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Variable nozzle turbocharging control method and system for vehicle engine

A vehicle engine, turbocharging technology, applied in engine control, combustion engine, fuel injection control and other directions, can solve the problems of complex system structure, supercharger response lag, difficult low-speed torque of the engine, etc., to achieve a simple system structure, The effect of fast response and improved dynamic performance

Inactive Publication Date: 2002-10-16
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

The disadvantages of the fixed section turbocharger are: (1) When the engine is running at low speed, due to the little energy provided by the exhaust gas, the speed of the turbocharger is too low, and it is difficult to provide a suitable boost pressure and sufficient intake air , it is difficult for the engine to generate a large low-speed torque, which makes it difficult to significantly improve its low-speed performance
(2) When the engine is running at high speed, the supercharger may overspeed due to the high exhaust temperature and pressure
(3) There is only aerodynamic connection between the supercharger and the engine, and the response of the supercharger lags behind during acceleration
[0006] The main disadvantages are: (1) Due to the large number of actuators and the complex structure of the system, the cost of manufacturing is increased
(2) Adjusted by the vacuum degree of the diaphragm spring, the rapid response performance of the nozzle ring action is not enough when the engine changes transiently

Method used

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  • Variable nozzle turbocharging control method and system for vehicle engine
  • Variable nozzle turbocharging control method and system for vehicle engine
  • Variable nozzle turbocharging control method and system for vehicle engine

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Embodiment Construction

[0031] The working principle, specific structure and embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] figure 1 It is a schematic diagram of the hardware structure connection of the electronic control unit. Microcontroller adopts MC68HC11E9 single-chip microcomputer, throttle position, boosted intake air temperature and intake air pressure are analog signals, and their values ​​are output to the AD acquisition port of the single-chip microcomputer, and engine speed, start switch and fault diagnosis switch are digital signals, which are output to The digital detection port of the one-chip computer. Control software is stored in the memory expansion circuit, which is directly connected with the single-chip microcomputer. The power supply circuit provides 5 volts for the single-chip microcomputer and other chips, and provides 12 volts for the driving circuit at the same time, and its power supply is pr...

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Abstract

The present invention relates to electric control system for turbocharging of engine and the variable nozzle turbocharging control method and system features that in the electric control system,target pressure value is obtained through collecting the rotation speed, oil valve position, charging pressure and intake temperature of the engine and judging the working state of the engine. In the system, stepped motor as the executor is connected to the regulating crank of turbine nozzle ring via a link. During the transition course, the nozzle ring opening is regulated to some certain value by theexecutor through open-loop predication control; and while during stable state, closed-loop digital PID control has the charging pressure signal of intake manifold as controlled target.

Description

technical field [0001] The invention relates to an engine turbocharger system, in particular to a vehicle variable nozzle turbocharger system, which realizes optimal control of the position of the variable section nozzle through an electronic control unit and a software control algorithm. Background technique [0002] A turbocharger for a vehicle must adapt to a wide range of engine speed changes. The disadvantages of the fixed-section turbocharger are: (1) When the engine is running at low speed, due to the little energy provided by the exhaust gas, the speed of the turbocharger is too low, and it is difficult to provide a suitable boost pressure and sufficient intake air , it is difficult for the engine to generate a large low-speed torque, which makes it difficult to significantly improve its low-speed performance. (2) When the engine is running at high speed, the supercharger may overspeed due to the high exhaust temperature and pressure. (3) There is only an aerodynam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D23/00F02D41/26
CPCY02T10/12
Inventor 王恩华欧阳明高李建秋周明龚振青
Owner TSINGHUA UNIV
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