Lou Z.D.,Jiangsu Gongda Power Technologies Ltd. |
Deng Q.,Jiangsu Gongda Power Technologies Ltd. |
Wen S.,Jiangsu Gongda Power Technologies Ltd. |
Zhang Y.,Jiangsu Gongda Power Technologies Ltd. |
And 3 more authors.
SAE International Journal of Engines | Year: 2013
Camless Variable Valve Actuation (VVA) technologies have been known for improving fuel economy, reducing emissions, and enhancing engine performance. VVA can be divided into electro-magnetic, electro-hydraulic, and electropneumatic actuation. A family of camless VVA designs (called LGD-VVA or Gongda-VVA) has been presented in an earlier SAE publication (SAE 2007-01-1295) that consists of a two-spring actuation, a bypass passage, and an electrohydraulic latch-release mechanism. The two-spring pendulum system is used to provide efficient conversion between the moving mass kinetic energy and the spring potential energy for reduced energy consumption and to be more robust to the operational temperature than the conventional electrohydraulic actuation; and the electrohydraulic mechanism is intended for latch-release function, energy compensation and seating velocity control. This paper presents the prototype design of a variable valve-time and two-lift LGD-VVA with bench and engine test results. The designed actuator is able to achieve 3 ms opening and closing response time with satisfactory valve seating velocity and low energy consumption. This is all achieved with a cost-effective design and open-loop control. Copyright © 2013 SAE International.
Jiangsu Gongda Power Technologies Co. | Date: 2014-01-22
A variable throttle device comprises at least two fixed throttle orifices and one switch device. The at least two fixed throttle orifices are connected in series; and the switch device is connected in parallel with at least one of the at least two fixed throttle orifices. In another implementation, a variable throttle device comprises at least two throttle passages and one switch device, each of the at least two throttle passages has at least one fixed throttle orifice or a plurality of fixed throttle orifices connected in series, the at least two throttle passages are connected in parallel, and the switch device is connected in series with at least one of the at least two throttle passages to selectively open or close the at least one throttle passage. The variable throttle device can increase or decrease the throttling resistance to meet the requirements of the valve seating velocity under different operating conditions.
Jiangsu Gongda Power Technologies Co. | Date: 2014-01-03
The present disclosure provides a variable valve time control system and method. The variable valve time control system comprises an actuator, an actuation switch valve, an electronic control unit and a displacement sensor. The electronic control unit controls the actuation switch valve. The displacement sensor detects the engine valve displacement signal. The electronic control unit calculates the engine valve opening and closing times based on the displacement signal from the engine valve displacement sensor, and translates the engine valve opening and closing times into the corresponding switch times of the actuation-switch-valve power output.
Jiangsu Gongda Power Technologies Co. | Date: 2015-01-26
The present disclosure provides an engine valve actuation system comprising: a camshaft, with a plurality of cams: a control shaft one; a control shaft two; and a plurality of valve actuation units, each unit further comprising: (i) at least one set of an engine valve and an engine-valve return spring; (ii) an lost-motion module, further comprising a collapsible high-pressure chamber, and operably converting the profile of the one of the cams and the collapsing motion from the high-pressure chamber to corresponding movement of the at least one engine valve; and (iii) a hydraulic circuit, further comprising: a trigger valve one and a trigger valve two, being controlled respectively by the control shaft one and the control shaft two.
Jiangsu Gongda Power Technologies Co. | Date: 2013-03-26
The present invention discloses an actuator, which is a combination of a hydraulic control unit and a spring-mass mechanical unit, comprising: a housing, with upper and lower ports; an actuation cylinder in the housing; an actuation piston in the actuation cylinder moveable along the longitudinal axis; a first fluid space; a second fluid space; a first piston rod connected to a first surface of the actuation piston; the second piston rod connected to a second surface of the actuation piston; a fluid bypass; a first spring system connected to the first piston rod, biasing the actuation piston in the second direction; a second spring system biasing the actuation piston in the first direction; a first flow mechanism; a second flow mechanism. The present invention also discloses two other preferred embodiments. The actuator features variable valve lift, low energy consumption, fast dynamic response, soft seating and easy controllability.