Hybrid Power Control Module Battery Protection During Gear Shifts
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Solution Overview
Problem
Existing power output apparatuses do not adequately manage power input and output to batteries during gear ratio changes, leading to potential excessive power input or output due to delayed detection of rotation speed by sensors, which can cause imbalances in the accumulator unit's charge-discharge state.
Innovation Solution
A power output apparatus with a control module that regulates the power generation structure, motor, and change speed transmission mechanism to maintain the accumulator unit's charge-discharge state within a safe range by adjusting the gear ratio change rate and hydraulic pressure supply, ensuring power equivalence to the driveshaft demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gear ratio changeover is performed rapidly to improve responsiveness, then the power output responsiveness is improved, but the charge-discharge state of the accumulator unit deviates excessively due to delayed sensor detection
Solution Approach 1:
The control module detects the start of gear ratio changeover in advance and preliminarily adjusts the motor's rotation speed before the actual changeover completes. This preliminary action compensates for the sensor detection delay, ensuring the accumulator unit's charge-discharge state remains within the allowable range even during rapid changeover.
Solution Approach 2:
The control module continuously monitors the accumulator unit's charge-discharge state and uses this feedback to dynamically adjust the motor's rotation speed during gear ratio changeover. This closed-loop feedback control ensures responsive changeover while maintaining reliable charge-discharge state management.
2Productivity
If the rotation speed of the motor is changed rapidly during gear ratio changeover, then the power transmission efficiency is improved, but excessive power input or output to the battery occurs
Solution Approach 1:
The control module dynamically changes the rotation speed parameter of the motor during gear ratio changeover based on the detected charge-discharge state of the accumulator unit. By adjusting this parameter in real-time, the system maintains high power transmission efficiency while preventing excessive power input or output to the battery.
3Measurement precision
If delayed detection of motor rotation speed is corrected by faster sensing, then measurement accuracy is improved, but the complexity of the detection system increases
Solution Approach 1:
The control module acts as an intermediary that receives the delayed sensor signal and compensates for the delay by calculating and applying appropriate rotation speed adjustments. This intermediary approach maintains measurement precision without requiring complex hardware modifications to the detection system itself.
Data Source
AI summary
The technique of the invention is applied to a motor vehicle where an engine and a first motor are linked to a driveshaft via a planetary gear mechanism, a second motor is linked to the driveshaft via a transmission, and a battery is arranged to receive and transmit electric power from and to the first motor and the second motor. In response to a deviation of the charge-discharge state of the battery from an allowable control range set as an allowable charge state range of the battery during an upshift, gear change control of the invention sets a gearshift condition change flag F1 to 1 (step S360) and sets a value N2 having a smaller absolute value than a value N1 to a target rotation speed change ΔNm2* of the second motor (step S380). The gear change control then sets a hydraulic pressure command Pb1* of a brake B1 included in the transmission to make an actual rotation speed change ΔNm2 of the second motor approach to the target rotation speed change ΔNm2* (step S400). This arrangement reduces a rate of change in rotation speed Nm2 of the second motor. The reduced rate of change in rotation speed Nm2 prevents a continuous decrease or a continuous increase in power consumption of the second motor that is caused by, for example, delayed detection, delayed computation, and delayed communication, thus effectively protecting the battery from excessive power input and excessive power output.