摘要:
An air/fuel ratio control system is provided for use with an internal combustion engine. The system includes a first air/fuel ratio detector arranged on an upstream side of a catalytic converter so as to detect the air/fuel ratio of the engine from components of exhaust gas, a second air/fuel ratio detector arranged in the exhaust system and having a detection response speed slower than the first air/fuel ratio detector, a device for controlling the air/fuel ratio of the engine on the basis of results of a comparison between a detection value from the first air/fuel ratio detector and a predetermined first reference value, a device for effecting a correction to the control of the air/fuel ratio by the air/fuel ratio control device on the basis of results of a comparison between a detection value from the second air/fuel ratio detector and a predetermined second reference value, and a device for shifting the second reference value to a lean air/fuel ratio side in a specific operation state of the engine.
摘要:
An air/fuel ratio control system is provided for use with an internal combustion engine. The system includes an air/fuel ratio detector arranged on an upstream side of a catalytic converter so as to detect the air/fuel ratio of the internal combustion engine from components of exhaust gas, a device for controlling the air/fuel ratio of the internal combustion engine on the basis of results of a comparison between a detection value from the air/fuel ratio detector and a predetermined reference value; and a device for shifting the reference value to a lean air/fuel ratio side in a specific operation state of the internal combustion engine.
摘要:
A method of and an apparatus for controlling the air fuel ratio of an internal combustion engine by which the air fuel ratio can be controlled so that the exhaust gas purifying efficiency of a catalytic converter for purifying exhaust gas of the engine may be maximum. In the apparatus, exhaust gas of the engine is first passed through a catalytic converter and then is introduced into an oxygen concentration sensor of the .lambda. type. When the air fuel ratio is compulsorily varied, the compulsorily varied condition of the air fuel ratio such as an average of variations of the air fuel ratio (average air fuel ratio) is corrected in accordance with an output of the oxygen concentration sensor thereby to control the air fuel ratio so that the purifying efficiency of the exhaust gas purifying catalytic converter may be maximum.
摘要:
An air/fuel ratio control system is provided for an internal combustion engine. The system includes first and second oxygen density sensors, an air/fuel ratio control device and a standard-value changing device. The first oxygen density sensor is arranged on an upstream side of a catalytic converter, while the second oxygen density sensor is provided either inside or on a downstream side of the catalytic converter. The air/fuel control device controls the air/fuel ratio of the internal combustion engine on the basis of results of comparison between a detection value from one of the first and second oxygen density sensors and a predetermined standard value. The standard-value changing device changes the standard value on the basis of outputs from the first and second oxygen density sensors.
摘要:
Disclosed herein is an air/fuel ratio control system for an internal combustion engine. The system includes a first oxygen density sensor element, a second oxygen density sensor element having a slower detection response speed than the first sensor element, an air/fuel ratio control unit for controlling the air/fuel ratio of the engine on the basis of results of a comparison between a detection value from the first sensor element and a standard value, and an air/fuel ratio control correction means for effecting a correction to the air/fuel ratio control by the air/fuel ratio control unit on the basis of results of comparison between a detection value from the second sensor element and a second standard value. An air/fuel ratio controlling oxygen density sensor is also disclosed. The sensor is constructed of a first oxygen density sensor element and a second oxygen density sensor element for detecting the density of oxygen in exhaust gas at a slower detection response speed compared to the first sensor element. The first and second oxygen density sensor elements are both provided on a common base member.
摘要:
An apparatus for controlling the supply of air to a burner used to recombust diesel particulates trapped in a ceramic filter. The inventive control apparatus includes an exhaust bypass line that bypasses the filter, an air supply line leading to a burner associated with the filter, a flow control valve that adjusts the cross-sectional area for the air flow in the air supply line, a relief valve that maintains a constant difference between pressures at points upstream and downstream of the flow control valve, and a control unit that controls the degree of opening of the flow control valve. With the invention, precise control over the flow rate of secondary air is ensured.
摘要:
A particulate oxidizer system for a diesel engine comprises a diesel particulate oxidizer (DPO) in the exhaust line to collect and burn particulates in the exhaust. The DPO comprises ceramic foam with a catalyst. When the quantity of particulates in the DPO reaches a predetermined value, high temperature gas containing oxygen is fed to the DPO to burn off (regenerate) the collected particulates. This is achieved by retard control of the injection timing under control of an engine control unit (ECU). A regeneration timing detection means detects the regeneration timing in the DPO. When the quantity of particulates in the DPO falls below a predetermined value, the ECU provides a signal to increase the idling revolution of the engine.
摘要:
A feedback control system for an air-fuel ratio according to the present invention comprises a first oxygen sensor for detecting the oxygen concentration of exhaust gas flowing through a first exhaust pipe of an internal combustion engine, a second oxygen sensor for detecting the oxygen concentration of the exhaust gas passed through an exhaust gas disposer in a common exhaust passage which is connected with both first and second exhaust pipes of the engine, and an electronic control unit for calculating the amount of fuel supply to each cylinder of the engine in accordance with the oxygen concentration of the exhaust gas detected by means of the first oxygen sensor. The electronic control unit contains therein a correction circuit for correcting the amount of fuel supply to that cylinder of the engine which is associated with the second exhaust pipe, in accordance with the oxygen concentration of the exhaust gas detected by means of the second oxygen sensor.
摘要:
Flammable fine particles (particulates) consisting principally of carbon and hydrocarbons are discharged from a diesel engine to its exhaust system. A diesel particulate oxidizer (DPO) is disposed in the exhaust passage for collecting and burning the particulates without allowing the particulates to be discharged directly to the atmosphere. This DPO comprises a ceramic foam with catalyst. When the quantity of particulates collected is above a predetermined value, the DPO will undergo clogging. To prevent this, a high temperature gas containing oxygen is fed to the DPO to burn (regenerate) the collected particulates. In order to accelerate the normal regeneration of the DPO, there are provided a regeneration means for making a retard control of the fuel injection timing in the diesel engine, and a regeneration timing control means for controlling the operation of the regeneration means. Further, there is provided a regeneration timing detection means for detecting the regeneration timing of the DPO.
摘要:
A self-diagnosis system for a vehicle, with which it is possible, without requiring skill and practice, to realize running according to a running pattern and easily and certainly cause an ECU to execute a self-diagnosis. The self-diagnosis system comprises: a vehicle state detecting unit for detecting a vehicle state; a data processing unit for executing a diagnosis of a diagnosis object device on the basis of a predetermined running pattern preset in correspondence with the diagnosis object device and a vehicle state detected by the vehicle state detecting unit when running according to the running pattern is carried out; and a diagnosis data processing unit, data-transferably connected to the data processing unit, for obtaining and displaying data from the data processing unit, and under a condition that the diagnosis data processing unit is data-transferably connected to the data processing unit and the vehicle is run in a predetermined running pattern corresponding to a diagnosis object device in order to execute a diagnosis to the diagnosis object device, the diagnosis data processing unit displays that an execution condition is established when the execution condition of the diagnosis corresponding to the running pattern is established.