Hybrid Vehicle Control Device Single Shift Mechanism Operation
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Solution Overview
Problem
In hybrid vehicles, if one shift mechanism is not in an in-gear state, the vehicle cannot travel, as existing control devices require both shift mechanisms to be engaged for operation.
Innovation Solution
A control device that includes an internal combustion engine and an electric motor, with a transmission system and a control unit that allows the vehicle to travel using only one shift mechanism by starting the internal combustion engine with the electric motor when none of the shift gears in the first shift mechanism are engaged, and transferring power to the second shift mechanism, enabling gear shifting even when the first shift mechanism is not engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both shift mechanisms are required to be engaged for vehicle operation, then the vehicle can operate reliably with complete power transfer capability, but the vehicle cannot travel when one shift mechanism is not in an in-gear state
Solution Approach 1:
The control device determines the engagement state of shift gears in advance before vehicle operation. When a shift gear is not engaged, the control device proactively prevents power transfer to the corresponding input shaft by controlling the clutch state, rather than waiting for power transfer issues to occur. This preliminary detection and prevention ensures reliable operation while allowing the vehicle to travel using the other shift mechanism.
Solution Approach 2:
The clutch (first power transfer element) acts as an intermediary between the internal combustion engine and the first input shaft. By controlling the clutch engagement state based on the engagement status of shift gears, the system mediates power transfer to prevent unwanted power flow when a shift mechanism is not engaged, enabling the vehicle to operate using only the second shift mechanism when necessary.
2Adaptability or versatility
If power transfer is prevented when one shift mechanism is not engaged, then the vehicle can travel using the other shift mechanism, but unnecessary power transfer control complexity increases
Solution Approach 1:
The control device utilizes existing sensors and control systems to detect the engagement state of shift gears and automatically adjusts clutch engagement accordingly. The system serves itself by using its own diagnostic capabilities to determine when to modify power transfer, without requiring additional complex control mechanisms or external intervention. This self-service approach enables operational flexibility while keeping control complexity manageable.
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 the hybrid vehicle to travel using only one shift mechanism, preventing unnecessary power transfer and ensuring reliable operation by setting the first shift mechanism to an off-gear state before starting the internal combustion engine, thus overcoming the limitation of requiring both shift mechanisms to be in-gear for vehicle movement.
Implementation Method 1
an electric motor (3) serving as power sources... starts the internal combustion engine (2) with the first input shaft (IMS) using the electric motor (3)
Implementation Method 2
a first power transfer element (C1)... a second power transfer element (C2)... the power is transferred from the internal combustion engine (2) to the second shift mechanism (G2) when the second power transfer element (C2) is fastened
Data Source
AI summary
A control device in a hybrid vehicle in which control is performed so that the hybrid vehicle can travel using only one shift mechanism from two shift mechanisms is provided. The control device in the hybrid vehicle includes: a transmission including: a first input shaft connected to a motor and optionally connected to an engine; a second input shaft optionally connected to the engine; an output shaft configured to output to power to drive wheels; a first shift mechanism including a plurality of shift gears optionally coupled to the first input shaft; and a second shift mechanism including a plurality of other shift gears optionally coupled to the second input shaft; and an electronic control unit (ECU), wherein the ECU starts the engine with the first input shaft using the motor if none of the shift gears in the first shift mechanism is engaged when the engine is not operating.