Hybrid battery temperature and fan speed (Hybrid Assistant)

excellent

 

I feel your pain, because I cannot enjoy my car because of this. The place where I live has many ups and downs and the weather is very hot, so the battery temp flies to 45C after 3-4 hard braking or after driving downhill. There's nothing I can do except to turn the fan to the highest and leave it like that (Dr. Prius app). The software for the cooling system is crap. It should spin the fan faster and start to spin it sooner. I don't know what is the science behind this.
I would pay a lot of money just to be able to change the fan settings: 1 speed when the temp is 27, 2 speed when the temp is 29, 3 speed when the temp is 33, 4 speed when the temp is 37...
Leaving the fan to keep the battery around 38 (with Dr. Prius) helps and the car ban be driven without going to semi limp mode.

 

If the battery is good it won't overheat with programmed fan speeds.

 

hard to believe there are big enough mountains in the u/k to create a regen problem

 

It will, every single day.

 

Is the UK not a bunch of rocks jutting up from the sea?

Does the battery blower in gen 4 speak CAN? In gen 3 it's just given a PWM signal to control its speed, and outputs a voltage related to the speed as feedback. A spoofer could be a simpler project than intercepting CAN.

 

It should not - indicating a bad hybrid battery excessively heating under load.

 

i suppose if you came down this every day:cairnwell_pass

 

(don't have car yet)

Where is the exhaust of the cooling system?

 

this is a gen 4 forum

 

Can't I ask a question?
So, where are the exhaust vents on a 4?

 

you can ask anything you like, but you're more likely to get a correct answer for your car in a gen 5 forum.
but maybe i was mistaken, and you wanted gen 4 info. my apologies if that is the case

 

The cars aren't similar?
The new plug ins are liquid cooled, no?
I am getting an HEV, so air cooled.
I imagine the two air cooled systems are somewhat similar.
So, are you going to answer the damn question, or just give me more grief?
Perhaps there's a solution in there somewhere to your gen 4 plug in problem.

 

me?

 

I give up. Later dude.

 

Gens 1 through 3 have all had similar battery-cooling airflow, where conditioned cabin air passes through a grille near the back seat, and is passed through the battery, and exits the car at rear-quarter one-way vents that are concealed by the rear bumper cover.

In other words, the battery is just part of the normal path of the cabin flow-through ventilation (with the attendant benefit that the natural flow-through ventilation is always cooling it somewhat, even without extra work from the battery cooling blower. (Or you could think of it the other way, and say the battery cooling blower increases the cabin airflow.)

One complication of the scheme is that when you choose recirc rather than fresh as the HVAC air source, it reduces the battery airflow. To counter that, the battery ECU (or power management control ECU, depending on generation) actually gets a veto over recirc. If it wants more air, the inlet changes to fresh. (I don't think it actually changes your visible fresh/recirc control panel setting; it just quietly does what it needs anyway.)