Straddle-Type Vehicle Exhaust Temperature Control
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Solution Overview
Problem
Straddle-type vehicles with supercharging devices face challenges in minimizing the impact of engine control on traveling feeling due to altered exhaust gas emissions, which can damage catalysts and affect ride quality.
Innovation Solution
A straddle-type vehicle equipped with a supercharging device, catalyst in the exhaust passage, and a control section that performs increase suppressing control to manage exhaust gas temperature, reducing the need for additional sensors and maintaining ride quality by initiating controls before catalyst damage occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine control is performed according to exhaust gas state, then catalyst protection is improved, but traveling feeling is affected
Solution Approach 1:
The control section performs increase suppressing control before the catalyst temperature reaches its permissible limit by estimating the temperature in advance based on engine operating conditions. This preliminary action prevents catalyst damage while minimizing disruption to the rider's traveling experience by avoiding abrupt control interventions.
Solution Approach 2:
The system changes control parameters based on estimated exhaust gas temperature and engine operating conditions. By adjusting control intensity according to temperature estimates and operational context, the system protects the catalyst while maintaining acceptable traveling feeling across different driving scenarios.
2Reliability
If exhaust gas temperature is suppressed, then catalyst damage is prevented, but engine control complexity increases
Solution Approach 1:
The control section uses existing sensor data (throttle opening, engine speed, water temperature) to estimate exhaust gas temperature without requiring additional temperature sensors. This self-service approach prevents catalyst damage while avoiding the complexity of adding new sensing systems.
Solution Approach 2:
The system replaces direct physical measurement of exhaust gas temperature with a computational estimation model based on engine operating parameters. This substitution eliminates the need for complex high-temperature sensing hardware while achieving the same protective function.
3Measurement precision
If additional sensors are added for temperature monitoring, then temperature control precision is improved, but device complexity and cost increase
Solution Approach 1:
The control section leverages data from existing sensors (throttle position, engine speed, cooling water temperature) to calculate and estimate exhaust gas temperature. This approach achieves sufficient measurement precision for catalyst protection without adding any new sensors or increasing device complexity.
Solution Approach 2:
Existing sensors serve multiple functions: they monitor engine operating conditions for normal engine control and simultaneously provide data for estimating exhaust gas temperature to protect the catalyst. This multi-functionality eliminates the need for dedicated temperature sensors.
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 effectively suppresses exhaust gas temperature increases, protecting the catalyst and minimizing the impact of engine control on traveling feeling, while allowing engine control based on exhaust gas state without unnecessary interventions.
Implementation Method 1
a supercharging device which compresses intake-air to be sent to a combustion chamber of an engine
Implementation Method 2
a catalyst provided in an exhaust passage through which an exhaust gas emitted from the engine flows
Implementation Method 3
The control section may estimate whether or not the exhaust gas temperature has exceeded the increase suppressing temperature set to be equal to or lower than the catalyst permissible temperature, based on a value corresponding to a throttle valve opening degree and an engine speed
Data Source
AI summary
A straddle-type vehicle comprises a supercharging device which compresses intake-air to be sent to a combustion chamber of an engine; a catalyst provided in an exhaust passage through which an exhaust gas emitted from the engine flows; and a control section which controls the engine, wherein the control section performs an increase suppressing control for suppressing an increase in an exhaust gas temperature, in a case where the control section estimates that the exhaust gas temperature has exceeded an increase suppressing temperature set to be equal to or lower than a catalyst permissible temperature.