Yes, they do exist. However, not as a part-time student. This works if you have a lot of energy, and you prioritize your engineering over all other aspects of life. Basically, if you can get a fellowship to pay for your PhD and get an office at school, then reduce your hours at work to 30 - 40 (assuming as a working engineer you are probably putting in more). Then make a schedule with basically two shifts between Monday morning and Saturday afternoon, filling every hour, so you can spend 45 - 50 hours a week at school and 30 at work + time for meals, transportation, errands, chatting, etc. If you discipline yourself to use 14 hours per day productively + 5 - 10 hours per weekend, you can make it work. You will need focused discipline and to have a body that does not require huge chunks of sleep or exercise. You have to get into a rhythm since this needs to be sustained for 5 - 7 years (with academic-year cycle breaks, thankfully). Having an office space at work and one at school help to divide your time/mindset, as well. Having your work project as your thesis topic will greatly enhance the chance of success, since you can double-dip into your hour allotments.
I do know someone who did this (at UCSD EE).