Hybrid Vehicle Clutch Control for Pseudo Engine Stall Behavior
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Solution Overview
Problem
Conventional motor torque control devices for hybrid vehicles fail to accurately reproduce the behavior of a conventional manual transmission vehicle during engine stalling, leading to driver confusion between EV and HEV modes.
Innovation Solution
A control device for a hybrid vehicle that includes an EV mode, where the ECU performs pseudo engine stall control by reducing motor torque when the rotational speed falls below the idle rotational speed, and rotation suppressing control to simulate engine stalling, effectively mimicking the behavior of a conventional manual transmission vehicle by engaging the clutch to suppress driving wheel rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MG torque is reduced when motor rotational speed falls below idle rotational speed in EV mode, then the hybrid vehicle can be prevented from being easily started, but the behavior at the time of engine stalling of conventional manual transmission mounted vehicle cannot be reproduced
Solution Approach 1:
The patent applies the copying principle by reproducing the engine stalling behavior of conventional manual transmission vehicles through pseudo engine stall control. The ECU simulates the mechanical stalling sensation by reducing motor torque and suppressing driving wheel rotation, creating a copied experience of conventional vehicle behavior without actual engine mechanical constraints.
Solution Approach 2:
The patent replaces the mechanical engine stalling mechanism with an electronic control system. Instead of relying on physical engine constraints, the ECU uses electronic torque reduction and clutch control to simulate stalling behavior, substituting mechanical system limitations with electronic control functions.
2Ease of operation
If the clutch is engaged to suppress driving wheel rotation during pseudo engine stall control, then the behavior of conventional manual transmission vehicle at engine stalling can be reproduced, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the clutch serve multiple functions: it acts as a power transmission connector during normal HEV mode operation and simultaneously functions as a rotation suppression mechanism during pseudo engine stall control in EV mode. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The patent merges the pseudo engine stall control function with the existing clutch control system. By integrating the rotation suppression function into the clutch control logic, the patent combines multiple control objectives into a unified control mechanism, reducing overall system complexity.
Data Source
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AI summary
[Problem to be Solved] There is provided a control device for a hybrid vehicle that can reproduce behavior of a conventional manual transmission mounted vehicle at the time of engine stalling. [Solution] A control device is to be mounted on a hybrid vehicle including an engine (2), a manual transmission (4) connected to a driving wheel (6), a clutch (7) configured to be switched between an engaged state where power is transmitted between the engine (2) and the transmission (4), and a release state where the power is not transmitted therebetween, and a motor generator (3) to transmit power thereof to the driving wheel (6), a gear stage being switched according to an operation of a clutch pedal (71) and an operation of a shift lever (40) by a driver. The control device includes the control device includes an ECU (10) configured to perform a pseudo engine stall control of reducing a motor torque in a case where a motor rotational speed falls below an MG idle rotational speed in an EV mode, wherein the ECU (10) performs, upon performing the pseudo engine stall control, a rotation suppressing control of suppressing rotation of the driving wheel (6).