Cylinder Fuel Cut Control for Catalyst Temperature Increase
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Solution Overview
Problem
Existing catalyst temperature increase control methods for exhaust gas control apparatuses in vehicles fail to sufficiently increase catalyst temperature and supply oxygen, especially during low environmental temperatures or high load operations, leading to reduced drivability and inefficient particulate filter regeneration.
Innovation Solution
A control method that involves stopping fuel supply to one cylinder and increasing fuel supply to remaining cylinders, while using the evaporative fuel treatment device to reduce fuel introduction into the intake pipe, and utilizing the electric motor to supplement power, ensuring sufficient oxygen is provided to the catalyst and particulate filter for temperature increase and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If catalyst temperature increase control is executed by stopping fuel supply to one cylinder and supplying fuel to remaining cylinders, then catalyst temperature increases and oxygen is supplied to the exhaust gas control apparatus, but drivability deteriorates due to power loss from the fuel cut cylinder
Solution Approach 1:
The engine cylinders are segmented into fuel-cut cylinders and fuel-supplied cylinders. By selectively stopping fuel supply to specific cylinders while maintaining fuel supply to others, the system creates localized rich and lean exhaust gas streams that mix downstream to achieve both catalyst temperature increase and adequate power output.
Solution Approach 2:
The air-fuel ratio parameter is changed differently across different cylinders. Some cylinders operate with rich air-fuel ratios (fuel supplied) while others operate with lean or no-fuel conditions (fuel cut), allowing the exhaust gas mixture to provide oxygen for catalyst regeneration while maintaining overall engine power through the rich cylinders.
2Quantity of substance
If fuel cut is executed for a long duration to ensure sufficient oxygen supply, then oxygen is adequately provided to the catalyst and particulate filter, but torque shock and drivability deterioration increase
Solution Approach 1:
The fuel cut operation is executed periodically rather than continuously. The control device alternates between fuel-cut modes and normal fuel supply modes, providing oxygen bursts to the exhaust gas control apparatus while allowing the engine to return to normal operation, thereby preventing prolonged torque shock and maintaining drivability.
Solution Approach 2:
Instead of cutting fuel to all cylinders simultaneously, the system applies fuel cut to only one or select cylinders while maintaining fuel supply to other cylinders. This partial action provides sufficient oxygen for catalyst regeneration without causing complete power loss and severe drivability deterioration.
3Quantity of substance
If evaporative fuel introduction is reduced during catalyst temperature increase control, then sufficient oxygen is maintained in the intake charge, but evaporative fuel treatment efficiency decreases
Solution Approach 1:
The control device determines in advance whether the intake charge contains sufficient oxygen before reducing evaporative fuel introduction. By checking oxygen levels beforehand and only reducing evaporative fuel when oxygen is adequate, the system maintains oxygen concentration for catalyst regeneration while minimizing the impact on evaporative fuel treatment efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases catalyst temperature, ensures sufficient oxygen supply for particulate filter regeneration, and maintains drivability during load operations by accurately supplementing power and managing air-fuel ratios, even in low-temperature environments.
Implementation Method 1
The exhaust gas control apparatus includes a catalyst. The catalyst removes exhaust gas from the multi-cylinder engine.
Implementation Method 2
oxygen and unburned gas are sent to the catalyst device, and the catalyst device is warmed up by reaction heat of an oxidation reaction
Implementation Method 3
The evaporative fuel treatment device is configured to introduce evaporative fuel generated in a fuel tank configured to store fuel of the multi-cylinder engine into an intake pipe of the multi-cylinder engine.
Data Source
AI summary
A vehicle includes a power generation device including at least a multi-cylinder engine, the power generation device being configured to output drive power to wheels, an exhaust gas control apparatus including a catalyst for removing exhaust gas from the multi-cylinder engine, and a control device configured to execute catalyst temperature increase control for stopping fuel supply to at least one cylinder and supplying fuel to remaining cylinders in a case where a temperature increase of the catalyst is requested during a load operation of the multi-cylinder engine, execute control such that the power generation device supplements insufficient drive power due to the execution of the catalyst temperature increase control, and decrease an amount of evaporative fuel introduced into an intake pipe by an evaporative fuel treatment device during the execution of the catalyst temperature increase control compared to a case where the catalyst temperature increase control is not executed.