Browse Topic: Compressors
With the advent of electric and hybrid drivetrain in the commercial vehicle industry, electrically driven reciprocating compressors have gained widespread prominence. This compressor provides compressed air for key vehicle systems such as brakes, suspension systems and other auxiliary applications. To be a market leader, such an E-compressor needs to meet a myriad of design requirements. This includes meeting the performance by supplying air at required pressure and flow rate, durability requirements and having a compact design while maintaining cost competitiveness. The reed valve in such a compressor is a vital component, whose design is critical to meet the aforementioned requirements. The reed valves design has several key parameters such as the stiffness, natural frequency, equivalent mass, and lift distance which must be optimized. This reed valve also needs to open and close rapidly in response to the compressor operating speed. Since it is the order of milliseconds, the valve
In automotive air conditioning systems, compressor is used to convert low pressure low temperature refrigerant into high pressure high temperature refrigerant. Various types of compressors like swash plate, rotary vane, scroll etc. are widely used in the automotive industry for air conditioning applications. In rotary vane compressors, thermal protector is used as a safety device, designed to prevent the compressor from overheating during refrigerant compression process. When the discharge temperature exceeds the preset limit of thermal protector, the thermal protector will activate and stop the electrical supply to compressor clutch to stop the compressor operation thereby preventing potential damage to air conditioning system, engine, and other nearby parts of the vehicle. This technical paper explores the various real-world scenarios for a hot country like India, which may result into higher discharge temperatures of compressor resulting into activation of thermal protector. The
Customers expect more advanced features and comfort in electric vehicles. It is challenging for NVH engineers to reduce the vibration levels to a great extent in the vehicle without adding cost and weight. This paper focuses on reducing the tactile vibration in electric vehicle when AC is switched ON. Vibration levels were not acceptable and modulating in nature on the test vehicle. Electric compressor is used for cabin cooling and battery cooling in the vehicle. Compressor is connected to body with the help of isolators. Depending upon cooling load, the compressor operates between 1000 rpm and 8000 rpm. The 1st order vibration of compressor was dominant on tactile locations at all the compressor speeds. Vibration levels on steering wheel were improved by 10 dB on reducing the dynamic stiffness of isolators. To reduce the transfer of compressor vibration further, isolators are provided on HVAC line connection on body and mufflers are provided in suction and discharge line. With the
This SAE Recommended Practice is intended to describe a procedure for rating the size of single-stage reciprocating air compressors. It describes the conditions that can be used for testing and it defines a standardized rating expressed in SLPM (SCFM
The supplier is committed to all facets of the H2 economy as volume production of its power module kicks off for Nikola's Class 8 fuel-cell truck. At its oldest and largest location - a site long accustomed to manufacturing parts for combustion engines - Bosch is now producing what it calls the most complex system it has ever developed: a fuel-cell power module (FCPM). Production at the Stuttgart-Feuerbach site in Germany officially kicked off in July during a Bosch Tech Day event attended by global media. The pilot customer for the FCPMs is Nikola with its Tre hydrogen fuel-cell electric truck, which is expected to launch in North America in the third quarter of 2023. Bosch is committed to all facets of the hydrogen value chain, from developing an electrolysis stack and components for electrolyzers for H2 production, to engineering a drive solution for hydrogen compressors in filling stations. The supplier plans to invest nearly $2.6 billion between 2021 to 2026 in the development and
This SAE Recommended Practice establishes uniform Installation Parameters for desiccant Air Dryers for vehicles with compressed air systems
The testing techniques outlined in this SAE Recommended Practice were developed as part of an overall program tor testing and evaluating fuel consumption of heavy duty trucks and buses. The technique outlined in this document provides a general description of the type of equipment and facility which is necessary to determine the power consumption of these engine-driven components. It is recommended that the specific operating conditions suggested throughout the test be carefully reviewed on the basis of actual data obtained on the specific vehicle operation. If specific vehicle application is not known, see SAE J1343
Air Supply Unit (ASU) serves as the pneumatic source for the air suspension system in the passenger car segment. The ASU is an electrically driven oil-free compressor with integrated air dryer to deliver dry air to the suspension system. Solenoid valve, Height Sensor and ECU adjusts the pressure in bellow based on the vehicle load condition. During the lab test, pressure was not building up in the compressor due to delivery valve failure. The type of valve in asu is reed valve type, it is mostly used in the micro compressors due to its low cost, simple structure and light weight configuration. The reed movement is based on the pressure difference between the inlet and the compression chamber. Failure analysis is carried out based on the finite element analysis to identify the root cause, the root cause identified is optimized to prevent the failure. An accelerated test condition is arrived based on the FEA and a tailored series of accelerated tests are carried out to reproduce the
Less weight, structural integrity, good dynamic behavior, material selection, performance & energy consumption are important parameters while designing A/C components for EV applications. Structural integrity and dynamic behavior of these components is predicted by conducting dynamic analysis of A/C unit under standard vibration load test conditions. Material selection is another important point while designing A/C and simulation helps designer for proper material selection at initial design stage. Achieving required cooling capacity with less compressor power is another important factor while designing A/C unit and this is done by proper design changes on condenser and evaporator side with proper compressor selection. For this, CFD analysis helps to predict the air flow accurately with the given design parameters. In this paper, information about both CAE & CFD analysis performed effectively for improvement of unit is provided.CAE analysis is performed to check strength of unit as per
It is a known fact that the existing compressor stations on the sorting humps of the railways have significant overconsumption of electricity. First, this is due to the lack of automatic regulation of the compressed air capacity, which takes into account the technological processes at the station and the weather conditions within this section. In order to solve this problem, as a first approximation, it is necessary to analyze all the factors affecting the energy consumption of the compressor station and develop a mathematical model, which will link these indicators. In this work, a correlation analysis of the weather-related factors and specifics of the technological process (breaking up of the train), which affect the energy consumption of the compressor unit (CU), is carried out. Based on the analysis, there was a strong correlation between the factors described and the power consumption at the station. A regression model was developed. The issue of the distribution of energy levels
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