These were all filed around the same time in the late 80's and early 90's, it looks like there was probably a big patent rush for ignition timing control systems. (mechanics.stackexchange.com)
It's a racer's wish list come true, including innovative plasma - sprayed bores for reduced friction, lighter weight, enhanced cooling, power output, and fuel efficiency, while optimized individual ignition timing control for each cylinder and upgraded fuel pump improve combustion. (nissanusa.com)
New high - flow, large capacity turbochargers, which are used for GT3 racing, improve breathing, while optimised individual ignition timing control for each cylinder and upgraded fuel pump improve combustion. (motor-prime.com)