Rapid gas storage and feeding control method of supercharged engine air system based on demand torque prediction

A supercharged engine, demand torque technology, applied in the direction of engine control, electrical control, combustion engine, etc., can solve the problems of slow instantaneous torque response, poor fuel consumption and emission of supercharged engines, so as to improve the quality of air-fuel ratio control and improve power Performance, improved emissions and fuel consumption

Active Publication Date: 2020-09-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fast gas storage and supply for the air system of the supercharged engine based on demand torque prediction for the problems of slow transient torque response, transient fuel consumption and poor emission of the supercharged engine in the prior art Control Method

Method used

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  • Rapid gas storage and feeding control method of supercharged engine air system based on demand torque prediction
  • Rapid gas storage and feeding control method of supercharged engine air system based on demand torque prediction

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Embodiment 1

[0036] A fast gas storage and supply control method for a supercharged engine air system based on demand torque prediction, comprising the following steps:

[0037] Step 1, the conventional air supply control strategy finds the time series of the current demand torque and the predicted demand torque;

[0038] Step 2, if the predicted demand torque does not increase after n seconds in the future, return to step 1;

[0039] If the predicted demand torque increases after n seconds in the future, it is further judged whether the current demand torque increases:

[0040] If the current demand torque does not increase, start the transient air storage control strategy, and enter step 3; if the current demand torque increases, start the transient air acceleration supply strategy, and enter step 6;

[0041] Step 3, calculating the current required intake air volume according to the current demand torque, and calculating the future required intake air volume according to the predicted ...

Embodiment 2

[0048] This embodiment is further described in detail on the basis of Embodiment 1.

[0049]In the step 1, the conventional air supply control strategy can adopt any existing conventional control strategy, for details, reference can be made to the literature (Eriksson L, Nielsen L. Modeling and control of engines and drivelines. John Wiley & Sons, 2014).

[0050] In the step 3, the method of calculating the current required intake air volume according to the current demand torque is: calculate the required fuel injection volume per cylinder and cycle according to the current demand torque and the thermal efficiency of the engine, and then combine the engine air- Fuel ratio control requirements, calculate the current required intake air volume, that is, the air volume; the method of calculating the future required intake air volume according to the predicted demand torque is: calculate the required per cylinder according to the predicted demand torque and the thermal efficiency ...

Embodiment 3

[0057] This embodiment simulates the method of the present invention, and the schematic diagrams of torque prediction, fast gas storage and fast gas supply in the present invention are as follows figure 2 shown.

[0058] at t 0 At time , the predicted demand torque starts to increase, but the current actual demand torque has not yet risen (such as figure 2 As shown in (a)), it enters the transient gas storage stage, so enter step 3 to calculate the required intake air volume. Afterwards, after calculation in step 4, the target pressure before the throttle of the transient gas storage control strategy ( figure 2 Shown in (b)) begins to rise, which is higher than the pre-throttle target pressure calculated by conventional methods. In order to track the target pre-throttle pressure, in the adjustment of step 5, ( figure 2 Shown in (e)) the opening of the blow-off valve or nozzle ring of the supercharger is reduced (less than the value of the conventional method, because t...

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Abstract

The invention discloses a rapid gas storage and feeding control method of a supercharged engine air system based on demand torque prediction. The rapid gas storage and feeding control method comprisesthe steps that when it is predicted that large torque output is required in future, firstly a supercharger air vent valve or a nozzle ring is turned down, pressure before an air damper is lifted, meanwhile, the air damper keeps pressure in an air inlet manifold to be approximately constant, and relative high-pressure and high-density air is stored in a pipeline between the air damper and a gas compressor in advance; and when the actual torque demand immediately comes, the air damper is rapidly turned up, and the stored high-density air is used for accelerating air feeding. According to the rapid gas storage and feeding control method of the supercharged engine air system based on the demand torque prediction, the torque response speed in the transient process is effectively improved, andthe oil consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a fast gas storage and supply control method for a supercharged engine air system based on demand torque prediction. Background technique [0002] Intake supercharging is a technology widely used in modern engines, and it is an important means to increase the power per liter and realize small strengthening. However, with the enhanced degree of engine downsizing and the implementation of the RDE (Real Driving Emissions) test cycle, the quick response of engine torque not only directly affects power performance, but also affects fuel consumption and emissions. [0003] At present, there are several ways to improve the torque response of the engine: 1) using the motor or other power sources to drive the vehicle together with the engine to form a hybrid technology; 2) using variable cross-section turbocharging (VGT) technology to accelerate the air response; 3) The electric-assisted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D9/02F02B37/24F02B37/16F02D41/18F02D41/14
CPCF02B37/24F02D9/02F02D41/0007F02D41/1473F02D41/18F02B37/162Y02T10/12Y02T10/40
Inventor 宋康谢辉
Owner TIANJIN UNIV
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