/ Emissions Standards
The need for regulations
The 1990 Clean Air Act gave the EPA authority to regulate non-road emissions, and required the EPA to begin a study of the emissions from non-road engines. At the completion of the study, the EPA concluded that non-road engines are a significant contributor to ozone and/or carbon monoxide non-attainment, and proceeded to develop emissions standards for most categories of these engines. The EPA’s first step to reducing non-road emissions was known as Tier 1, and its primary goal was to immediately reduce oxides of nitrogen (NOx) while making a minimal impact on the machine. Before Tier 1 was fully implemented, development started on the next rounds of regulations.
The European Union has established similar emissions regulations in several steps, which are referred to as stages. John Deere is well positioned to meet all these regulations.
EPA Tier 3 emissions regulations are now being phased in for non-road equipment, as shown in the EPA and EU Non-Road Emissions Regulations chart on page 2. This means emissions of NOx (oxides of nitrogen) must be reduced by at least 40%.
Achieving the proper balance.
The following keep PM at acceptable levels:
- Electronic unit injector (EUI) and high-pressure common rail (HPCR) fuel systems are used to increase fuel injection pressure
- Valve guide seals and new piston ring design for reduced oil consumption
- New turbocharger designs to control transient smoke
- Improved combustion bowl to maximize air/fuel mixing and optimize the combustion process, reducing the amount of emissions