Vehicle Controller Crankshaft Torque Resolution via Hilbert Transform
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Solution Overview
Problem
Existing vehicle control systems face limitations in calculating engine torque due to resolution constraints from the angular velocity of the crankshaft, which can lead to insufficient precision and increased resonance effect torque, affecting engine control and combustion efficiency.
Innovation Solution
A controller system that uses a Hilbert process to derive the rotation angle of the crankshaft by smaller specified angles, calculating engine inertia torque and resonance effect torque, and summing them to improve torque resolution and reduce resonance impact, thereby enhancing engine torque calculation and combustion monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the crank angle is obtained by each predetermined angle, then the measurement process is simple, but the resolution of the engine inertia torque is limited
Solution Approach 1:
The patent replaces the mechanical measurement system with signal processing. Instead of using a high-resolution mechanical encoder, the system uses a simple sensor combined with Hilbert transform and differentiation to generate high-resolution torque data from low-resolution crank angle signals.
Solution Approach 2:
The patent changes the parameter representation from discrete crank angle positions to continuous angular velocity and acceleration through mathematical transformation. The Hilbert transform converts position data to velocity data, and differentiation converts velocity to acceleration, enabling high-resolution torque calculation.
2Measurement precision
If the engine torque calculation uses the time derivative of crankshaft angular velocity, then the calculation method is straightforward, but the torque resolution is insufficient due to limited angular velocity measurement precision
Solution Approach 1:
The patent replaces mechanical angular velocity measurement with signal processing. The Hilbert transform extracts instantaneous frequency (angular velocity) from the crank angle signal, and differentiation provides angular acceleration, achieving high precision without additional mechanical sensors.
Solution Approach 2:
The patent performs preliminary signal processing by applying the Hilbert transform to the crank angle signal before differentiation. This preprocessing step converts position data into a form that enables high-resolution velocity and acceleration calculation, improving the quality of subsequent torque computation.
3Measurement precision
If the resonance effect torque is not compensated, then the control system is simpler, but the engine control precision deteriorates due to resonance disturbances
Solution Approach 1:
The patent extracts the resonance effect torque as a separate component from the total measured torque. By identifying and isolating the resonance portion, the system can compensate for it specifically, improving torque measurement precision without requiring complete redesign of the control system.
Solution Approach 2:
The patent implements feedback control by calculating the resonance effect torque based on measured angular acceleration and system parameters, then using this information to compensate the total torque measurement. This closed-loop approach continuously corrects for resonance disturbances.
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 improved engine torque calculation with higher resolution allows for better combustion efficiency and reduced resonance disturbances, enabling more precise control of the engine and monitoring of combustion states.
Implementation Method 1
a first rotation angle deriving process that derives a value of a rotation angle of the crankshaft by each specified angle that is smaller than the predetermined angle by performing a Hilbert process on the detection signal from the first sensor
Implementation Method 2
When the engine torque varies, the damper may generate torsional vibration, and resonance resulting from the torsional vibration may be generated in the input shaft of the drive force transmitting device
Implementation Method 3
resonance resulting from the torsional vibration may be generated in the input shaft of the drive force transmitting device
Data Source
AI summary
A controller performs a rotation angle deriving process that derives a value of the rotation angle of a crankshaft by each specified angle that is smaller than a predetermined angle by performing a Hilbert process on a detection signal from a crankshaft sensor, an angular velocity deriving process that derives an angular velocity of the crankshaft as an engine angular velocity from the value of the rotation angle of the crankshaft by each specified angle, an inertia torque calculation process that calculates an engine inertia torque from the engine angular velocity, a resonance effect torque calculation process that calculates a resonance effect torque, and an engine torque calculation process that calculates a sum of the resonance effect torque and the engine inertia torque as an engine torque that is an output torque of the engine.