Engine Controller Torque Suppression During Supercharged Shift-Up
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Solution Overview
Problem
In internal combustion engines with superchargers and multi-stage automatic transmissions, existing controllers struggle to efficiently manage torque during shift-up operations, leading to increased shift shock and reduced combustion efficiency due to slow boost pressure adjustments.
Innovation Solution
A controller with a first torque suppressor that retards ignition timing and a second torque suppressor, including a regenerative device coupled to the supercharger, which regenerates rotational energy to quickly decrease torque during shift-up, thereby reducing boost pressure and enhancing combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If drive control is performed to open the control valve during shift-up to decrease boost pressure, then torque-down control is achieved, but the response speed is slow and combustion efficiency deteriorates
Solution Approach 1:
The torque suppression function is divided into two independent pathways: (1) ignition timing retarding controller that directly retards ignition timing to suppress torque, and (2) throttle-valve closing controller that closes the throttle valve to suppress torque. This segmentation allows the system to select the most appropriate control method based on operating conditions, achieving both fast response and maintained combustion efficiency.
Solution Approach 2:
The system changes the control parameter from boost pressure adjustment (slow response) to direct torque suppression parameters (ignition timing and throttle valve opening degree). By directly controlling ignition timing and throttle valve position, the system achieves rapid torque suppression without the intermediate step of boost pressure adjustment, thereby improving response speed while maintaining combustion efficiency through optimized ignition timing control.
2Force
If ignition timing is retarded to perform torque-down control, then torque is decreased, but combustion efficiency deteriorates due to prolonged retardation
Solution Approach 1:
The system dynamically adjusts ignition timing based on real-time operating conditions during shift-up. Rather than applying fixed or prolonged retardation, the ignition timing retarding controller continuously monitors engine parameters and adjusts the timing to achieve sufficient torque suppression while minimizing the duration and extent of retardation. This dynamic control maintains combustion efficiency while achieving the necessary torque-down effect.
Solution Approach 2:
The controller implements feedback control by continuously monitoring engine torque, boost pressure, and combustion parameters during shift-up operations. Based on this feedback, the ignition timing retarding controller adjusts the timing retardation in real-time, increasing retardation when torque suppression is needed and reducing it when torque recovery is appropriate. This feedback mechanism ensures that ignition timing is retarded only as much as necessary, preserving combustion efficiency.
3Force
If boost pressure is decreased by opening the control valve, then torque-down control is achieved, but shift shock increases due to slow pressure adjustment
Solution Approach 1:
The controller performs preliminary torque suppression actions at the onset of shift-up by immediately retarding ignition timing or closing the throttle valve. This preliminary action rapidly reduces torque before the shift completes, preventing the transmission and drivetrain components from experiencing sudden torque changes. By acting in advance and directly on torque rather than indirectly through slow boost pressure adjustment, the system minimizes shift shock while achieving effective torque-down control.
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
The solution enables rapid torque reduction and boost pressure adjustment, minimizing shift shock and improving combustion efficiency by shortening ignition timing retardation and utilizing regenerative energy to assist in supercharging operations.
Implementation Method 1
a regenerative device that regenerates rotational energy of the coupled compressor or turbine
Implementation Method 2
an ignition-timing retarding controller that performs control to retard an ignition timing
Implementation Method 3
a throttle-valve closing controller that performs control to reduce an opening degree of a throttle valve
Implementation Method 4
a supercharging operation for boosting an intake air is performed
Implementation Method 5
a compressor and a turbine of the supercharger are rotatably provided in an intake passage and an exhaust passage, respectively
Data Source
AI summary
A controller for an internal combustion engine includes a regenerative device and at least one of ignition timing circuitry and opening degree circuitry. The ignition timing circuitry is configured to retard an ignition timing so as to decrease a torque generated by the internal combustion engine in a shift-up operation of a multi-stage automatic transmission during a supercharging operation by a supercharger. The opening degree circuitry is configured to reduce an opening degree of a throttle valve so as to decrease a torque generated by the internal combustion engine in a shift-up operation of a multi-stage automatic transmission during a supercharging operation by a supercharger. The regenerative device is coupled to a compressor or a turbine of the supercharger to regenerate rotational energy in the compressor or the turbine so as to decrease the torque in the shift-up operation during the supercharging operation.