In my sunchoke patch, I'm using grass as a cover crop for no till purposes. Is this a bad idea?
That should be just fine in the off season (when you aren't growing anything), so long as you're aware of the grass' growth stages. You might not want wild grasses going to seed in your beds, or they may germinate there throughout the next season and create extra work. I'd get them cut before they go to seed.
Also, if it's a runner/stolon spreading perennial grass, such as Bermudagrass, I'd keep it away from the beds completely. They are often very competitive growers and will be a constant pain when you're trying to grow a crop.
And it's generally a poor idea to grow covers under a crop plant, as they will lower your yield.