I've been playing around with the idea of building a hybrid electric vehicle. I want to take a VW Rabbit, put an electric motor in it, a 72V battery bank (6x), and a power generation system. The latter is what I need help with. BTW, I'm a software engineer and tend to come up with complicated solutions, and haven't played with electronics since I was 13.) Ideally, I want a black-box system which does the following...
- When the battery bank voltage drops to a certain point, the 'generator' is started.
- a. The 'generator' will be a small gas or diesel engine running a DC generator.
- b. The generator will have a dumb electric start system, so when it needs to be started, 12V (from an aux battery) needs to go to the starter for a fixed time period (2 or 3 seconds maybe.)
- c. After the engine has reached its running RPM, the DC generator needs to be connected to it's load (the battery bank.)
- When the battery bank voltage reaches a certain point, the generator needs to be shut down.
- a. First, the load must be disconnected.
- b. Second, the engine must be shut down. Let's assume a gas engine, because it's simple to shut down a small gas engine. We can short the coil to ground for approximately five seconds.
So, if I haven't forgotten anything, we end up with a pretty small loop of fairly simple tasks. The problem is that I have no idea if this can be done with simple electronic components, or where to start. I also need to come up with a charging method, to convert my 30V DC to 72-86V DC to charge the battery bank. The PWM charger as documented by Virgis looks very interesting, as does the DC-to-DC capacitive charge transfer system as documented by charged. I'm going for efficiency. BTW, the generator is spec'd at 9000W.
I would appreciate any input you can give me. Thanks.
brian |
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