Engine Torque Control via Independent Sequence Controller
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Solution Overview
Problem
Integrated starter generator (ISG) systems face communication delays and increased processing loads in engine starting due to the need for simultaneous control of motor-generator and starter motor, leading to potential engine starting performance deterioration.
Innovation Solution
A system with a main controller and a sequence controller, where the sequence controller independently controls the rotary electric machine based on measured rotation parameters, reducing communication traffic and processing load, and optimizing torque application through predetermined control sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main controller controls both the motor-generator and starter motor during engine starting, then the engine starting control can be coordinated, but the processing load of the main controller increases and communication delays occur
Solution Approach 1:
The control system is divided into two independent controllers: the main controller handles fuel injection and ignition timing, while the sequence controller specifically handles motor-generator and starter motor control. This segmentation distributes the processing load and eliminates communication delays between controllers during critical starting operations.
Solution Approach 2:
A sequence controller is introduced as an intermediary device that receives trigger signals from the main controller and independently executes the torque control sequences for the motor-generator and starter motor. This intermediary handles the complex starting control logic separately from the main controller's fuel and ignition management.
2Ease of operation
If the main controller handles all control functions during engine starting, then centralized control is achieved, but communication delays deteriorate starting performance
Solution Approach 1:
Control functions are segmented between the main controller (fuel injection, ignition timing) and the sequence controller (motor-generator and starter motor control). This allows parallel execution of control tasks without communication delays, reducing overall starting time while maintaining coordinated control.
Solution Approach 2:
The sequence controller is pre-programmed with the torque control sequence for the motor-generator and starter motor. When triggered by the main controller, it immediately executes the predetermined control sequence without requiring real-time communication or processing delays.
3Adaptability or versatility
If multiple software program instructions are installed in the main controller for motor-generator control, then comprehensive control capability is achieved, but the number of calibration processes increases
Solution Approach 1:
The complex software program for motor-generator torque control is extracted from the main controller and transferred to the sequence controller. The main controller retains only essential functions (fuel injection, ignition timing), while the sequence controller handles the specialized torque control logic, reducing overall system complexity.
Solution Approach 2:
The torque control sequence is implemented as a predetermined program in the sequence controller that can be independently calibrated and executed. This copying of control logic to a dedicated controller simplifies the main controller's software while maintaining comprehensive control capability through the sequence controller's specialized program.
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 configuration enhances engine starting performance by reducing communication delays and processing loads, improving the efficiency of torque control and reducing software program complexity, while minimizing noise and wear on engine components.
Implementation Method 1
a rotation parameter detector configured to measure a rotation parameter associated with rotation of the rotor of the rotary electric machine
Data Source
AI summary
In a system for controlling rotation of torque applied to a rotating shaft of an engine of a vehicle that uses the engine as a drive source thereof, a motor is provided. A main controller controls the engine and the motor. The main controller selectably activates the motor that applies first torque to the rotating shaft of the engine, and deactivates the motor. A rotary electric machine includes a rotor connected to the rotating shaft of the engine. A rotation parameter detector measures a rotation parameter associated with rotation of the rotor of the rotary electric machine. A sequence controller performs, in response to an occurrence of a trigger situation, a control sequence that controls, independently of the main controller, the rotary electric machine based on the rotation parameter measured by the rotation parameter detector, thus applying second torque to the rotating shaft of the engine.