Crankcase Sensor Mounting for V-Type Engine Angular Velocity Detection
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Solution Overview
Problem
In internal combustion engines, precise detection of crankshaft angular velocity is challenging due to increased run-out of the crankshaft when the generator acts as a ring gear, making it difficult to accurately detect the angular velocity.
Innovation Solution
A detection sensor is mounted on the crankcase, positioned higher than the crankshaft's rotational axis, facing the trajectory of a to-be-detected body, which is integral with the crankshaft, allowing for precise angular velocity detection while avoiding electromagnetic interference and oil splashes, and is placed in a way that does not increase the engine's dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the generator is disposed at the shaft end of the crankshaft to act as a ring gear, then the structure is simplified, but the run-out of the crankshaft increases making it difficult to detect angular velocity with high precision
Solution Approach 1:
The detection sensor is positioned in a different spatial dimension (above the virtual horizontal plane) rather than in the plane of the crankshaft rotation, allowing detection without being affected by the increased run-out. This dimensional relocation enables precise angular velocity detection while maintaining the simplified structure with the generator at the shaft end.
2Measurement precision
If the detection sensor is mounted on the crankcase at a position higher than the virtual horizontal plane, then the angular velocity can be detected with high precision, but the device complexity increases
Solution Approach 1:
The crankcase serves multiple functions: it houses the crankshaft, contains the oil chamber, and provides a mounting surface for the detection sensor. By utilizing the existing crankcase structure, the sensor mounting does not require additional complex support structures, thereby limiting the increase in device complexity while achieving high-precision detection.
3Measurement precision
If the detection sensor is positioned to face the trajectory of the to-be-detected body, then high-precision detection is achieved, but the sensor is exposed to oil splashes
Solution Approach 1:
By positioning the detection sensor above the virtual horizontal plane (in a different vertical dimension), the sensor faces the trajectory of the to-be-detected body without being directly exposed to oil splashes that occur at the crankshaft rotation plane. This dimensional separation maintains detection precision while protecting the sensor from harmful oil exposure.
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 high-precision detection of crankshaft angular velocity, protects the sensor from oil splashes, and maintains the engine's structural integrity without increasing its dimensions, ensuring accurate measurements and efficient operation.
Implementation Method 1
a detection sensor that is mounted from an outside on the crankcase at a position higher than the virtual horizontal plane and is made to face a trajectory of the to-be-detected body to generate a pulse signal in response to movement of the to-be-detected body
Data Source
AI summary
An internal combustion engine includes a crankcase that rotatably supports a crankshaft, a case cover that liquid-tightly covers a side of the crankcase, a cylinder block that is joined to the crankcase and divides a plurality of cylinders in a V-type arrangement in which the cylinders are disposed above a virtual horizontal plane including a rotational axis of the crankshaft and intersect each other at a bank angle, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that is mounted from the outside on the crankcase at a position higher than the virtual horizontal plane and is made to face a trajectory of the to-be-detected body to generate a pulse signal in response to movement of the to-be-detected body. This provides, in a so-called V-type internal combustion engine, a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision.