Bart Schreurs

Delphi Electronic Throttle Control Systems for Model Year 2000;Driver Features, System Security, and OEM Benefits. ETC for the Mass Market

Delphi has developed a second-generation Electronic Throttle Control system optimized for high volume applications. The Delphi system integrates several unique driver performance features, extensive security/ diagnostics, and provides significant benefits for the vehicle manufacturer. For Model Year 2000, the Delphi ETC system has been successfully implemented on several popular SUVs and passenger cars built and sold around the world. The ETC driver features, security systems, and manufacturer benefits are presented as implemented on these Model Year 2000 applications.

A Super Clean Diesel Vehicle for US LEV-III SULEV Category: Second Report; Advanced A/F Control for NOx Reduction and for SCR Heat Up

The objective for this research is to develop LEVIII SULEV technology for midsize passenger cars with SCR equipped diesel engines. The key for SULEV is to lower NOx over the whole emission cycle. From the engine control standpoint, this paper describes a unique NOx reduction technology with three-way conversion reaction until the SCR is heated up. Operating the engine at stoichiometric A/F allows a high conversion efficiency of both NOx and HC using a DOC. Furthermore, it allows rapid heat up of the SCR due to exothermal effect and reduced mass flow. The control system regulates the airflow in order to achieve stoichiometric A/F by controlling EGR flow as first priority. The amount of fuel is determined by the advanced torque control modelled by combustion efficiency so that the A/F can be controlled to stoichiometry maintaining driver requested torque. In combination with the unique SCR system, the FTP75 and US06 emissions test results for NOx + NMHC are below the proposed LEVIII SULEV regulation by a reasonable margin [1]. Stoichiometric mode is activated to control the NOx before the SCR is activated and when SCR efficiency is dropping at high exhaust flow; Stoichiometric mode supplement for lack of efficiency of SCR to achieve the LEV III targets. Fuel consumption penalty is minimized by a unique stoichiometric A/F control concept where AF target is achieved mostly with EGR control. The base structured engine control has advanced model-based functions such as air management with simultaneous control of VGT/EGR/throttle, torque structure, temperature and pressure estimator and precise A/F control, which are the main enablers to realize stoichiometric control.

A Super Clean Diesel Vehicle for us LEV III SULEV Category

A Diesel vehicle has higher potential for CO2 reduction than a gasoline vehicle. However, it was difficult for the diesel vehicle to become a global CO2 reduction method, because the diesel vehicle cannot meet strict emission legislation such as LEV III legislation in US. Therefore, this research aims to reduce emissions of diesel vehicle to SULEV levels by using a Urea-selective-catalytic-reduction (Urea-SCR) system and unique engine and management controls. In order to achieve SULEV in FTP75 and US06 modes, both HC and NOx should be reduced during the warming-up phase of the Urea-SCR system, and extremely high NOx conversion efficiency after the warming-up phase is needed. The heat-up control using unique multiple injection and the early usage of exhaust gas recirculation (EGR) are applied to the warming-up phase. The dosing control using an NH3 sensor is newly introduced to increase the NOx conversion efficiency of the Urea-SCR system. When the air–fuel ratio combustion gas is kept at stoichiometric air–fuel ratio, a diesel oxidation catalyst (DOC) can indicate the same three-way conversion effect as a three-way catalyst (TWC) of a gasoline vehicle. The combination of the engine-out NOx reduction by massive EGR, the three-way conversion effect of the DOC and the NOx conversion effect of the Urea-SCR system is used during the warming-up phase in FTP75 and during acceleration phases in US06. This emission strategy was able to dramatically reduce NMHC and NOx emissions in FTP75 and in US06, and achieved the reduction in the emissions below LEV III SULEV category’s required levels.