초록

A vegetation mower incorporating a drive train using two mechanical transmissions to selectively drive the ground engaging wheels at different speeds. The drive train incorporates a single pulley belt to transfer power from the mower engine to the drive wheels.

대표청구항 ▼

A vegetation mower incorporating a drive train using two mechanical transmissions to selectively drive the ground engaging wheels at different speeds. The drive train incorporates a single pulley belt to transfer power from the mower engine to the drive wheels. mfort functions μ as separate function

A vegetation mower incorporating a drive train using two mechanical transmissions to selectively drive the ground engaging wheels at different speeds. The drive train incorporates a single pulley belt to transfer power from the mower engine to the drive wheels. mfort functions μ as separate function of the flow (Q1,Q2. . . ) through each of said external and internal openings (1,2,3), and determination of said internal pressure P1,the flow through (Q1,Q2. . . ) each opening and the perceived comfort level (μ) as functions of said adjustment parameters (S1,S2) and entering the resulting comfort function in a common coordinate system before conducting said fuzzy optimization. 4. A method as claimed in claim 1, characterized in that said set of adjustment parameters (S1,S2) is determined in a continuous cooling mode to control said operator units (4, 5) to adjust said passive ventilation devices within a range of ventilation positions. 5. A method as claimed in claim 1, characterized in that said set of adjustment parameters (S1,S2) is determined in a pulse mode for intermittent short term operation of said operator units (4, 5) to open and reclose said passive ventilation devices between a closed position and any position within a range of ventilation positions. 6. A computer controlled system for carrying out a method as claimed in claim 1, by natural ventilation in a living room in a building occupied by human users, said room being connected with the outside of the building through at least two external openings (1, 2) with associated passive ventilation devices, which are individually adjustable by means of associated operator units (4, 5) and being further connected through at least one internal opening (3) with another room of the building, said natural ventilation being determined from a constant physical parameter of said living room and measured parameters relating to wind load or air pressure and difference (ΔT) between indoor and outdoor temperatures (TI,TO) to approximate a target air exchange rate for said living room, characterized by comprising a computer device (9) and sensor means (10, 12, 13) for sensing said wind load or air pressure and said temperature parameters and inputting corresponding wind and temperature data to said computer device (9), said computer device (9) having means for storing a target air exchange rate for said living room, means for determination of an adjustment parameter (S1,S2) for the operator units of each of said passive ventilation devices to provide an air exchange (Qf) to the room on the basis of said target air exchange rate, means for establishing a set of comfort functions (μ) individually for each of said external and internal openings to take account at least of outside and inside temperature (TI,TO), air exchange and wind load or air pressure, and means for modification of said adjustment factors (S1,S2) by application of said set of comfort functions weighed by fuzzy optimization to produce optimized and substantially equally distributed comfort conditions in positions in the living room adjacent each of said openings. 7. A system as claimed in claim 6, characterized by comprising means for shifting the operation of said computer device between said cooling mode and said pulse mode of operation. 8. A system as claimed in claim 6, characterized in that said means for establishing said individual comfort functions and said means for modification of said adjustment factors comprises means for carrying out fuzzy logic computing operations. 9. A system as claimed in claim 6, wherein said external openings (1, 2) are windows having a sash structure, which is openable with respect to a stationary main frame structure within a range of ventilation positions between closed and fully open positions, and said associated operator units comprises a window operator unit for each of said windows, characterized in that each of said operator units (4, 5) comprises a chain operator with an operator housing connected with an elem