By Bjorn Eriksson.
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Extra info for Control strategy for energy efficient fluid power actuators : utilizing individual metering
Then it retracts and perform the opposite motion, from its outer position to its inner position, 30s to 50s. 4. 2(e). 4. At 14s a suspicious change of speed can be observed. This is because the area ratio was not concerned correctly in the implementation. Constant flow rather the constant speed was demanded when the system switched from meter-out to meter-in mode. It does not change the significance of the measurements, it can be regarded as a step in the reference signal at the time 14s. 2(a) Pressures during the motion, pump pressure (dotted), tank pressure (dash-dotted), A-chamber pressure (dashed), B-chamber pressure (solid).
This concerns the boom cylinders, the tilt cylinder and the steering cylinders. The presented figures are thus not valid for a whole vehicle, only the working hydraulics subsystem. 1 Calculation cases This section describes the different cases used when the energy consumption of the short working cycle was calculated. All calculations in this section are only rough estimations, but they give a good overall picture of the difference between the working hydraulics configurations in respect of energy consumption.
Float operation; no energy is needed to perform the operation. 3. Regenerative operation; a good option if the pump pressure is high at the moment (another load has a higher pressure demand) so that less flow is then taken from the pump. 4. The conventional way; has to be used at the load with highest pressure demand. By using independent meter-in and meter-out valves the meter-out pressure drop can be smaller than usual. In this thesis meterout always denotes where flow is leaving the cylinder and meter-in always relates to flow coming in to the cylinder.
Control strategy for energy efficient fluid power actuators : utilizing individual metering by Bjorn Eriksson.