Crankcase Sensor Mounting for V-Type Engine Angular Velocity
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Solution Overview
Problem
In V-type 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 detect angular velocity with high precision.
Innovation Solution
A detection sensor is mounted on the crankcase, positioned below the virtual horizontal plane, facing the trajectory of a to-be-detected body, and generates a pulse signal in response to its movement, avoiding electromagnetic interference from the generator and other components, and is protected by the oil cooler, exhaust pipe, and oil filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the generator acts as a ring gear and is disposed at the shaft end of the crankshaft, then the structure is simplified, but the run-out of the crankshaft increases and detection precision deteriorates
Solution Approach 1:
The detection sensor is extracted from the generator assembly and mounted separately on the crankcase. This separates the detection function from the generator, allowing the generator to serve as a ring gear without compromising detection precision. The sensor is positioned at a location where it can detect the to-be-detected body on the crankshaft without being affected by generator-induced run-out.
2Measurement precision
If the detection sensor is mounted on the crankcase at a position below the virtual horizontal plane, then detection precision is improved, but the sensor is exposed to external debris and electromagnetic interference
Solution Approach 1:
The oil cooler is positioned between the detection sensor and the external environment, serving as a protective intermediary. It shields the sensor from external debris while allowing the sensor to maintain its optimal detection position below the virtual horizontal plane. The exhaust pipe also acts as a protective barrier against debris.
3Measurement precision
If the detection sensor is positioned to face the trajectory of the to-be-detected body, then detection precision is improved, but the sensor dimensions and crankcase size increase
Solution Approach 1:
The detection sensor is mounted on the front face of the crankcase at a position below the virtual horizontal plane, utilizing the vertical dimension rather than extending the crankcase length. This allows the sensor to face the trajectory of the to-be-detected body without increasing the overall crankcase dimensions, as the sensor is integrated into the existing crankcase structure.
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
Enables high-precision detection of crankshaft angular velocity, protects the sensor from electromagnetic interference and external debris, and avoids increasing the dimensions of the crankcase, ensuring reliable and accurate measurements.
Implementation Method 1
a detection sensor that is mounted from an outside at a position, lower than the virtual horizontal plane, of a front face of the crankcase that receives air flow, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body
Data Source
AI summary
An internal combustion engine includes a crankshaft that is rotatably supported on the crankcase, a cylinder block that is joined to the crankcase and defines 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 an outside at a position, lower than the virtual horizontal plane, of a front face of the crankcase that receives air flow, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body. Thereby provided is a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision in a so-called V-type internal combustion engine.