Engine Drive System Crankshaft Rotation Control
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Solution Overview
Problem
Internal combustion engine start-up times are delayed due to the need for reverse rotation of the crankshaft, which is typically required to achieve the necessary torque but results in inefficiencies.
Innovation Solution
An engine drive system that includes a processor and control module coupled to a crank sensor system, which determines the load on the crankshaft and controls an electrical machine to rotate in either a forward or reverse direction based on detected load conditions, optimizing start-up by initiating forward rotation during engine start-up and reversing only when high loads are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the crankshaft rotates in reverse direction to achieve large torque during start-up, then the torque requirement is met, but the engine start-up time is delayed
Solution Approach 1:
The system dynamically switches between forward and reverse rotation directions based on real-time load conditions detected by the crank sensor system. The control module adjusts the electrical machine's rotation direction according to the detected crankshaft load, allowing the system to adapt its behavior to current operating conditions rather than following a fixed rotation pattern
Solution Approach 2:
The system changes the rotation direction parameter of the electrical machine based on detected load conditions. When high load is detected, the system switches to reverse rotation to provide necessary torque; when load is low, it uses forward rotation to reduce start-up time. This parameter change resolves the contradiction by making rotation direction conditional rather than fixed
2Loss of time
If the crankshaft rotates in forward direction during start-up, then the engine start-up time is reduced, but the torque required to overcome high load is insufficient
Solution Approach 1:
The crank sensor system continuously monitors crankshaft load and provides feedback to the control module. Based on this feedback, the control module determines whether to switch rotation direction to provide adequate torque. The feedback mechanism ensures that forward rotation is maintained only when load conditions permit, automatically switching to reverse rotation when high load is detected
Solution Approach 2:
The system transitions from a static rotation direction approach to a dynamic one where rotation direction changes based on real-time load detection. The electrical machine's rotation direction is continuously adjusted according to crankshaft load conditions, allowing the system to optimize between start-up time and torque provision
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 reduces engine start-up time by rotating the crankshaft forward during initial start-up and reversing only when high loads are present, thereby optimizing engine start-up efficiency and reducing delays.
Implementation Method 1
an electrical machine coupled to the crankshaft to rotate the electrical machine in one of a forward direction and a reverse direction
Data Source
AI summary
An engine drive system comprises a processor and a control module coupled to the processor. The control module receives a signal from a crank sensor system, the signal being indicative of at least one of a speed and load of a crankshaft. Based on the signal received from the crank sensor system, the control module determines whether a load on the crankshaft is greater than a threshold value. Based on the determination, the control module controls an electrical machine coupled to the crankshaft to rotate the electrical machine in one of a forward direction and a reverse direction.