Analysis of Influence of Engine Speed ​​in Automobile Air Conditioning

The controller of a car air conditioner should be able to control evaporation temperature, superheat, compressor speed, opening of an electronic expansion valve, evaporator fan speed, and vehicle interior temperature according to a certain performance index. Unlike household air conditioners, the speed of the car air-conditioning compressor changes as the engine speed of the car changes.

The refrigerating capacity of the passenger car air conditioning is greatly affected by the engine speed, so the car air-conditioning control system is a multi-variable control system, and the relationship between the control parameters affects the quality of the car air-conditioning control system. Therefore, it is very important to design a controller with a simple pre-compensator for solving the sedan system of the car air conditioner.

The air conditioning system is mainly composed of compressor accumulators, expansion valves and other equipment. In a conventional semi-mechanical control system, a fixed-capacity compressor controls the on/off of the compressor through an electromagnetic clutch according to the evaporation temperature, and the thermal expansion valve reduces the pressure of the high-pressure liquid refrigerant to the evaporation pressure so that it can vaporize in the evaporator. Heat, in addition it can also control the flow to the evaporator.

Conventional fixed-capacity compressors and expansion valves have not been able to meet the requirements of high-efficiency and energy-saving automatic control. Therefore, the control system of the car air-conditioning must be studied with a new implementing agency. A multi-variable control strategy is adopted, and a variable-speed compressor and an electronic expansion valve are used to comprehensively control the evaporation pressure and the degree of superheat.

In the experiment, a variable-capacity compressor was simulated using a constant-capacity compressor driven by an AC motor, and an electronic expansion valve driven by a stepper motor was used for experiments.

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Optogenetics is a booming multidisciplinary bioengineering technology. It has the characteristic of high spatial-temporal resolution and cell-type specific. It overcomes the disadvantages of traditional methods of the activity control for the cell and organism, and also provides a revolutionary method for the research of neuroscience. The research fields include fundamental research of neural circuit, study and memory research, habituation research, dyskinesia, sleep disorders, parkinsonism, depressive disorder, anxiety disorder etc., and many classic laboratory animal germ line (drosophila melanogaster, nemathelminth, mice, Marmoset, and machin etc.)
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(1) Optogenetic stimulation of a hippocampal engram activates fear memory recall (Nature, 484(7394): 381–385. doi:10.1038/nature11028) (CNI-473nm)

(2) Ultrahigh accuracy imaging modality for super-localization microscopy (Nature Methods, VOL.10,2013,335) (CNI-635nm and 488nm)

(3) Optogenetic silencing of locus coeruleus activity in mice impairs cognitive flexibility in an attentional

set-shifting task (ORIGINALRESEARCH doi: 10.3389/fnbeh.2015.00286) (CNI-589nm)

(4) Optogenetic Evidence That Pallidal Projections, Not Nigral Projections, from the Nucleus Accumbens Core Are Necessary

for Reinstating Cocaine Seeking (The Journal of Neuroscience, 2013•33(34):13654–13662) (CNI-561nm)

(5) Control of a specific motor program by a small brain area in zebrafish (Front Neural Circuits, 2013; 7: 67) (CNI-405nm and 457nm)

(6) Fatal Neurological Respiratory Insufficiency Is Common Among Viral Encephalitides (Oxford Journals, 2013:208) (CNI-470nm)

(7) Temperature-dependent Activation of Neurons by Continuous Near-infrared Laser (Cell Biochemistry and Biophysics,vol.53, 33-42,2009) (CNI-1064nm)

(8) Distal connectivity causes summation and division across mouse visual cortex (Nature Neuroscience, 2014,Volume:17,Pages 30–32) (CNI-473nm)

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