Abstract:
Die Erfindung betrifft ein Verfahren zur Regelung eines elektrischen Antriebs eines elektrisch angetriebenen Druckluftverdichters eines Kraftfahrzeugs. Die Erfindung betrifft ferner einen entsprechenden Regelkreis. Erfindungsgemäß wird ein momentanes an einer Antriebswelle des Druckluftverdichters anliegendes Lastdrehmoment (31) des Druckluftverdichters als Funktion von mindestens einem Betriebsparameter (22) geschätzt und als Störgrößenschätzung auf den Regelkreis des elektrischen Antriebs (20) geschaltet, um einen durch das anliegende Lastdrehmoment (31) erzeugten Regelfehler zu reduzieren.
Abstract:
The invention relates to a stroke-adjustable air conditioning compressor, in particular for motor vehicles, comprising a drive mechanism for pistons that move back and forth, the pistons being driven by means of an adjusting plate, such as a pivoting plate, pivoting ring or swash plate at an adjustable pivoting angle. The position of the pivoting angle is influenced inter alia by compressive forces, inertial forces and elastic forces that are active in the drive mechanism.
Abstract:
The air conditioning system 100 may include a compressor 101, a heating circuit 152, and a refrigerant releaser 181. The compressor 101 may have a suction port 115 for drawing refrigerant and a discharge port for 120 discharging compressed refrigerant. The heating circuit 152 has a passage 152a that extends from the discharge port 120 to the suction port 115 though a heat exchanger 159. The refrigerant releaser 181 may release the refrigerant from the discharge port 120 to the suction port 115 when the discharge pressure Pd of the refrigerant results a predetermined high-pressure state during the operation of the heating circuit 152. The air conditioning system 100 can solve a problem of insufficient heating performance due to releasing the refrigerant in the heating circuit into the cooling circuit to alleviate the abnormally high-pressure state during operation of the heating circuit.
Abstract:
A control system of a hydraulic pump (1) in a load sensing control hydraulic drive circuit, comprising: a first means (202) in which a target pressure difference between the discharge pressure of the hydraulic pump and the load pressure of an actuator (2) is set as a variable value; second means (203, 210-213) for determining a controlling coefficient which increases with an increase in deviation of this target pressure difference as a variable value from an actual pressure difference, decreases with a decrease thereof and increases for a relatively small deviation of the pressure difference when the target pressure difference is small; and third means (205, 206) for determining the target displacement volume from the deviation of the pressure difference and the controlling coefficient; whereby, irrespective of a value of the target pressure difference, stabilized control of the hydraulic pump can be performed, without causing hunting when the operating speed of a control lever (3a) is low, and, when the operating speed of the control lever is high, the control of the hydraulic pump with prompt and quick responses can be performed.
Abstract:
A control system of a hydraulic pump (1) in a load sensing control hydraulic drive circuit, comprising: a first means (202) in which a target pressure difference between the discharge pressure of the hydraulic pump and the load pressure of an actuator (2) is set a variable value; second means (203, 210-213) for determining a controlling coefficient which increases with an increase in deviation of this target pressure difference as a variable value from an actual pressure difference, decreases with a decrease thereof and increases for a relatively small deviation of the pressure difference when the target pressure difference is small; and third means (205, 206) for determining the target displacement volume from the deviation of the pressure difference and the controlling coefficient; whereby, irrespective of a value of the target pressure difference, stabilized control of the hydraulic pump can be performed, without causing hunting when the operating speed of a control lever (3a) is low, and, when the operating speed of the control lever is high, the control of the hydraulic pump with prompt and quick responses can be performed.