To my thinking, a big red Emergency stop switch tied to a Big hairy relay (BHR(tm)) to interrupt the battery cable is the way to go. This is not exactly a new concept. WWII vintage vehicles had a battery master switch on the dash.
Relays are trouble points too, don't forget. I think the traditional keyswitch _is_ all that is necessary if the hybrid's electric motor is brushless. All you have to kill is the power to the gate sequencer and that motor is _not_ going to turn.
(There would need to be some attention to failure-proofing the design, so that, say, a shorted collector-to-gate motor IGBT didn't back-feed power into the gate driver, which might make it to the driver board's Vcc via protection diodes or the like. Board could thus stay powered through the defective motor driver, and your fail-safe key switch isn't so fail-safe anymore. -- Jim _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
