Hybrid Vehicle Drive Force Mapping for Altitude Compensation
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Solution Overview
Problem
The requested driving force of hybrid vehicles cannot be effectively determined in existing systems, leading to issues such as prolonged idle traveling distance when the accelerator pedal is pressed due to engine torque attenuation at high altitudes or high temperatures.
Innovation Solution
A method and device for determining the requested driving force in hybrid vehicles by acquiring gear status, current vehicle velocity, accelerator pedal opening, and altitude data, using driving force mapping information to calculate the driving force based on these conditions, including specific tables for different drive modes and altitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If table look-up method based on accelerator pedal opening and engine revolution speed is used to obtain torque request, then the process is simple, but it is not suitable for hybrid vehicles where engine may be shutdown and transmission ratio becomes invalid
Solution Approach 1:
The patent dynamically adjusts the torque determination method based on vehicle operating conditions. Instead of using a fixed table look-up method, the system dynamically selects between different torque calculation approaches depending on whether the engine is running, the vehicle speed, and the accelerator pedal position, making the control system adaptable to various hybrid vehicle modes including engine shutdown conditions
Solution Approach 2:
The patent changes the parameters used for torque determination based on operating conditions. When engine is shutdown or at low speeds, it switches from using engine revolution speed and transmission ratio to using vehicle speed and accelerator pedal opening directly, thereby adapting to conditions where traditional parameters become invalid
2Ease of operation
If engine torque is used to determine driving force, then the calculation is straightforward, but at high altitudes or high temperatures engine torque attenuates causing prolonged idle traveling distance when accelerator pedal is pressed
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor vehicle speed, accelerator pedal opening, and operating conditions. Based on this feedback, the system adjusts the requested torque calculation to compensate for engine torque attenuation at high altitudes or temperatures, ensuring accurate driving force determination regardless of environmental conditions
Solution Approach 2:
The patent performs preliminary determination of requested torque based on vehicle speed and accelerator pedal opening before engine torque is applied. This preliminary calculation ensures that the correct driving force is requested even before accounting for potential engine torque attenuation due to environmental factors
Data Source
AI summary
A determination method for a drive force to be requested for a hybrid vehicle, and an apparatus. The determination method comprises the following steps: obtaining a gear state, a current vehicle speed, a current gas pedal degree of engagement, and drive force mapping information of a vehicle, the drive force mapping information indicating a correspondence relationship between vehicle speed, gas pedal degree of engagement, and drive force; if the gear state is such that the vehicle is not in park gear or neutral gear, obtaining a driving mode and altitude data of the vehicle; and if the altitude data is less than a preset altitude, determining a drive force to be requested for the vehicle on the basis of the current vehicle speed, the current gas pedal degree of engagement, the driving mode, and the drive force mapping information.