I did my undergraduate degree at NJIT in ME, and I thought that I got a decent amount of exposure to technical writing, especially in the form of lab reports. Although it may not be the same as design control documents in industry, you still need to use the same clear and concise writing style mentioned by neb2. It is not an easy skill to learn, especially since engineers tend to include too much detail. I have come across this in industry where a technical document that could have been very concise was written as a huge long report, with a lot of the content not being necessary for the target audience. Although I agree that it is beneficial to take classes that teach technical writing, as gp232@njit.edu mentioned, I think that the only way to master the skill is by a lot of practice and experience.