We Need Some Diesel Common Sense
Friday, 4. May 2018
I have to say that I’m not a big fan of President Trump and when he was constantly moaning about False News I thought he was being paranoid but reading all the nonsense printed and reported about diesel cars I can understand what he means.
I’m not going to deny that petrol and diesel cars are not good for the environment but the difference between the two is minimal. Petrol pushes out more CO2 whilst Diesel pushes out more NOX. Diesels also had a problem with particulates but used properly a new Euro 6 diesel emits no particulates at all.
I was speaking to an MOT tester and even 3-year-old cars often emit zero particulates when MOT tested. My view is that by raising diesel emissions as a major problem, mayor Khan and many local authorities are using the scare tactics to impose more penalties on those driving all diesels and not just the old models.
Ford have already said that they are committed to diesel cars and others are taking a similar line but we could be looking at a totally different playing field in 2 years time. Bosche have developed a new system that will reduce NOX emissions to just 13mg/km.
That’s about a tenth of the limit set to be the level required in 2020 under the next set of regulations known as RDE2. In technical terms, Bosche has moved the Selective Catalytic Reduction (SCR) System and the Diesel Particulate Filter (DPF) closer to the engine, allowing them to operate at optimal temperatures.
A faster-spooling turbo is fitted to improve operating efficiencies and the exhaust gas re-circulating system is modified to keep hot air pointed at emissions reduction components. The set-up also includes improvements to the fuel injection, Adblue dosing equipment and engine management software, while the development car’s engine capacity was reduced from 2.0 litres to 1.7 litres without loss of power.
When testing Bosch found the worst case scenario was driving around town when their car, a VW Golf, recorded a maximum NOx emission of 26mg/km because in very cold conditions the car struggled to get up to full operating temperature.
Fuel and AdBlue consumption remained the same although technicians said that in very cold congested conditions fuel consumption could increase by between 3% and 5%. Whilst the equipment cannot be retrofitted to older diesels it is available for manufacturers to order now. But the hardware changes needed mean the complete system is unlikely to be integrated into production lines for another two years. Excellent news for us supporters of diesel! By Graham Hill
