Engine valve actuator cylinder deactivation technology
|School||Nanjing University of Technology and Engineering|
|Keywords||Gasoline Engine Cylinder Deactivation Electro-Magnetic Actuated Valvetrain Sequential Skip-cycle Cylinder Deactivation Energy Conservation|
Cylinder deactivation could solve the contradiction between engine power and fuel economic, and reduce harmful emissions effectively, is a new technology which has an important researched-significance. This dissertation focus on the control scheme of variable ratios of cylinder deactivation and control strategy of cylinder deactivation, the following research works were carried out:1) The novel Moving Coil Electro-Magnetic Actuator Valvetrain(MC-EMAV) developed by writer’s team was introduced, was proved its feasibility as the cylinder deactivation actuation through experiment. The model of cylinder deactivation engine which was build by AVL BOOST could realize the numerical simulation of its output characteristic.2) The working process of a single cylinder stopping one work cycle was researched. To ensure the pressure in the cylinder in cylinder deactivation cycle was not less than 0.3bar and the loss of indicated work of stopping one working cycle was small, starting point of single cylinder to stop one cycle was determined to be the time when exhaust valve has been on 110℃A, at the same time an optimization program was proposed that in the next cycle the exhaust valve was delayed to open about 110℃A.3) Aimed at the problem which cylinder deactivation in traditional way caused cylinder eccentric wear and fierce temperature variations, the control scheme of sequential skip-cycle cylinder deactivation was presented, and through varying ratios of cylinder deactivation designed four kinds of cylinder deactivation working mode.4) Research showed that, compared with conventional engine, application of technology of cylinder deactivation can improves the economy of engine by 20% or more. In the principle of economy, through comparison of equivalent specific fuel consumption curve of different ratios of cylinder deactivation working modes, cylinder deactivation work area MAP diagram was obtained, it can provide the necessary basic data for future development and design of the prototype.5) The control strategy of cylinder deactivation was studied preliminarily. The components and control flow chart of cylinder deactivation control module were designed.