Search Results

In today’s scenario, both in gasoline and diesel engines, it is important to reduce power consumed by the auxiliary devices causing parasitic loss. Oil pump is one such device, used for lubrication purpose, which consumes higher power developed by the engine causing parasitic loss. Conventionally gerotor construction pumps are predominantly used in majority of engines, owing to its simpler construction, lower NVH and cost. However, this type being a positive displacement pump, consumes higher power with increase in speed. Hence, variable displacement oil pumps are gaining importance as the oil flow rate can be varied over the entire engine operating range. In this work, basic design elements of variable displacement oil pump are identified followed by building of mathematical model to calculate the critical design parameters. The basic mathematical model built can calculate oil flow rate, leakage losses and power consumption at different speed and load conditions.

As India has decided to move to BS VI emission regulation by 2020, all original equipment manufacturers (OEM) and Tier 1 suppliers are working towards achieving the goal. Overall reduction in CO2 reduction can be achieved through power to weight reduction of various power train components. In a conventional Multi Point Fuel Injection (MPFI) engine, a fuel rail or delivery pipe is mounted on the intake manifold or cylinder head, which delivers fuel to inlet port at a fuel pressure of 350 kPa to 400 kPa through fuel injectors. In today’s automotive industry most of the fuel rail components are made through PDC process of aluminium because of its ease of availability and machinability. Therefore, several studies have focused on alternate materials like sheet metal and plastic by reducing the weight of the fuel rail. Sheet metal fuel rails can also be made with significant weight reduction. However, their manufacturing processes are complex.

Electric coolant pump and electric coolant circulation pumps are one of the main auxiliary devices that can be used to cool the power train components and other accessories such as cabin heating, battery cooling and electronic circuits cooling. Design process of electric coolant pump starts with the target requirement of flow input, which is used to calculate the torque, speed and power of the motor to arrive at the motor specifications. In this overview, the concept of radial field motor and claw pole motor are taken for study. The design of critical parameters of the stator core and its optimization to reduce the core loss, torque ripple is emphasized. The stator core material selection and the appropriate manufacturing methods are explained in detail which allows the designer to optimize the stator core design in terms of performance, cost and compactness.

The automotive industry in world is facing the problem of reduction of emissions coming out of the engine. Also, the stringent emission norms imposed by the regulating body for transition from BS IV to BS VI urges the auto makers to concentrate on new technologies to reduce the emissions. One of the major emissions coming out of the diesel engine is oxides of nitrogen (NOx) which is detrimental to human health. This NOx emission is formed when the combustion temperature of engine exceeds the threshold limit. There are several methods available to reduce these NOx emissions formed in-cylinder. Exhaust Gas Recirculation (EGR) is one such system, which reduces the NOx emission formed inside the engine by supplying a portion of the exhaust gases. By re-circulating exhaust gases, the air admitted to the engine is diluted. Further, due to the high latent heat of vaporization of water, water vapor tends to absorb more amount of heat that is generated during combustion.