COMMENT: ‘Cycle beating’ – we’ve been here before

Seasoned observers of truck and bus powertrain technology will get a feeling of déja vu as they read about the emissions scandal affecting Volkswagen. Back in the 1990s, the practice of 'cycle beating' was prevalent in the heavy-duty diesel sector. In 1998, all truck engine makers then in the North American market - Cummins, Detroit Diesel, Caterpillar, Mack, Navistar, Volvo and Renault - were found guilty of manipulating emission rules and were heavily fined.