Last post on Jul 03, 2013 at 11:07 PM
You are in the Toyota Camry Hybrid
What is this discussion about?
Toyota Camry Hybrid, Hybrid Cars, Sedan
#76 of 148 Re: Dead battery woes in my 2007 Camry Hybrid & Toyota Service [droid13]
Oct 24, 2006 (10:52 am)
Then DROID13, there must be two DC/DC converters.
1. The high voltage Totem pole Up/Down converter which raises the HV battery pack voltage to the main HV bus up to 650v max. from its low of 244volts while accelerating ( something to do with maintaining volts/Hz)with MG2. And then while decelerating must lower the HV bus voltage to the HV battery pack voltage to enable it to absorb the recaptured energy.
And then there must be this other converter that gillesmtl was referring to earlier.
2. A bidirectional converter which allows power to be exchanged between the 12 volt accessory battery and the HV battery pack. This must be about the schematic I saw on the ANL goverment site which shows how the galvanic seperation for the two battery systems is attained. Until now I didn't know which car this was intended for. I'm pretty sure the Gen 1 Prius does not have this. Anyway for those interested they use two H-bridges connected via a high frequency step up transformer. Obviously only one bridge can be enabled at any one time.
So the sequence must be that during boosting of a discharged 12volt system, the low voltage H-bridge must turn on thus charging the HV pack which in turn precharges the HV bus enabling MG1 and it's inverter to start the engine.
Though it does sound dumb that any drain on the 12volt will cause a domino effect to the loss of the HV battery as well. This is a repeat of the old adage "computers are dumber than people but smarter than programmers" !
And then you have to hit the START switch to shutdown properly. Now who else in their right mind would expect you to do a thing like that. Alright, who else besides Bill Gates then ?
#77 of 148 12 volt battery goes dead fast--a design feature?
Jan 03, 2007 (10:28 am)
Got my camry hybrid end of Nov 2006--drove it home, did not drive for 2 days--next day it would not start. Jump started took to dealer--they said 12 volt battery was depleted (probably while in lot)--recharged. Okay for 2 weeks--then went away for 7 days--came back battery dead-jump started, drove a day a few short trips. Next day battery dead--jump started, and charged it for several hours. Now on 4th day of successful starting. The manual says battery depletes after 14 days of non use--to go after 7 days seems excessive. My old 1994 camry went two months without being used and started just fine. Frankly if this is the intended design of the car it is not a good second car or a good car for people who frequently travel. Is this supposed to happen or do I have a bad battery? At this rate the car will have to be plugged in all the time.
#78 of 148 Re: 12 volt battery goes dead fast--a design feature? [hybridnewby]
Jan 03, 2007 (2:44 pm)
Sounds like you have a bad battery. We went to Japan for 10 days and had no problem starting the car after that.
#79 of 148 Re: 12 volt battery goes dead fast--a design feature? [dogzen]
Jan 05, 2007 (3:38 pm)
Bad battery sounds like a good suspicion, I hope this is it and I really do not have to jump start it every few days--hopefully my dealer will agree to replace it. So far when people ask me how I like my camry hybrid I tell them it is great except for the fact it is useless for people who travel alot leaving their car at home.
#80 of 148 Re: 12 volt battery goes dead fast--a design feature? [hybridnewby]
Jan 12, 2008 (7:54 pm)
I actually have a regular (non-Hybrid) 2007 Camry LE and I went on vacation for two weeks. When I came back the battery was drained. I always turn off my headlights and if I don't the car automatically turns them off after half an hour. My car was definitely off (I don't have the fancy keyless driving feature) and all the doors were shut properly so the cabin light was off (which also turns off automatically after a while). When I called Boch Toyota they said that new cars weren't meant to be left alone for too long and that it was normal for the battery to discharge if left alone for 3 to 4 days; the cars have to be started every three days. Sounds like a hassle to me... might have been better off buying an old used car.
#81 of 148 Re: 12 volt battery goes dead fast--a design feature? [takenforaride]
Jan 12, 2008 (8:36 pm)
>>>When I called Boch Toyota they said . . . . . that it was normal for the battery to discharge if left alone for 3 to 4 days; the cars have to be started every three days.
It's hard to believe any dealer would say something so foolish. It's nonsense. If true, millions of cars left at home while families go on vacations--by plane or another car--would return to find all their car batteries dead. Needless to say, this isn't happening.
Your problem was likely caused by a defective battery, or an electrical drain of some kind, or possibly your battery was at low charge when you left for some other reason.
#82 of 148 Re: 12 volt battery goes dead fast--a design feature? [takenforaride]
Jan 14, 2008 (8:40 am)
Is that Boch Toyota in Mass.? Anyway, that is a typical "BRUSH THIS GUY OFF" answer. The least that should be done is a check for power drain, and a check of the battery itself. If it were me, I would be at the service desk, looking for the servive manager, armed with the itiotic answer I got from one of his employes, and wanting to know what he was going to do about it. JMHO.
#83 of 148 Re: 12 volt battery goes dead fast--a design feature? [acco20]
Jan 14, 2008 (1:48 pm)
Sory ebout the bed spalling in my lest past................LOL
#84 of 148 Re: 12 volt battery goes dead fast--a design feature? [acco20]
Jan 14, 2008 (7:37 pm)
I agree NO car should be drained down after a month sitting. I have had PU trucks that I left for six months and cranked right up. I would be thumpin' on some heads at a dealership that tried to pull that kind of shenanigans. The Hybrids do have that severe flaw that they will drain down the battery after a couple weeks. I guess Toyota does not know how to design a battery cutoff circuit.
#85 of 148 Re: 12 volt battery goes dead fast--a design feature? [gagrice]
Jan 15, 2008 (1:56 pm)
"I agree NO car should be drained down after a month sitting. I have had PU trucks that I left for six months and cranked right up. "
Odd this should come up; I just saw an article on how new cars need to be run more often because some of their electronics have a small current draw. Apparently it is due to the way the auto companies are designing their computer subsystems.
Most older cars are not affected because their electronics do not draw current unless the car ignition is on.
Sorry, I can't remember where I saw the story, it was either on excite or reuters sites.