EV Mode Unavailable in 110°+ Ambient Temperature

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Jul 28, 2022 | 05:34 AM

#16

bclexus

Thread Starter

Lexus Champion

Joined: Nov 2014

Posts: 13,614

Likes: 2,920

From: Texas

Quote:

Originally Posted by Im2bz2p345

Just to clarify, the Lexus GSh uses an electric compressor. There is high voltage from the batteries that go to a 3 phase inverter, which modulates voltage to control the speed of the A/C motor.

Toyota and Lexus hybrids vehicles can run when the ICE is completely off (you can witness yourself if you're still in traffic/going through a car wash/etc where your batteries have adequate charge, the ICE will remain off yet you'll still get A/C air).

Here is an older PDF that describes how it worked on older Toyota and Lexus models: https://opensiuc.lib.siu.edu/cgi/vie...text=auto_pres

If you're rather watch a YouTube video, this is a lot more recent and covers the topic well: https://www.youtube.com/watch?v=7unan5rgPwY

Hope that helps,

~ im2bz2p345

Very interesting! I had no idea the electrically driven A/C scroll compressor is actually powered by the traction battery's DC high voltage that is converted to 3 phase AC voltage that can then easily be varied to control the speed of the compressor's motor. That makes sense considering the ECO drive mode can reduce or vary the compressor's speed by signals from the combination of the drive mode and the A/C system control. I guess the delay in the ICE starting in conjunction with the delay in the A/C starting is likely just an intended systems operation process. I'm glad there are intelligent automotive design engineers that can invent these types of things for us. Thanks for the information and video about it!

Literally!

Last edited by bclexus; Jul 28, 2022 at 01:37 PM. Reason: grammar

Aug 9, 2022 | 11:36 AM

#17

spineman

Pit Crew

Joined: Oct 2017

Posts: 205

Likes: 43

From: DE

Quote:

Originally Posted by Hues10

Somewhat related to the ICE turning over when I first start the car after it sitting overnight. I can shut off the engine with 5 or more bars showing, then in the morning in normal Florida temperatures of 80 degrees, the ICE starts whether I have the AC on or not. So the Hybrid battery is not too cold or warm, but yet the ICE will start. Now if I stop at a store and 20 minutes later start the car, the ICE does not kick in. So explain that my hybrid friends. I just took it as the Coolant and/or oil has to be at a certain temperature for the ICE not to kick in. Thanks.

Yes...I believe you are correct. If the engine is warm and the A/C is off, it has no need to start the ICE to warm up the engine, but it will always start the ICE if it not warmed up.