Method and system for calculating replacement rate of dual-fuel engine

A dual-fuel engine, replacement rate technology, applied in the direction of engine control, machine/engine, fuel injection control, etc., can solve the problems of increasing inaccuracy, many operating conditions, and long calibration time, so as to reduce the error rate, The effect of low cost and optimized structure

Inactive Publication Date: 2020-07-03
WEICHAI HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The current scheme mainly has two defects: 1. The calibration is complicated, because the speed-load fuel consumption meter needs to involve all working conditions in order to calculate the replacement rate more accurately. long
2. The accuracy rate is low, and the speed and load of the calibration table have intervals. For example, the speed interval is 100 rpm, and the fuel consumption at 1000 rpm and 1100 rpm is recorded in the calibration table, but in actual operation, the speed is continuous. When the speed is 1050, fuzzy calculation is required, and the load and speed calibration tables are not continuous, which increases the inaccuracy

Method used

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  • Method and system for calculating replacement rate of dual-fuel engine
  • Method and system for calculating replacement rate of dual-fuel engine
  • Method and system for calculating replacement rate of dual-fuel engine

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Embodiment 1

[0041] A method for calculating the replacement rate of a dual-fuel engine, comprising the following steps:

[0042] Step 1. Obtain real-time substitute fuel consumption and replaced fuel consumption in dual-fuel mode; this real-time substitute fuel consumption and replaced fuel consumption can be calculated in real time for electronically controlled models, and can also be used for non-electronically controlled models Or it can be obtained by installing a fuel quality analysis device on the electronic control model;

[0043] Step 2. Use the formula Calculate the substitution rate,

[0044] where Q b测 For real-time measurement of alternative fuel consumption in dual-fuel mode, Q a测 In order to measure the consumption of replaced fuel in real-time in dual-fuel mode, X is the correction coefficient;

[0045] The correction coefficient is a calibration value, which can be obtained from the calibration table according to the consumption of alternative fuels.

[0046] In the ...

Embodiment 2

[0058] like figure 2As shown, a system for calculating the replacement rate of a dual-fuel engine includes a control unit, a data measurement unit electrically connected to the control unit, a correction unit and a replacement rate calculation unit. In this example, the control unit is integrated on the electronic control unit of the engine, which optimizes the structure and reduces the cost. Of course, the system can be directly set in the instrument, and the control unit can be a microprocessor at this time.

[0059] Among them, the data measurement unit is used to measure the consumption of alternative fuel and the consumption of replaced fuel;

[0060] Among them, the correction unit checks the calibration table according to the measured consumption of alternative fuels, and obtains the correction coefficient;

[0061] The substitution rate calculation unit calculates the substitution rate according to the following formula,

[0062]

[0063] where Q b测 For real-ti...

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Abstract

The invention discloses a method and a system for calculating the replacement rate of a dual-fuel engine, and relates to the field of dual-fuel engines. The method comprises the following steps of firstly obtaining real-time replacement fuel consumption and replaced fuel consumption in dual-fuel mode, checking correction factors obtained from a calibration scale according to the real-time replacement fuel consumption, and calculating the real-time replacement rate by using a calculation formula of the application. In addition to the correction factors in the calculation formula of the application, other factors are real-time data, so that the calculation results are more accurate, the correction factors are slightly affected by environment and working conditions, the replacement rate calculation is more accurate, and the error rate is reduced; at the same time, through the introduction of the correction factors, the method the system can also be adapted to different fuels and differentmodels, and have a wide application range; and the method and the system have the advantages of low cost, reliable operation and easy implementation.

Description

technical field [0001] The invention relates to the technical field of dual-fuel engines, in particular to a method and system for calculating a replacement rate of a dual-fuel engine. Background technique [0002] When a dual-fuel (such as diesel-natural gas) engine is in use, the customer needs to display the replacement rate, so as to visually check the fuel consumption and grasp the fuel replacement status. Among them, the substitution rate is the ratio of the reduced amount of substituted fuel to the amount of fuel consumed under the same working conditions for a single fuel after fuel substitution. [0003] Currently, the most commonly used method for calculating the substitution rate is: taking the rotational speed and load as coordinates, pre-calibrating and recording the fuel consumption meter of the corresponding working condition when the single fuel is used on the bench, and measuring the replaced fuel such as diesel in real time when entering the dual-fuel mode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/08F02D41/00
CPCF02D19/081F02D41/0025F02D19/0647
Inventor 李杰
Owner WEICHAI HEAVY MACHINERY
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