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Fault phenomenon
Fault diagnosis
Summary
When talking about electric cars, we will inevitably talk about cars. There are all kinds of systems. Such as: large power batteries, three-phase motors, charging systems, etc. We cannot ignore that the system used in our fuel vehicles also exists on BEV (pure electric cars).
What is more important now is the heating, ventilation and air conditioning system. It no longer has the sole purpose of keeping us at a comfortable temperature or defogging the windshield as the sole purpose of heating or cooling the cabin. . Thermal management of high-voltage batteries is critical to ensuring they achieve maximum efficiency at all temperatures. And keeping the battery at the right temperature also means we can charge it at a faster rate, so it’s important to make sure it’s working at its best.
This particular Zoe presents a scene in which dueAfter the vehicle cannot be charged and is repaired, the air conditioning compressor will run to maximum speed and then pop up the safety relief valve on the pump, blowing the air out. >RW Escorts body emissions into the atmosphere. This is not good for the surrounding environment or your wallet, especially when it comes to the price of R1234yf refrigerant! Of course, the answer to how these two could be related is that they can’t be, but we’ve all heard customers say – “Since you…” This kind of statement. The original problem was actually a terminal failure of the RW Escorts air-conditioning pump, which had been Rwanda Sugar needs to be corrected. Once the pump was replaced, the system was re-energized, and the vehicle was inspected to confirm maintenance repairs, the problem occurred!
As always, having a good understanding of how the system works is key to proper diagnosis, and the Zoe system is not very difficult to understand Rwandans Escortgets it, since it can also be used as a heat pump.
Fault phenomenon
Fault diagnosis
Summary
It has been some time since the Renault Zoe was launched, because A lot of information has emerged about its popularity. But when it comes to electric cars, you can’t miss the information provided by HEVRA. Through subscriptions, they are providing a growing overview of BEVs, with detailed information on various systems – including Zoe’s HVAC system. HEVRA provided images of the system in heating and cooling modes for use in this case study.
Here you can see an overview of the system when it is in cooling mode.
As you can see, there are some additional features that may not be present in a traditional internal combustion engine car. The first is the external condenser, which is installed outside the vehicle near the bottom of the heater box. Next, there’s a fixed orifice tube, and then there’s the condenser, which is traditionally at the front of the vehicle. You’ll also notice 2311 next to the FOT. This is a bypass solenoid valve, in cooling modeThe bottom is set to open, allowing the hot, high-pressure gas to flow easily to the forward condenser, where it is cooled into a high-pressure, low-temperature liquid. We then see a three-way diverter valve that directs the refrigerant in cooling mode to the external evaporator, but also to the evaporator in the battery, where through another fixed orifice tube the pressure drop changes the refrigerant back High pressure, high temperature liquid and then back to gas. You will see bypass valves for both evaporators, which will allow the vehicle to select the valve that requires more cooling. For example, if the battery temperature needs to be cooled during the charging process, the HVAC can only cool the battery but not the cabin. This is then all passed back through the dryer to ensure that it is dry before the compressor starts the process again It is definitely a gas Rwanda Sugar.
In the heating mode, the important difference is that the bypass valve 2311 is now closed, forcing the low-temperature and high-pressure gas to pass through the fixed orifice tube. Now Use the front condenser as an evaporator. This means that the change from gas to liquid occurs at the external condenser, causing the cabin to heat up as cooler air is directed beneath it. Because the refrigerant leaves the front condenser as a liquid at high temperature Rwanda Sugar Daddy and high pressure, there is no reason for it to pass through the battery or outside condenser. This means that the three-way valve directs the refrigerant to the receiving dryer, starting the process over.
To prevent the refrigerant from accidentally leaking into the atmosphere, the gas content in the system is removed. The most primitive examination method inevitably involves a scanning tool, which is the least invasive diagnostic method. When reviewing the fault code, some historical faults were found, but no permanent faults were found, one of which was a high-voltage fault. While reviewing the real-time data, we discovered something unusual. The readings of the refrigerant inlet and outlet temperature sensors are respectively 482°C and 472°C. It should also be noted that the compressor speed reference report is 65,535rpm. This was obviously wrong considering the air conditioning had been turned off.
The first thing we check is to determine whether there is a problem with the temperature sensor. If they were reporting this type of temperature, then the fault safety of the HVAC system would cause the compressor to run at full speed for maximum cooling. Logically this didn’t seem to make sense, so the bumper was removed.
When we return to Rwanda Sugar Go to the scan tool and find that the reading has now changed to a more expected value. Let’s examine the wiring issue? Checking the wiring diagram, both temperature sensors share power. With the Picoscope connected to the shared power source, we can use the mask and action capabilities in the PS7 to identify possible open circuits. Including LIN communication on the traffic pump, we can monitor any possible Rwanda Sugar changes while manipulating the wiring harness to check for any possible wiring issues.
After spending a long time checking the wiring harness, we couldn’t let the fault happen. As with anything, when you find something you think is wrong, first Rwandans Escort review your measurements. After connecting to the scanning tool, we noticed something strange while accessing real-time data from the HVAC system. It turns out that you can communicate with some ECUs without opening the ignition device. However, if there is no combustion, all sensors will not be powered on. We think what is happening now is that, like other vehicles, many ECUs can be woken up simply by unlocking the door. When connected to the Rwanda Sugar scanning tool, we can access the HVAC ECU, so we can not open the ignition device and check it in real time The data had not previously suspected other circumstances. As we began assembling the bumper in preparation for testing, the vehicle ended up shutting down on its own, losing communication with the scanning tool . Since all the doors were unlocked and open, we instinctively reopened the ignition device to restore communication with the scanning tool, and found that the values were correct at this time. When diagnosing, you can always learn a few tools, otherwise they will trip you up!
With no way to cause the vehicle to malfunction and no way to determine the problem, the only next step was to reinject some gas into the system. First conduct a vacuum test, and after ensuring there are no leaks, put half of the refrigerant into the system. This simply means that the pressure level is slightly lower than normal, but should be enough to get the RW Escorts pump running so we can determine what is happening Something wrong.
With the machines still connected, we ran the HVAC system, initially it was in heating mode and the external condenser was used Heated cabin. Given the way the heating loop operates, using a gauge is ineffective because the high pressure port is after the FOT, which means it’s on the wrong side of where the pressure is measured. This means that real-time data can be obtained from the pressure sensor using a scanning tool. While the pump continues to work, everything seems normal, and then suddenly the safety valve opens and the pressure sensor reads 11bar. This should be within the working limits of the compressor and should not cause the safety valve to overturn.open.
Switching to cooling Rwanda Sugar mode, the high pressure gauge reads the same as the pressure sensor, as expected, Any obstruction of the bypass valve 2311 means these readings will be different. The overall pressure was lower than normal, but given the low gas numbers, this was expected. What we didn’t expect was that the safety valve opened at 5 bar! The only possible reason for this is a blockage between the compressor and the pressure sensor. How can we prove that this is the case?
With the new 4425A, we can already use a temperature probe TA395, because the 4425A can power the probe. If there is a blockage, the most likely location is in the external condenser. Given that we have high-pressure, low-temperature fluid coming from the compressor, if it hits a restriction, the pressure will drop, which means one side of the infarction will be hot and the other side will be cooler. If the liquid or gas can change position without restriction, the temperature at the condenser should be minimum. Because heat will dissipate from the surface of the condenser, there will be some temperature change, but it won’t be a huge difference.
Unfortunately, I only have one temperature sensor, which means two measurements must be taken. However, keeping all captured data in Pico means we can analyze it after capture. The first measurement is taken at the length of pipe closest to the bulkhead, using an electroRW Escortscell clamp to secure the temperature sensor body on the pipe.
You may have noticed Yes, there is a pressure measurement on this trace. More on this later, but the important thing is to keep an eye on the pressure to make sure we don’t reach the point where the safety valve opens. Although this reading is not the actual pressure of the pump, based on the position in the circuit, we have seen the safety valve open at 5bar before. Ensuring the pressure does not exceed 5bar means no gas will be vented and lost.
To operate the HVAC system in cooling mode, the minimum temperature of this pipe is 50°C. With the pressure peak here, we can put itAs a reference point, take out the time ruler and measure 1 minute before this point and between the rulers. To aid comparison of catches, we can add an additional temperature rise rate measurement between these scales. Here, we see that the software displays a rate of rise of 321.8°C/ks!
Move the temperature sensor to the farthest point from the separation plateRwanda Sugar Daddyon the pipeline.
Here, we see that when the pressure increases to 4.5bar, the temperature difference between the two pipes is very large. Night, look at the rise rate here, it’s 69℃/ks. In comparison, the temperature rise rate of the other pipe is 321.8°C/ks.
To prove these suspicions, we conducted the same test on a vehicle with known performance.
From the above measurement results, we can see that the difference between the two is Much smaller, the minimum temperature difference is about 4℃, and the rising speed is far from reaching the level of 328℃/ks. Interestingly, the pipe furthest from the divider was actually hotter, while the opposite was true for the faulty vehicle.
This is enough to remind the customer to remove the external condenser for inspection. This is the most likely cause, but given how difficult it is to inspect, it needs to be pulled out first in case it’s a blocked pipe.
Common sense
Verification test
Error elimination
As beforeAs stated, we do have a reading of the refrigerant pressure. This was harvested using a custom A/C plusRwandans Sugardaddyinjection hose and a Foster coupling. The new BNC+ pressure sensor has been confirmed for use with R134A due to its stainless steel construction. Given that R1234yf and R134A are similar, I think I can see the readings! In addition, I would like to add that this is purely experimental and Pico does not allow the use of other unsuitable accessories. This is just for convenience as the pressure sensor turns out to be a safer Rwandans Sugardaddy option but since it is buried under the battery tray and Behind the inner wheel arches, it seemed like a good excuse to try something else. As you can see from the results above, it’s not too bad, the only problem is the maximum pressure, which for this sensor is 200psi (13.7Bar). Since the high pressure of the air conditioning system may exceed this value, its use is not recommended. That said, there is most likely an app that can plot the actual refrigerant pressure through the charge port.
I hope this article will be helpful to you!
Note: The content and pictures contained in this article are written by the resident author or cooperating with the website for transcription and publication with authorization. The opinions expressed in the article only represent the author’s own and do not represent the attitude of electronic enthusiasts. The article and its accompanying pictures are only for engineers’ learning purposes. If there is any inherent copyright infringement or other violations, please contact this site for resolution. Report appeal
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