James Dyson has claimed that Bosch are using in - built sensors in their line of vacuum cleaners to fool EU regulators into thinking they are more efficient than they actually are . According to The Telegraph , Sir James claimed " Bosch has installed control electronics into some of its machines to wrongfully increase energy consumption when in use – to cheat the EU energy label . Their scheme is akin to that seen in the Volkswagen Group . " Sensors built into the device allegedly instruct the motor to increase its energy use when the vacuum 's tank is full of dirt - unlikely in a test - bed . A spokesman for Dyson said that consumers frequently take energy rating labels into account before purchasing a new vacuum cleaner to save money on energy bills. Bosch responded to the allegations , saying that “ We do not understand these assertions by experts and we strenuously reject them ” . Dyson is taking legal action in Germany , Belgium and the Netherlands to challenge the energy efficiency ratings .
James Dyson has claimed that Bosch are using in - built sensors in their line of vacuum cleaners to fool EU regulators into thinking they are more efficient than they actually are . According to The Telegraph , Sir James claimed " Bosch has installed control electronics into some of its machines to wrongfully increase energy consumption when in use – to cheat the EU energy label . Their scheme is akin to that seen in the Volkswagen Group . " Sensors built into the device allegedly instruct the motor to increase its energy use when the vacuum 's tank is full of dirt - unlikely in a test - bed . Bosch responded to the allegations , saying that “ We do not understand these assertions by experts and we strenuously reject them ” . Dyson is taking legal action in Germany , Belgium and the Netherlands to challenge the energy efficiency ratings .