Engine Controller Warm-Up Strategy for Catalyst Activation
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Solution Overview
Problem
Existing engine controllers in hybrid vehicles often fail to ensure the engine catalyst is sufficiently active, leading to increased hazardous substances in automobile gas emissions, particularly during transitions between engine operation modes.
Innovation Solution
An engine controller that performs a continuous warm-up operation for the engine catalyst by setting a predetermined output value until a specific air intake integration value is reached, and then continues operation for a period based on coolant temperature, ensuring the catalyst remains active even after the initial warm-up period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine is started frequently to meet power demands in hybrid vehicles, then the motor can be driven by electric power from the battery, but the engine catalyst remains inactive leading to increased hazardous substances in emissions
Solution Approach 1:
The system performs preliminary warm-up operation of the engine catalyst before normal operation begins. The control unit sets the engine output to a predetermined limit value during a warm-up period to activate the catalyst, ensuring it is ready to purify emissions before the engine starts frequent cycling for power delivery.
Solution Approach 2:
The control unit determines whether to continue engine operation after the warm-up period by evaluating whether the catalyst has been sufficiently activated. This ensures continuous useful action of the catalyst without unnecessary engine cycling, maintaining emission control while meeting power demands.
2Reliability
If the catalyst warm-up period is extended to ensure sufficient catalyst activation, then emission purification capability improves, but battery consumption increases
Solution Approach 1:
The control unit continuously monitors engine operating conditions, vehicle speed, and catalyst temperature to dynamically determine the appropriate warm-up period duration. This feedback mechanism ensures the catalyst receives sufficient activation time while preventing excessive battery consumption by adjusting the warm-up period based on actual conditions.
Solution Approach 2:
The system dynamically adjusts the engine output limit value and warm-up period duration based on real-time operating conditions. Rather than using a fixed warm-up period, the control unit adapts the parameters to balance catalyst activation requirements with battery conservation, allowing shorter warm-up periods when conditions permit.
3Object-generated harmful factors
If the engine output is limited to a predetermined value during the warm-up period, then emission standards are met, but the required output value cannot be achieved
Solution Approach 1:
The control unit implements periodic action by temporarily limiting engine output to a predetermined value during the warm-up period, then transitioning to normal output control after the warm-up period ends. This periodic limitation ensures emission compliance during the critical activation phase while allowing full power delivery when the catalyst is active.
Solution Approach 2:
The system performs preliminary action by setting the engine output to a limit value before normal operation begins. This preliminary limitation ensures the catalyst is activated under controlled emission conditions, after which the engine can deliver required power output without compromising emission standards.
4Use of energy by moving object
If the engine is stopped after the warm-up period ends, then battery consumption is reduced, but the catalyst may not be sufficiently activated leading to increased emissions upon re-start
Solution Approach 1:
The control unit uses feedback from engine operating conditions and catalyst temperature to determine whether to continue or stop the engine after the warm-up period. This feedback ensures the catalyst is sufficiently activated before stopping, preventing emission problems upon re-start while avoiding unnecessary continuous operation that would waste battery energy.
Solution Approach 2:
The system allows the catalyst to self-activate during the warm-up period under controlled conditions, then uses the accumulated catalyst activity to maintain emission control during subsequent operation cycles. This self-service approach reduces battery consumption while ensuring the catalyst remains sufficiently active.
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 reduces hazardous substance emissions by maintaining catalyst activity, preventing excessive battery consumption and ensuring emissions comply with regulations.
Implementation Method 1
a warm-up control unit that performs warm-up operation for letting the engine continuously operate while setting an output value of the engine in a predetermined warm-up output value until an integration value of air intake of the engine comes to a predetermined integration value in order to warm up a catalyst provided in an exhaust system
Data Source
AI summary
An engine controller includes: a warm-up control unit that performs warm-up operation for letting the engine continuously operate until an integration value of air intake of the engine comes to a predetermined integration value in order to warm up a catalyst provided in an exhaust system when the engine is first started after start-up of the vehicle; and a continuation control unit that lets the engine continuously operate for a predetermined period subsequent to an end of the warm-up operation. The continuation control unit takes an output value of the engine as a request output value when the request output value of the engine is a predetermined idling output value or more that is smaller than the predetermined warm-up output value and takes the output value as the warm-up output value when the request output value is less than the predetermined idling output value.