Aiming to address the issue of traction torque arbitration in hybrid transmission vehicles during rapid acceleration and deceleration, a comprehensive analysis is conducted on the impact of different conditions on cruise condition. This paper analyzes the criteria for activating cruise mode, as well as introduces the state machine for cruise control. The calculation of torque requirements for cruise control is then presented, along with the introduction of traction torque coordination modules to mitigate drivability issues during cruise condition. This is followed by optimized calibration and comparative real-world vehicle testing. The test results demonstrate that this calibration method effectively resolves the challenge of excessive drivability performance in acceleration and deceleration, with real-world testing showing actual vehicle speed can rapidly catch up to the set cruise speed, significantly enhancing drivability. The optimization process can increase the time it takes for the actual speed to reach the set speed by 14.2%, and reduce acceleration oscillation to within 4m/s2 by 20%.
To address the issue of complex launch processes in hybrid transmission vehicles during race launches, a design was developed to evaluate the conditions for launch control. The design also includes the control flow design for launch control, which consists of five phases: C0 clutch control, motor control, and drivetrain mode control in the VCU and PCM during specific phases. Ultimately, real vehicle testing has demonstrated that the designed control flow can ensure torque demand from the driver, thereby enhancing driving performance and reliability of the vehicle.
Aiming to address the issue of elevated torque distribution in hybrid transmission vehicles during rapid acceleration and deceleration, a comprehensive analysis is conducted on the impact of different conditions on torque distribution. This paper analyzes the estimation of front axle torque and engine torque in the process of acceleration, as well as the primary factors influencing their distribution. Various calibration strategies are introduced to mitigate drivability issues during high-torque acceleration, followed by optimized calibration and comparative real-world vehicle testing. The test results demonstrate that this calibration method effectively resolves the challenge of excessive drivability performance in acceleration and deceleration, with real-world testing showing vehicle acceleration during the process to be less than 5 m/s², significantly enhancing drivability.
Taking into account the structural characteristics of the dual-motor hybrid powertrain, in the city low-speed operating condition, the vehicle's drive mode during the creeping operation, in order to ensure a smooth and fast vehicle creeping, a highly efficient creeping control method needs to be developed to achieve fast vehicle creeping control. The method was proposed for achieving creep control in a dual-motor hybrid vehicle configuration through power source coordination, following an analysis of the vehicle's configuration. The creep process was segmented into several parts: primary creep force, brake adjustment, and creep force rate control. Real-vehicle testing validated the effectiveness of the control method, with results indicating that during the 6-second creep process, acceleration remained below 1 m/s2 and no power fluctuation occurred throughout the entire switching process.
The research significance of this paper lies in the design of a guiding current for entering the ASC, aiming to prevent overcurrent phenomena during entry. This paper introduces a technique for implementing the active short-circuit function of the electric drive system's software request guidance current control, based on the functional safety considerations of new energy vehicle electric drive systems. The research methodology employs a comparative testing approach, conducting separate experiments to examine the effects of diverting current away from the ASC and directing it into the ASC. Through algorithmic optimization, the amplitude of the id current has been gracefully diminished from 600A to 440A, while the iq current's amplitude has been elegantly reduced from 200A to 100A upon entering ASC mode. The practicality of the proposed control algorithm was confirmed through in-vehicle testing.
In order to tackle the issue of increased clutch surface temperature in hybrid transmission vehicles during heavy load acceleration, a thorough analysis was carried out to examine the impact of acceleration stages on temperature rise. This study investigates the reasons behind excessive heat generation in the clutch during high torque acceleration, as well as the primary factors influencing slip work production. Several calibration strategies are proposed to address overheating problems during high torque acceleration, and optimized calibration along with real-world vehicle testing are also performed for comparison. The results of the tests show that this calibration approach effectively demonstrate a 78.3% improvement in max C0 clutch temperature during transition, ultimately leading to enhanced drivability.
In order to address the issue of motor temperature in hybrid transmission vehicles during uphill acceleration with a heavy load, we conducted a comprehensive analysis on the impact of acceleration on motor temperature rise. Firstly, this study investigates the causes of excessive heat generation in the motor under high torque load, as well as the primary factors contributing to heat production. Secondly, we implemented various calibration strategies to mitigate overheating issues during high torque acceleration. Finally, optimized calibration and real-world vehicle testing were performed for comparison. The test results demonstrate that this calibration method effectively resolves the problem of excessive thermal load during heavy load uphill conditions while also enhancing drivability.
Due to the high economy and drivability performance objectives, the dual-drive hybrid system which has two motors is developed. In the diverse conditions, the drive modes which are on account of the engine status, the requested driver torque and power, C0 status are presented. The unique challenge of the dual-drive hybrid system is drive modes transition. Specifically, the path transition from the electric mode control to parallel mode control in the acceleration and from parallel mode to electric mode in the brake acceleration. The drive mode control process is divided into five control phases. Finally, tests are successfully performed in the real vehicles to prove that the drivability performance are greatly improved and the innovative control strategy is also demonstrated.
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