Quote:
Originally Posted by Christ
For instance, if I can ever find the reference (I'm terrible at bookmarking anything I read, if you can't tell), there were a couple air-throttled diesel compression ignition engines back in the 40's, maybe 50's (?).
They used a throttle and had a vacuum fuel control on the IP, but were still compression ignition. My guess (I don't know anything about them) is that they were either unreliable, or unrealistic (in terms of fuel use/power/etc.), and didn't have an expert marketing team backing them up like Soccer Mom's and SUV's.
|
I must admit I have worked on a few air "throttled" diesels.
1) friends 80's Benz 5 cylinder Diesel with Vacuum operated EVERYTHING. would close a throttle valve (firmly) when you put your foot on the brake, and be spring loaded at (all?) times to generate vacuum. Why they didn't have a vac pump I have no idea. When you tied the thing open the car got much faster, but nothing worked.
2) Anything in the oil field has a "rig saver" on it. Basically a throttle valve that closes automatically when the engine over revs, or an operator forces shut down. Issue is that flammable gas can easily be released in range of the engine causing an unintentional over throttle situation and Run-Away which can very easily create an ignition source for the flammable gas floating around. All of these I have seen are only on/ off and have to be reset manually.
3) My Golf Has an "Anti Shudder" valve that closes when the key is turned off (maybe other times as well?).
4) I **THINK** that newer "clean" diesels have a throttle valve to keep the Air Fuel Ratio in some range. (no evidence/ sources here at the moment)