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Control system and control method for internal combustion engine

A control system and electronic control unit technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as difficulty in accurately detecting exhaust gas SOx concentration

Inactive Publication Date: 2016-10-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there are cases where it is difficult to accurately detect the concentration of SOx in the exhaust gas by the method adopted in the existing equipment

Method used

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  • Control system and control method for internal combustion engine
  • Control system and control method for internal combustion engine
  • Control system and control method for internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0041] figure 1 A schematic structure of an internal combustion engine 10 to which a control system according to an embodiment of the present invention (hereinafter referred to as an implemented system) is applied is shown.

[0042] The engine 10 is a spark ignition internal combustion engine (so-called petrol engine). The engine 10 includes a body portion 20 , an intake system 30 , an exhaust system 40 , an accelerator pedal 51 , a plurality of sensors 61 - 64 , and an electronic control unit 71 . The body portion 20 includes a fuel injection valve 21 , a spark plug 22 , a combustion chamber 23 , a fuel pump 24 , a fuel supply pipe 25 , a piston 26 , a connecting rod 27 and a crankshaft 28 . The intake system 30 includes an intake valve 31 , an intake port 32 , an intake manifold 33 , a throttle valve 34 , an intake pipe 35 and an air filter 36 . The exhaust system 40 includes an exhaust valve 41 , an exhaust port 42 , an exhaust manifold 43 , an exhaust gas purification ca...

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PUM

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Abstract

A control system for an engine including a limiting current sensor, the control system includes an ECU configured to: execute a sweep process for gradually reducing a voltage that is applied to the sensor from a first voltage (V1) to a second voltage (V2); acquire an extreme value (Ip) of an output current of the sensor during execution of the sweep process from output currents of the sensor while a voltage included in a specific voltage range is applied to the sensor, the extreme value being predicted to be output; and detect the concentration of SOx in exhaust gas based on the extreme value and a reference value (Iref), the reference value being a value of limiting current of the sensor, the value of limiting current of the sensor corresponding to the concentration of oxygen having the constant value.

Description

technical field [0001] The present invention relates to a control system and control method for an internal combustion engine that detects the concentration of SOx in the exhaust gas of the internal combustion engine using a limiting current sensor capable of detecting the oxygen concentration in the exhaust gas of the internal combustion engine. Background technique [0002] As a sensor for detecting the concentration of oxygen in exhaust gas, a limiting current sensor including a solid electrolyte, a pair of electrodes (an electrode pair formed of a measurement electrode and a reference electrode), and a diffusion control layer (diffusion barrier layer) is known. Solid electrolytes are capable of conducting oxygen ions. A pair of electrodes is arranged to sandwich the solid electrolyte. A diffusion control layer is provided covering the measurement electrodes. [0003] The principle of detecting the oxygen concentration in the exhaust gas by the above sensor is as follow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14G01N27/407
CPCF02D41/1444F02D41/1454G01N27/4074G01N33/0042Y02A50/20G01N27/407F01N13/008F01N2560/027
Inventor 桥田达弘若尾和弘
Owner TOYOTA JIDOSHA KK
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