinder increases, thereby causing the piston to be displaced towards the top dead center point, and effecting at least one injection pause during injection. The injection, immediately after the injection pause, is effected so that the injection pressure has increased in an interval of more than 0 bar and up to 2000 bar relative to an injection pressure prevailing immediately prior to the injection pause, and the injection pause is effected for a duration corresponding to an angle of rotation of an engine crankshaft in the interval 1&#xb0;-30&#xb0;.

Method of controlling the injection of fluid into an internal combustion engine

A method of controlling the fuel injection in an internal combustion engine ( ) having a piston ( ), which passes to and for in a cylinder ( ) between an upper and a lower dead center, and an injection nozzle ( ), which is disposed in the cylinder ( ), the method including the steps whereby a primary injection of fuel is realized in the cylinder ( ), which fuel is ignited and causes the piston ( ) to be moved in the direction of the lower dead center in the cylinder ( ), and whereby a post-injection of a fluid is realized in the cylinder ( ). The injection pressure of the fluid in the post-injection is higher than the injection pressure of the fuel in the primary injection.

Method of controlling the fuel injection in an internal combustion engine

Gripping arrangement

Combined parting tool and material feeding arrangement

The invention relates to a dual steering system for a tandem-type surface compacting machine equipped with two independent steering modes, for example, a machine equipped with both frame steering (3) and with individual steering (6) of one of the rollers (4a). The invention provides a control of both systems, one enabled by a steering-wheel activated steering valve (11) and the other enabled by a joystick-activated control valve ( 12). The control valve ( 12) is operatively connected to the switching valves (14a to 14d) which are activated with an electric switch in such a way that the machine operator can instantly select the steering mode whose activation with the steering wheel or joystick he deems most appropriate at any given time.

Steering system for a surface compacting machine

Heating pad, particularly for vehicle seats

Growing community of inventors

Stockholm, Sweden

Bo Karl Svensson