EV Torque Control With a Pseudo Clutch Pedal at Low Speed
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Solution Overview
Problem
Existing electric vehicles lack the ability for drivers to control driving torque with the delicacy and situational awareness provided by manual gear shift type internal combustion engines, as they typically only have an accelerator pedal.
Innovation Solution
An electric vehicle system with a pseudo clutch pedal and indicators that allow drivers to control driving torque through a processor, adjusting torque sensitivity based on vehicle speed and pedal operations, and incorporating sound and display cues to simulate a manual gear shift experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only an accelerator pedal is provided in electric vehicles, then the structure is simple, but the driver cannot control driving torque with the delicacy and situational awareness provided by manual gear shift type internal combustion engines
Solution Approach 1:
The pedal system is segmented into two distinct pedals: an accelerator pedal for primary torque control and a pseudo-clutch pedal for secondary torque modulation. This segmentation allows the driver to independently control different aspects of torque delivery, achieving delicate torque control similar to manual transmission vehicles while maintaining a relatively simple overall structure.
Solution Approach 2:
The pseudo-clutch pedal acts as an intermediary control device between the driver and the electric motor torque output. It provides an additional layer of control that modulates the basic torque determined by the accelerator pedal, enabling fine-tuned torque adjustment without requiring a complex multi-speed transmission system.
2Speed
If the sensitivity of driving torque change is high, then the driver can respond quickly to pedal operations, but it becomes difficult to control torque delicately at low speeds
Solution Approach 1:
The system dynamically adjusts the sensitivity of torque change based on vehicle speed. At low speeds, the sensitivity is reduced to enable delicate torque control, while at higher speeds, the sensitivity increases for quicker response. This dynamic adjustment is achieved through the processor modifying the relationship between pedal operation amount and torque output based on real-time speed feedback.
Solution Approach 2:
The control parameters (sensitivity coefficients) are changed based on vehicle speed conditions. The processor selects different torque calculation formulas or adjustment factors depending on whether the vehicle is moving slowly or quickly, allowing the same pedal system to provide both delicate control at low speeds and rapid response at high speeds.
3Adaptability or versatility
If the processor adjusts torque sensitivity based on multiple conditions (vehicle speed, pedal operation speed), then torque control adaptability improves, but the control system complexity increases
Solution Approach 1:
The existing accelerator and clutch pedals are given multi-functional roles. The accelerator pedal determines both basic torque and influences pseudo-clutch engagement characteristics, while the pseudo-clutch pedal provides both clutch-like functionality and torque modulation. This multi-functionality reduces the need for additional dedicated sensors and control mechanisms.
Solution Approach 2:
The system uses feedback from vehicle speed sensors and pedal position sensors to continuously adjust torque output. The processor monitors the operation speed of the pseudo-clutch pedal and vehicle speed, then adjusts the torque sensitivity accordingly, creating a closed-loop control system that adapts to different driving conditions without requiring complex manual intervention.
Data Source
AI summary
An electric vehicle having an electric motor as a driving source, includes: a processor configured to control driving torque to be output by the electric motor; a first indicator; and a second indicator, wherein the processor is configured to: determine a basic torque that is driving torque in a state where the second indicator is not operated, according to the operation amount of the first indicator and a vehicle speed of the electric vehicle; change the driving torque between the basic torque and a minimum torque according to the operation amount of the second indicator; and reduce sensitivity of the change of the driving torque according to the operation amount of the second indicator when a predetermined condition is satisfied.