JPS6229745A - Fuel injection controller - Google Patents

Abstract

PURPOSE:To perform accurate control corresponding to the quality of fuel oil thus to maintain fuel consumption to the minimum, in fuel injection controller for Diesel engine, by providing a comparison controller for controlling the fuel injection start timing of fuel injector. CONSTITUTION:Fuel oil quality operating unit 12 for receiving the operating signals from an output operating unit 7 and injection operating unit 11 to operate the engine output per unit flow is provided. A detected engine output signal 13 and referential engine output signal 14 are compared through comparator/ controller 15 thus to control the fuel injection start timing of fuel injector 8 on the basis of the difference. Consequently, accurate control can be performed in correspondence with the fuel oil quality thus to maintain the fuel consumption to the minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel injection control device for a diesel engine.

[Conventional technology 1] In deep-pil engines, especially marine diesel engines, the quality of fuel oil often changes depending on the port of call of the ship (for example, poor quality oil may enter), and when the quality of fuel oil changes, the unit weight Since the amount of heat generated per unit changes and the combustion time changes, it is necessary to control the injection start timing to keep the fuel consumption to a minimum from the viewpoint of economy.

For this reason, in the past, the maximum pressure within the engine cylinder was monitored, and when the pressure became low, the fuel oil quality had deteriorated, and the injection start timing was brought forward.

[Problems to be solved by the invention] However, in the above conventional system, the cylinder internal pressure is
In addition to changes in the fuel oil quality, it also varies greatly due to changes in torque due to load fluctuations, combustion air conditions, etc. For this reason, it is not possible to boldly control the injection start timing based only on the cylinder pressure, and it is not possible to accurately control the injection start timing. There was no control.

The present invention was made by focusing on the above-mentioned conventional problems.
The purpose is to calculate the fuel oil quality of a diesel engine and control the fuel injection start timing based on it.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problems, and includes a device for calculating engine output from the rotation speed and torque of a diesel engine, and a system for opening and closing an injection valve of a fuel injection device. A device that calculates the fuel injection group from the fuel injection pressure, a fuel oil quality calculation device that calculates the engine output per unit flow rate from the engine output and fuel injection amount from both calculation devices, and the fuel oil quality calculation device. The engine output per unit flow rate of the reference fuel oil is compared with the engine output per unit flow rate of the reference fuel oil. This is related to the fuel injection control Iv4 setting.

[Function] Therefore, in the present invention, the engine output per unit flow Φ is determined from the engine output obtained from the rotation speed and torque of the diesel engine, and the fuel injection rate obtained from the opening/closing of the injection valve of the fuel injection device and the injection pressure. Accurate control is achieved by calculating the output, that is, the fuel oil quality, comparing it with the 41-gate output per unit flow of standard fuel oil, and adjusting the fuel 1 injection start timing based on the difference. This can reduce fuel consumption.

[Example] An actual example of the present invention will be explained below with reference to the drawings.

The drawing shows an example of the present invention, in which a rotation speed signal 5 and a torque signal 6 from a rotation/torque detector 4 provided at the output @ 3 of a diesel engine 2 that rotationally drives a screw 1 are shown.
In addition, an output performance T3 device 7 is provided which calculates the output of the engine based on the signal 9 and the signal 10 which detects the opening and closing of the injection valve in the fuel injection device 8 of the diesel engine 2 and the signal 10 which detects the fuel injection pressure. ! ) j is provided with an injection m calculation device 11 that calculates I, and further includes a fuel oil quality calculation device 12 that inputs the calculation signals from the output calculation device 7 and the injection amount calculation device 11 to calculate the engine output per unit flow rate. established,
The engine output signal 13 per unit flow rate from the fuel oil quality calculation device 12 is converted into the engine output signal 1 per unit flow rate of the reference fuel.
A control signal 16 based on the difference is used to adjust the governor of the fuel injection device 8 to advance or delay the start timing of fuel injection by the injector. I'm trying to adjust it accordingly.

As described above, the engine output calculated by the output output device 7 and the jet tf! From the fuel injection amount calculated by the 1ffi calculating device 11, the engine horn 13 per unit flow rate is calculated by the fuel oil trader 12. This refers to the quality of the fuel.

Therefore, the detected engine output signal 13 and the reference engine output signal 14 for the standardly determined fuel oil are compared by the comparison control device 15, and depending on the difference, that is, the difference in the quality of the fuel oil, the injection of the fuel injection device 8 is performed. It is possible to optimally self-help control the fuel injection start timing using the valve and achieve fuel savings.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the fuel injection control device of the present invention, the engine output per unit flow rate of fuel, that is, the fuel oil quality is detected, and this is determined as the engine output per unit flow rate of the reference fuel oil. Since the fuel injection start timing is controlled based on the difference, it is possible to perform accurate control according to the fuel oil quality, and this has the excellent effect of keeping fuel consumption to a minimum. It can be played.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing an example of the present invention. 2 is a diesel engine, 3 is an output shaft, 4 is a rotation/torque detector, 5 is a rotation speed signal, 6 is a torque signal, 7 is an output calculation device, 8 is a fuel injection device, 9 is an injection valve ON/close signal,
10 is a fuel injection pressure signal, 11 is a futa pressure calculation device, 12
13 is a detection engine output signal, 14 is a reference engine output signal, and 15 is a comparison control device. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Scope of Claims] 1) A device that calculates the engine output from the rotation speed and torque of the diesel engine, a device that calculates the fuel injection amount from the opening/closing of the injection valve of the fuel injection device and the fuel injection pressure, and a device that calculates the fuel injection amount from the opening and closing of the injection valve of the fuel injection device and the fuel injection pressure. A fuel oil quality calculation device that calculates the engine output per unit flow rate from the engine output and fuel injection, and a comparison between the detected engine output from the fuel oil quality calculation device and the engine output per unit flow rate of the reference fuel oil. A fuel injection control device comprising a comparison control device that controls fuel injection start timing of the fuel injection device based on the difference.