Kittipong Yaovaja

• Doctor of Engineering
• Kasetsart University

Common rail systems have added a new degree of freedom in controlling diesel engines. A diesel-dual-fuel, premixed-charge-compression-ignition (DF-PCCI) engine was modified from a diesel engine by injecting compressed natural gas (CNG) into the intake ports as the main fuel and injecting a smaller amount of diesel directly into the cylinders. The d...

Typical diesel-dual-fuel (DDF) engines have compressed natural gas (CNG) injected into the intake ports as the main fuel and diesel injected into the cylinders for ignition. Recently, a new DDF combustion technology, developed and patented by the PTT Public Company Limited, advanced the diesel injection timing to be early in the compression stroke,...

One example of the manual control of flexible system is the crane operator trying to move a swinging payload from point to point as fast and as accurate as possible. The payload swing definitely slows the task. Recent work has proposed placing an input shaper inside the feedback loop, socalled closed-loop signal shaping, to suppress the residual vi...

Input shaper is a pre-filter, designed to suppress residual vibration of flexible systems. The input shaper can be placed inside the feedback loop, in front of the flexible plant, to avoid exciting the plant vibratory modes. The performance of this so-called closed-loop signal shaping is limited due to the time delay brought about by the input shap...

In this paper, fuzzy supervisor of PID controller for ball balancing on a Stewart platform (ball and plate system) was implemented. Small-size Stewart platform was built and used for demonstrating the application of the controller. HD web camera was the visual sensor for sensing the ball position. After image processing, by using color threshold an...

In the Covid-19 epidemic, the automated guided vehicles (AGVs) could be use in material handling which prevent interpersonal contact and be a factor in reducing the epidemic. As the consequence of the labor shortage, the recruitment of labor on material handling tends to be scarce and the labor cost is also higher. Therefore, the solution is to use...

Fine particulate matter (PM2.5) emission causes health problems and deaths of people in densely populated cities whose cannot handle of air pollution. The emission causes from different sources and effects such as wildfire smoke, exhaust fumes from industry and traffic, and some effects such as wind and precipitation. Diesel engines, highly used fo...

Non-linearity and flexibility of a joint of SCARA robot are more problematic in controller and challenging. In this research, the prototype flexible-joint robot was designed and tested. Dynamic model of the prototype was described by energy method; Lagrange equation was used to find the equation of motion. The experiment with a Fuzzy controller was...

Challenging in control of a flexible-joint robot is residual vibration due to non-linearity and flexibility of a joint. Furthermore, in a 2-DOF serial flexible-joint robot, there is interaction of Link-1 control and Link-2 control. In this research, the prototype flexible-joint robot was designed and tested. The flexible-joints have springs and fle...

The firstly implemented 5G mobile network in South East Asia was located at Kasetsart University, Sriracha Campus, Thailand since February, 2019. In this research, an ABB IRB120 industrial robot was implemented with the 5G mobile network. A magic pen was installed on the end-effector of the ABB robot as the robot tool. The IRC5 Compact controller,...

Challenging in control of a flexible-joint robot is residual vibration due to non-linearity and flexibility of a joint. Furthermore, in a 2-DOF serial flexible-joint robot, there is interaction of Link-1 control and Link-2 control. In this research, the prototype flexible-joint robot was designed and tested. The flexible-joints have springs and fle...

The detection and reduction of Diesel-Dual-Fuel engine knock is the important function of powertrain control to ensure engine longevity. In this paper, appropriate knock detection system of DDF engines, based on a Motorola ProSAK IC, was implemented. The electronic control unit (ECU) received high-frequency vibration signal from a piezo-electric kn...

Dual Fuel Diesel engine with natural gas is a modified Diesel engine in order to replace the conventional Diesel fuel with the alternative fuel. Because the mechanical system of the engine is not modified and the engine still has high compression ratio, the engine robustness and the engine efficiency are high. On the other hand, the engine needs a...

Diesel-Dual-Fuel Engine is a modified diesel engine by installing a secondary fuel system; which in this case is a natural gas system. In our diesel-dual-fuel engines, natural gas as a main fuel is injected in the intake ports of each cylinder of the engine just before intake valve close (IVC). Small among of diesel is a pilot fuel which acts like...

DF-PCCI engine is a type of diesel-dual-fuel engines. DF-PCCI engine, patented by PTT, uses new combustion strategy corresponding to Premixed-Charge-Combustion-Ignition (PCCI) combustion mode. Diesel injection is advanced till early of the compression stroke along with nature gas (compressed natural gas, CNG) is injected in the intake ports of each...

Knock behavior in diesel-dual-fuel (DDF) engine is more complex, more severe, and different than those of traditional engines. We investigate a type of diesel-dual-fuel engines, where CNG is multipoint-injected at the intake ports as main fuel and diesel is directly injected in smaller amount, mainly for ignition purpose, resulting in lower fuel co...

From our experiences in converting diesel engine into diesel-dual-fuel engine with natural gas as primary fuel, accurate air/fuel ratio control is vital to the high engine performance, good vehicle drivability, and low emissions. Two components enter in calculating the air/fuel ratio, namely, the amount of fresh air and the amount of diesel and nat...

A two-wheeled robot is independently driven by two concentric motors. The two-wheeled robot is a marginally stable plant. Over the last decade, researchers have designed controllers for stabilizing the robot and obtaining some desired responses. In this paper, the LQR control of a two-wheeled robot is designed and implemented. Luenberger Observer i...

Accurate common-rail pressure control is vital to good engine performance and low emission. Injection strategy of diesel-dual-fuel engine varies more greatly with speed and load than its diesel engine predecessor, and so does the common-rail pressure set point. Along with this swift set point change, other control challenges exist; they are speed-a...

Accurate air-fuel ratio control is required for good engine performance and low emission in diesel dual fuel engine. Two actuators directly affect the ratio are the air throttle and the EGR valve. Maximum air throttle opening is favorable to minimize pumping loss, and the EGR valve opening should follow closely the values in a well-tuned map to min...

Control of two-wheeled robot represents both theoretical challenge and practical versatility. The theoretical challenge ranges from robot structure design, sensor and actuator selection and fusion, controller hardware selection and its limitation, to the robot’s intrinsic properties that hamper control design. Nevertheless, the robot’s ability to t...