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Diesel engine for vehicle

A diesel engine, engine technology, applied in engine components, engine control, combustion engine and other directions, can solve the problem of unable to maintain the stable state of main combustion

Inactive Publication Date: 2012-01-11
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the inventors of the present invention have also found that the fuel injection pattern including the above-mentioned pilot injection and main injection cannot maintain the steady state of the main combustion within the operating range where the load on the engine becomes low and the fuel injection amount decreases

Method used

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  • Diesel engine for vehicle
  • Diesel engine for vehicle
  • Diesel engine for vehicle

Examples

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Embodiment Construction

[0036] A diesel engine according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the following descriptions of the preferred embodiments are examples only. figure 1 and 2 A schematic structure of the engine 1 (engine body) of this embodiment is shown. The engine 1 is a diesel engine mounted to a vehicle and supplied with fuel whose main component is diesel fuel. The diesel engine includes a cylinder block 11 having a plurality of cylinders 11a (although only one cylinder is shown in the drawings, the engine of this embodiment is an inline four-cylinder engine having first to fourth cylinders), and Cylinder head 12 on 11, and the oil sump 13 that is arranged under this cylinder block 11 and is used for storing lubricating oil. In the cylinder 11 a of the engine 1 , pistons 14 are reciprocally inserted, and cavities forming part of the neck-type combustion chambers 14 a are formed on the top su...

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Abstract

A diesel engine for a vehicle comprises an engine body mounted in the vehicle having a plurality of cylinders that is supplied with fuel, a plurality of fuel injection valves for directly injecting the fuel into the cylinders, and an injection control module for controlling a mode of injecting the fuel into the cylinders through the fuel injection valves. The injection control module sets a fuel injection amount per cylinder at least according to a load on the engine body, performs a main injection, and performs at least one pre-injection where fuel is injected prior to the main injection. The injection control module further executes a cylinder-cutoff operation mode where the fuel supplies to the cylinder or the cylinders are stopped when the engine body is under a low load condition where the fuel injection amount per cylinder is below a predetermined amount.

Description

technical field [0001] The present invention relates to diesel engines for vehicles, and more particularly to fuel injection control in diesel engines for vehicles. Background technique [0002] In a diesel engine of a vehicle, in order to, for example, reduce NOx and black smoke contained in exhaust gas, reduce noise or vibration, and improve fuel consumption and torque, in each of one or more cylinders in one cycle of the engine Multiple fuel injections are performed. For example, JP2009-293383A discloses a diesel engine that performs fuel injection at five time intervals as follows: main injection for generating torque, prior to the main injection, pilot injection to preheat the cylinder, Pre-injection performed between pilot injection and main injection to suppress ignition delay of fuel injected by main injection, post-injection performed after main injection to increase exhaust temperature, and after post-injection by directly introducing fuel into the exhaust system ...

Claims

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Application Information

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IPC IPC(8): F02D41/38F02D17/02
CPCF02D41/403F02M25/0727F02M25/0707F02D41/0087F02D2700/03F02D2250/18Y02T10/44F02D41/0007F02D35/02F02M26/05F02M26/23Y02T10/40
Inventor 中井英二松元贞治白桥尚俊森永真一
Owner MAZDA MOTOR CORP
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