Throttle Valve Opening Ratio for Engine Control
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Solution Overview
Problem
Conventional manual throttle devices in high-output internal combustion engines require skilled operation to achieve compatible engine output and drivability, especially in vehicles with quick throttle operations, leading to inaccurate deceleration control and degraded acceleration response.
Innovation Solution
A control apparatus with an electronic control throttle device that sets the throttle valve opening degree to include a zero output angle between low and high rotational speed regions, using an opening-side angle ratio of 8% to 12% for the throttle operator, ensuring accurate deceleration control and enhanced acceleration response, with features like maintaining a constant output at low speeds and increasing engine power proportionally with rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the opening degree ratio is set below 8%, then deceleration control accuracy is improved, but acceleration response is degraded due to requiring minute operation amounts
Solution Approach 1:
The patent optimizes the opening degree ratio parameter to a specific range (8-12%) to simultaneously achieve accurate deceleration control and fast acceleration response. This parameter adjustment resolves the contradiction by finding the optimal value that balances both requirements without requiring extreme miniaturization of the throttle valve or complex control algorithms.
2Speed
If the opening degree ratio is set above 12%, then acceleration response is improved, but deceleration control accuracy is degraded due to increased operation amount
Solution Approach 1:
The patent establishes the opening degree ratio within the 8-12% range to balance acceleration response and deceleration control accuracy. By setting the throttle valve opening degree to this optimized range, the system achieves both rapid acceleration response and precise deceleration control without requiring excessive throttle operation amounts.
3Device complexity
If a manual throttle device is used in high-output engines, then device simplicity is maintained, but operability requires high skilled ability
Solution Approach 1:
The patent optimizes the throttle valve opening degree parameter to 8-12% to improve ease of operation for riders without requiring skilled ability. This parameter optimization makes the throttle operation more intuitive and easier to control, allowing riders to perform accurate throttle operations in high-output engines without extensive training.
Data Source
AI summary
A control apparatus for an internal combustion engine, includes: a throttle operator; an opening degree detector that detects an operation opening degree of the throttle operator; and an electronic control throttle device that opens and closes a throttle valve disposed in an intake passage of the engine, depending on the operation opening degree detected by the opening degree detector. A throttle valve opening degree of the throttle valve is set to include a zero output throttle opening degree angle at which an output of the engine becomes zero between a low rotational speed region and a high rotational speed region of the engine. The operation opening degree of the throttle operator corresponding to the zero output throttle opening degree angle is set to an opening-side angle ratio that falls within a range between 8% and 12%, both inclusive, with respect to a fully-open opening degree of the throttle operator.