Electric Assist Motor Load Control for Exhaust Gas Temperature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydraulic working machines increase engine load unnecessarily to burn particulate matter in exhaust gas during non-working states, leading to energy loss and excessive exhaust gas temperature.
Innovation Solution
Incorporating an electric assist motor connected to the engine, an inverter, and a main controller that determines the actuator control valve state and filter clogging to adjust engine load and generate electric power, allowing for precise control of exhaust gas temperature and energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load on the engine is increased to raise exhaust gas temperature for burning particulate matter, then the particulate matter can be burnt, but energy is wasted and the engine suffers unnecessary load during non-working states
Solution Approach 1:
The patent changes the method of increasing engine load from mechanical hydraulic pressure (selector valve closure) to direct electrical load control (electric motor driving). This allows precise control of exhaust gas temperature while recovering energy through regenerative braking, resolving the contradiction between achieving sufficient temperature for particulate matter burning and minimizing energy waste.
Solution Approach 2:
The patent replaces the mechanical hydraulic system (selector valve, hydraulic pump) with an electrical system (electric motor, inverter, controller). This substitution enables more efficient energy management where the electric motor can directly control engine load and recover energy during the exhaust gas heating process, eliminating the energy losses inherent in mechanical hydraulic systems.
2Temperature
If the load on the engine is increased to raise exhaust gas temperature, then the temperature rises above the minimum necessary, but this causes excessive energy loss
Solution Approach 1:
The patent implements a feedback control system where the controller monitors exhaust gas temperature and adjusts the electric motor's driving load accordingly. This closed-loop control ensures the exhaust gas temperature is maintained at the minimum necessary level for particulate matter burning without excessive temperature increase, thereby minimizing energy loss while achieving the required thermal conditions.
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 solution reduces energy loss by recovering energy used to increase engine load and maintains the minimum necessary exhaust gas temperature for burning particulate matter, enhancing energy efficiency and reducing unnecessary load on the engine.
Implementation Method 1
an electric assist motor connected to an output shaft of the engine... generating electric power by the electric assist motor
Implementation Method 2
an inverter for adjusting a torque of the electric assist motor
Implementation Method 3
processing to increase a load acting on the engine such that a temperature of the exhaust gas is raised to a temperature needed to burn the particulate matter
Data Source
AI summary
An exhaust gas temperature raising processing system, which increases a load acting on an engine to raise the exhaust gas temperature, includes an electric assist motor connected to the engine and an inverter for adjusting a torque of the electric assist motor. It also includes a main controller having a first determination unit for determining whether or not an actuator control valve is in a non-feed state and a second determination unit for determining whether or not clogging has occurred on a filter of an exhaust gas purification system. When the non-feed state is determined by the first determination unit and clogging is determined to have occurred on the filter by the second determination unit, the main controller drives the electric assist motor to generate electric power such that a load acting on the engine is increased.