Electronic control device for a refrigerant compressor

Abstract

The invention relates to an electronic control device ( 13 ) for a refrigerant compressor, comprising at least: a drive unit ( 18 ); and a compression mechanism ( 5 ) which is actively connected to the drive unit ( 18 ), with at least one piston ( 9 ) which is driven by a crankshaft ( 6 ) and moves back and forth between a lower and an upper dead point in a cylinder of a cylinder block ( 8 ), in which the electronic control device ( 13 ) is designed to detect, control and/or regulate the rotational speed (ω) of the drive unit ( 18 ) and to at least approximately detect the piston position, and in which the electronic control device ( 13 ) is designed to drive the compression mechanism ( 5 ) by means of the drive unit ( 18 ) in such a way that at least one drive angle segment (ΔΦ) and at least one transit angle segment (Δτ) is provided for the duration of a regulating time interval (Δt) comprising more than one crankshaft rotation, for a plurality of crankshaft rotations, preferably for each crankshaft rotation of the regulating time interval (Δt), and the compression mechanism ( 5 ) is subject to a positive operating torque (Bm) during the at least one drive angle segment (ΔΦ), and to a smaller positive operating torque (Bmv) compared to the positive operating torque (Bm) or to no positive operating torque (Bm) during the at least one transit angle segment (Δτ).

1 . An electronic control device for a refrigerant compressor, comprising at least
 a drive unit,   a compression mechanism that is actively connected to the drive unit, with at least one piston that is driven by a crankshaft and moves back and forth between a lower and an upper dead point in a cylinder of a cylinder block,   
       wherein the electronic control device is designed
 to detect and to control and/or regulate the rotational speed (ω) of the drive unit, and 
 to detect the piston position at least approximately, 
 
       wherein 
       the electronic control device as designed to drive the compression mechanism by means of the drive unit such that, for the duration of one regulating time interval (Δt) having more than one crankshaft rotation, for multiple crankshaft rotations, at least one drive angle segment (ΔΦ) and at least one transit angle segment (Δτ) are provided, and wherein the compression mechanism is exposed during the at least one drive angle segment (ΔΦ) to a positive operating torque (Bm), and during the at least one transit angle segment (Δτ) to a reduced positive operating torque (Bmv) relative to the positive operating torque (Bm), or to no positive operating torque (Bm). 
     
     
         2 . The electronic control device of a refrigerant compressor according to  claim 1 , wherein the ratio between positive operating torque (Bm) and reduced positive operating torque (Bmv) is ≥1/0.2. 
     
     
         3 . The electronic control device according to  claim 1 , wherein it is designed to provide multiple drive angle segments (ΔΦ n ) and multiple transit angle segments (Δτ n ) alternately during one crankshaft rotation. 
     
     
         4 . The electronic control device according to  claim 1 , wherein it is designed to provide the drive angle segment or segments (ΔΦ, ΔΦ n ) with positive operating torque (Bm) when the piston is located between a lower and an upper dead point in a compression phase. 
     
     
         5 . The electronic control device according to  claim 4 , wherein it is designed to provide exactly one drive angle segment (ΔΦ) and one transit angle segment (Δτ) during one complete crankshaft rotation. 
     
     
         6 . The electronic control device according to  claim 1 , wherein it is designed to provide the transit angle segment or segments (Δτ, Δτ n ) with reduced positive operating torque (Bmv) or with no positive operating torque when the piston is located between an upper and a lower dead point in an intake phase. 
     
     
         7 . The electronic control device according to  claim 1 , wherein it is designed to apply a braking torque to the compression mechanism during the transit angle segment or segments (Δτ, Δτ n ). 
     
     
         8 . The electronic control device according to  claim 1 , wherein it is designed to reduce or increase the rotational speed (ω) of the drive unit during the regulating time interval (Δt). 
     
     
         9 . The electronic control device according to  claim 1 , wherein it is designed to switch the drive unit to a powerless state at a switch-off time (AZ), so that this drive unit no longer generates positive operating torque (Bm), in order to let the compression mechanism run out to a standstill. 
     
     
         10 . The electronic control device according to  claim 9 , wherein it is designed to provide the regulating time interval (Δt) immediately before the switch-off time (AZ). 
     
     
         11 . The electronic control device according to  claim 9 , wherein it is designed to select the switch-off time (AZ) so that the kinetic energy of the compression mechanism at the switch-off time (AZ) is sufficient to enable the piston to overcome at least the next upper dead point following the switch-off time (AZ). 
     
     
         12 . The electronic control device according to  claim 9 , wherein it is designed to select the switch-off time (AZ) so that the piston of the compression mechanism comes to a standstill after reaching the next upper dead point following the switch-off time (AZ) and before reaching the lower dead point immediately following this upper dead point. 
     
     
         13 . The electronic control device according to  claim 9 , wherein it is designed to select the switch-off time (AZ) so that the piston of the compression mechanism comes to a standstill after the next upper dead point following the switch-off time (AZ) and before reaching a crank angle of 220° following this next upper dead point. 
     
     
         14 . The electronic control device according to  claim 1 , wherein it is designed to form the positive operating torque (Bm) during the at least one drive angle segment (ΔΦ) and/or the reduced positive operating torque (Bmv) during the at least one transit angle segment (Δτ), each with varying magnitude. 
     
     
         15 . The electronic control device according to  claim 14 , wherein it is designed to form the common profile of the positive operating torque (Bm) and the reduced positive operating torque (Bmv) for each crankshaft rotation so that it corresponds to the load torque (Lm) acting on the compression mechanism during this crankshaft rotation. 
     
     
         16 . A hermetically encapsulated refrigerant compressor with an electronic control device according to  claim 1 . 
     
     
         17 . The hermetically encapsulated refrigerant compressor according to  claim 16 , wherein an acceleration sensor is provided on the drive unit and/or a pressure sensor is provided in the cylinder of the cylinder block. 
     
     
         18 . A method for regulating a reciprocating piston refrigerant compressor, whose compression mechanism is driven with an operating torque by means of a drive unit, comprising the following steps
 during a regulating time interval (Δt) having more than one crankshaft rotation;   for multiple crankshaft rotations of the regulating time interval (Δt), the following is performed each time;   detect the position of the crankshaft or the piston of the reciprocating piston refrigerant compressor;   compare the detected position to at least one prespecified reference position;   starting from the at least one prespecified reference position, drive the compression mechanism with a positive operating torque (Bm) for the duration of at least one drive angle segment (ΔΦ) of one crankshaft rotation;   drive the compression mechanism with a reduced positive operating torque (Bmv) relative to the positive operating torque (Bm) or no positive operating torque for the duration of at least one transit angle segment (Δτ).   
     
     
         19 . The method according to  claim 18 , wherein the ratio between positive operating torque (Bm) and reduced positive operating torque (Bmv) is ≥1/0.2. 
     
     
         20 . The method according to  claim 18 , wherein multiple reference positions are provided during one crankshaft rotation. 
     
     
         21 . The method according to  claim 18 , wherein exactly one drive angle segment (ΔΦ) and one transit angle segment (Δτ) are provided during one crankshaft rotation. 
     
     
         22 . The method according to  claim 18 , wherein the at least one reference position is provided during a crank angle from 220° to 360°. 
     
     
         23 . The method according to  claim 18 , wherein the rotational speed of the reciprocating piston refrigerant compressor is reduced or increased during the regulating time interval (Δt). 
     
     
         24 . The method according to  claim 18 , wherein the regulating time interval (Δt) is provided immediately before a switch-off time (AZ), after which the drive unit is switched to a powerless state. 
     
     
         25 . The electronic control device of  claim 1 , wherein the multiple crankshaft rotations comprise each crankshaft rotation of the regulating time interval (Δt). 
     
     
         26 . The electronic control device of  claim 2 , wherein the reduced operating torque is ≥1/0.1. 
     
     
         27 . The electronic control device of  claim 2 , wherein the reduced operating torque is ≥1/0.03. 
     
     
         28 . The electronic control device of  claim 5 , wherein the exactly one drive angle segment (ΔΦ) is provided during a crank angle from 220° to 360°. 
     
     
         29 . The electronic control device of  claim 5 , wherein the exactly one drive angle segment (ΔΦ) is provided during a crank angle from 270° to 360°. 
     
     
         30 . The electronic control device of  claim 10 , wherein the regulating time interval (Δt) is begun when a signal of the electronic control device of a refrigerator signals that a target temperature has been reached in a cooling compartment. 
     
     
         31 . The method of  claim 18 , wherein the multiple crankshaft rotations comprise all crankshaft rotations. 
     
     
         32 . The method of  claim 19 , wherein the reduced operating torque (Bmv) is ≥1/0.1. 
     
     
         33 . The method of  claim 19 , wherein the reduced operating torque (Bmv) is ≥1/0.03. 
     
     
         34 . The method of  claim 22 , wherein the crank angle comprises 270° to 360°. 
     
     
         35 . The method of  claim 24 , wherein the regulating time interval (Δt) begins when a signal of the electronic control device of a refrigerator signals that a target temperature has been reached in the cooling compartment.