A system. The system includes a control module of a fluid system of a machine, a battery, a fluid component and an electrical circuit. The electrical circuit is configured to electrically couple the battery to the control module via the fluid component, and to activate the control module when the machine is powered down.

A system. The system includes a control module of a fluid system of a machine, a battery, a fluid component and an electrical circuit. The electrical circuit is configured to electrically couple the battery to the control module via the fluid component, and to activate the control module when the machine is powered down.

The invention relates to a lubricating system for an internal combustion engine (1). The system includes a first conduit means (7) connecting a lubricant supply source (5) to the internal combustion engine (1) for supplying lubricant to the internal combustion engine (1). According to the invention, the system further includes a second conduit means (8) connecting a gas supply source to the first conduit means (7) for supplying gas to the first conduit means such that gas bubbles are formed in the first conduit means (7). A sensor (3) detects whether lubricant or whether gas is present in a certain part of the first conduit (7). The certain part being located downstream the connection of the second conduit means (8) to the first conduit means (7). A control unit (6) is connected to the sensor (3), which control unit (6) is arranged to determine whether lubricant is flowing through the first conduit means (7) or not, in response to the detections of the sensor (3). The invention also relates to an internal combustion engine, to a power tool and to a method for providing lubricant to an internal combustion engine.

The invention relates to a lubricating system for an internal combustion engine (1). The system includes a first conduit means (7) connecting a lubricant supply source (5) to the internal combustion engine (1) for supplying lubricant to the internal combustion engine (1). According to the invention, the system further includes a second conduit means (8) connecting a gas supply source to the first conduit means (7) for supplying gas to the first conduit means such that gas bubbles are formed in the first conduit means (7). A sensor (3) detects whether lubricant or whether gas is present in a certain part of the first conduit (7). The certain part being located downstream the connection of the second conduit means (8) to the first conduit means (7). A control unit (6) is connected to the sensor (3), which control unit (6) is arranged to determine whether lubricant is flowing through the first conduit means (7) or not, in response to the detections of the sensor (3). The invention also relates to an internal combustion engine, to a power tool and to a method for providing lubricant to an internal combustion engine.

Internal combustion engines having multi-stage telescoping poppet valves in lieu of conventional poppet valves are disclosed. The engines may have pistons with a skirt with a field of pockets that provide a ringless, non-lubricated, seal equivalent. The piston heads may include one or more depressions and may be domed to facilitate the movement of air/charge in the cylinder. The engines may also have non-circular, preferably rectangular, cross-section pistons and cylinders. The engines also may include a split crankshaft. The engines may use the pumping motion of the engine piston to supercharge the cylinder with air/charge. The engines also may operate in an inverted orientation in which the piston is closer to the local gravitationally dominant terrestrial body's center of gravity at top dead center position than at bottom dead center position.

Internal combustion engines having multi-stage telescoping poppet valves in lieu of conventional poppet valves are disclosed. The engines may have pistons with a skirt with a field of pockets that provide a ringless, non-lubricated, seal equivalent. The piston heads may include one or more depressions and may be domed to facilitate the movement of air/charge in the cylinder. The engines may also have non-circular, preferably rectangular, cross-section pistons and cylinders. The engines also may include a split crankshaft. The engines may use the pumping motion of the engine piston to supercharge the cylinder with air/charge. The engines also may operate in an inverted orientation in which the piston is closer to the local gravitationally dominant terrestrial body's center of gravity at top dead center position than at bottom dead center position.

The invention relates to a method for controlling the oil pressure of an oil pump (40, 140) in a combustion engine (100). The combustion engine (100) comprises a crankcase (11) and a separator (14, 114) for separating oil present in a blow-by gas from the crankcase (11). The method comprises the step (201) of providing oil pressure demand for a set of different engine operation conditions, the oil pressure demand defining the theoretical required oil pressure of the oil pump (40, 140); the step (203) of controlling the oil pressure of the oil pump (40, 140) based on the oil pressure demand for at least one engine operation condition in the set of different engine operation conditions; the step (205) of driving the separator (14, 114) using oil from the oil pump (40, 140), the oil being pressurized based on the oil pressure demand.

The invention relates to a method for controlling the oil pressure of an oil pump (40, 140) in a combustion engine (100). The combustion engine (100) comprises a crankcase (11) and a separator (14, 114) for separating oil present in a blow-by gas from the crankcase (11). The method comprises the step (201) of providing oil pressure demand for a set of different engine operation conditions, the oil pressure demand defining the theoretical required oil pressure of the oil pump (40, 140); the step (203) of controlling the oil pressure of the oil pump (40, 140) based on the oil pressure demand for at least one engine operation condition in the set of different engine operation conditions; the step (205) of driving the separator (14, 114) using oil from the oil pump (40, 140), the oil being pressurized based on the oil pressure demand.

Provided is power work equipment using a fuel container and/or a lubricating oil container that is/are easily replaced for the power work equipment, and supply(ies) liquid fuel and/or lubricating oil optimized for driving. A chainsaw (1A) (power work equipment) includes a main body (10) having an internal combustion engine (50), and a fuel container (90A) and/or a lubricating oil container (100A) detachably attached to the main body (10). A connection part (92) of the fuel container (90A) is connected with the fuel suction unit (60) in a liquid-tight manner, and the bag (91) is configured to collapse as liquid fuel (F) in the bag (91) decreases. A connection part (102) of the lubricating oil container (100A) is connected with a lubricating-oil suction unit (70) in a liquid-tight manner, and a bag (101) is configured to collapse as lubricating oil (L) in the bag (101) decreases.

Provided is power work equipment using a fuel container and/or a lubricating oil container that is/are easily replaced for the power work equipment, and supply(ies) liquid fuel and/or lubricating oil optimized for driving. A chainsaw (1A) (power work equipment) includes a main body (10) having an internal combustion engine (50), and a fuel container (90A) and/or a lubricating oil container (100A) detachably attached to the main body (10). A connection part (92) of the fuel container (90A) is connected with the fuel suction unit (60) in a liquid-tight manner, and the bag (91) is configured to collapse as liquid fuel (F) in the bag (91) decreases. A connection part (102) of the lubricating oil container (100A) is connected with a lubricating-oil suction unit (70) in a liquid-tight manner, and a bag (101) is configured to collapse as lubricating oil (L) in the bag (101) decreases.