Internal Injector Deposits: A Scoping Study to Evaluate the Delphi Test Rig.

摘要

Shortly after the formation of a Deposit Panel within the CRC Diesel Performance Group, the EMA approached the Panel and requested initiation of an urgent effort to evaluate the causes of a new internal injector deposit problem. The panel diverted attention to this issue and formed three sub-panels: Data Analysis, Bench/Rig Investigation and Engine Investigation. The Bench/Rig Investigation sub panel identified two proposed rigs, evaluated them, and concluded that, neither, in their present state, could discriminate among deposit forming and not deposit forming fuels. Subsequently, another rig developed by Delphi was proposed for evaluation. This report provides a detailed description of the new rig and the results obtained from a scoping study using four fuels in a statistically designed matrix. Given that this is a scoping study, the effects of detergents additives (other than LMW PIBSI), biodiesel, and impurities were not included.