Engine Control Device for Electric Mechanical Supercharger Ratio
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Solution Overview
Problem
Existing engine control systems lack a method to optimally transfer supercharging source from electric superchargers to mechanical superchargers, as the operating ranges of both types of superchargers differ, leading to suboptimal performance and limited electric power supply for electric superchargers.
Innovation Solution
An engine control device that adjusts the ratio of supercharging pressures between electric and mechanical superchargers based on the remaining battery charge, using a dynamo-electric machine, secondary battery, electric supercharger, mechanical supercharger, and electronically controlled wastegate valve to manage the transition and maintain maximum performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric supercharger is used to supercharge intake air, then the supercharging pressure can be arbitrarily controlled irrespective of engine operating state, but a considerable amount of electric power is required which limits the operating range
Solution Approach 1:
The system dynamically switches between electric supercharger and mechanical supercharger based on battery charge state and engine operating conditions. The supercharge control means adjusts the ratio of supercharging pressures between electric and mechanical superchargers according to remaining battery charge, enabling adaptive operation that optimizes both control flexibility and energy efficiency
Solution Approach 2:
The system changes the operating parameters by adjusting the supercharging pressure ratio between electric and mechanical superchargers based on battery charge level. When battery charge is sufficient, electric supercharger operates at higher pressure ratio; when charge is low, mechanical supercharger takes over to reduce electric power consumption
2Use of energy by moving object
If the supercharging source is transferred from electric supercharger to mechanical supercharger, then the electric power consumption is reduced, but the operating range of the mechanical supercharger is limited
Solution Approach 1:
The system merges the operations of electric supercharger and mechanical supercharger by controlling both simultaneously with different supercharging pressure ratios. This combination allows the system to leverage the advantages of both types: electric supercharger provides flexible control while mechanical supercharger reduces energy consumption, achieving both goals together rather than choosing one or the other
3Loss of energy
If the wastegate valve is opened to reduce exhaust gas pressure during regeneration, then the pumping loss is reduced and kinetic energy is efficiently utilized, but the supercharging pressure control becomes more complex
Solution Approach 1:
The supercharge control means uses feedback from battery charge state detection to adjust the wastegate valve opening and supercharging pressure ratios. The remaining charge detecting means provides continuous feedback on battery charge level, enabling the control system to dynamically adjust wastegate opening to optimize both energy recovery during deceleration and supercharging pressure maintenance during operation
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 solution allows for maximum performance of both superchargers by monitoring battery charge and adjusting supercharging pressures, ensuring efficient operation within the electric supercharger's range and seamless transition to mechanical supercharging, preventing battery exhaustion and maintaining consistent engine output.
Implementation Method 1
a dynamo-electric machine configured to generate electric power by rotation of the engine
Implementation Method 2
a secondary battery configured to store the electric power generated by the dynamo-electric machine
Implementation Method 3
an electric supercharger including an electric compressor disposed in the intake passage and configured to supercharge intake air into the combustion chamber by the electric power stored in the secondary battery
Implementation Method 4
a mechanical supercharger including an exhaust turbine disposed in the exhaust passage and configured to be driven by exhaust gas in the exhaust passage
Implementation Method 5
a mechanical compressor disposed in the intake passage and configured to supercharge intake air into the combustion chamber
Implementation Method 6
a wastegate valve for adjusting the amount of exhaust gases into the turbine by partially diverting exhaust gases
Data Source
AI summary
An engine includes a dynamo-electric machine which generates electricity by the rotation of the engine; a secondary battery which stores electricity generated by the dynamo-electric machine; an electric supercharger including an electric compressor for supercharging intake air into combustion chambers; and a mechanical supercharger including an exhaust turbine configured to be driven by exhaust gas in the exhaust passage, and a mechanical compressor configured to supercharge intake air into the combustion chamber. An ECU (50) includes a remaining charge detector for detecting the remaining amount of charge of the secondary battery; and a supercharge control means for adjusting the ratio between a supercharging pressure by the electric supercharger and a supercharging pressure by the mechanical supercharger according to the remaining amount of charge of the secondary battery.