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军事

The pulse width modulated duty cycle signal

2021年12月7日

几年前, when vehicles using these compressors were just starting to show up at shops for service with some regularity, we were searching to find some detailed information about their behavior to use in clinics.  There was not a lot of it available, so we borrowed several vehicles and did some videos.  The following are some clinic slides produced from one of those videos.
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Diagnosing electronically controlled compressors

2021年11月30日

When preparing to conduct diagnostics on a system using an electronically controlled variable displacement compressor, the diagnostic process needs to focus on four areas.
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Exploring electronically controlled variable displacement compressors

2021年11月23日

Electronically controlled variable displacement compressors (ECVDs) have been in use now for over 15 years.  然而, there are a lot of technicians in the field who have very little knowledge about them and their operation.
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Electronically controlled variable displacement compressors

2021年11月16日,

what if" this system used an electronically controlled variable displacement compressor instead of the pressure controlled variable displacement compressor?   What would the results be?
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Meet MACS member, Tom Lech

2021年11月8日

Stationed in San Francisco, 加州, Thomas Lech has maintained a bustling business for almost three decades. Lech Auto Air Conditioning has been busy for 365 days a year from opening at 7 a.m. 到7点收市.m. for the last 27 years, with summertime only increasing the demand for the shop’s services.
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What do you know about the fixed displacement piston compressor?

2021年的11月2日

What do you know about the fixed displacement piston compressor? 
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J1587/J1708 and J1939 data line diagnostics

2021年10月27日

Modern heavy-duty equipment is basically comprised of computers with operating units attached. 简而言之, it is a multiplexing system that replaces traditional power distribution devices with ECUs that communicate electronically over the vehicle datalink.
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The concept of superheat

2021年10月19日

We illustrated the concept of superheat in last week's article by boiling water and superheating steam in a moonshine still. This week we will apply this concept to refrigerant in an air conditioning system.  The still has been replaced with an evaporator. 
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Understanding and troubleshooting data lines on heavy-duty trucks

2021年9月23日

Understanding and Troubleshooting data lines on heavy-duty trucks will be presented byLarry Turay of LETCO Enterprises. In Larry’s Saturday morning class, attendees will learn how components and subsystem inputs and outputs can influence HVAC operations. 
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AEM Update: Snap application for off-highway R-1234yf

2021年9月22日

MACS will have a variety of heavy-duty and off-road presenters beginning at 8 am on Thursday, 9月30日.  One will be AEM Update: Snap application for Off-highway R-1234yf
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