Engine-CVT consolidated control using LQI control theory

Takiyama, Takeshi; Morita, Shigeyuki

doi:10.1016/s0389-4304(98)00062-9

Cited by 8 publications

(6 citation statements)

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“…In agreement with [14], the new variable is defined by (46) Differentiation of this relation with respect to time results in with and given by where in all relevant situations. Again in agreement with [14], the control law is chosen as (47) With the choice for the third new variable the closed-loop system is described by…”

Section: Bifurcation and Its Controlmentioning

confidence: 99%

“…ECENT developments in design and control of vehicular powertrains, combined with ever tightening regulations on exhaust emissions, have prompted a renewed interest in the fuel consumption of internal combustion engines (see, for instance, [9], [17], [20], [21], [24], [26], [29], [32], [33], [39], and [46]). The fuel mass flow per unit engine power in stationary situations strongly depends on the operating point, i.e., on the engine speed and the torque or, alternatively, on and the throttle opening .…”

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confidence: 99%

“…Some papers [30], [33] not only take into account the efficiency of the engine but also of other powertrain components (torque converter, transmission, etc.). In this integrated powertrain control [4], [24], [33], [46], [49], the stationary operating points lie on the optimal operating line (OOL), being the set of operating points in which a required power at the wheels is delivered with minimal fuel consumption. 1 The OOL will not completely coincide with the E-line.…”

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confidence: 99%

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Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

Shen

Veldpaus

2004

IEEE Trans. Contr. Syst. Technol.

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Abstract-Vehicular powertrains with an internal combustion engine, an electronic throttle valve, and a continuously variable transmission (CVT) offer much freedom in controlling the engine speed and torque. This can be used to improve fuel economy by operating the engine in fuel-optimal operating points. The main drawbacks of this approach are the low driveability and, possibly, an inverse response of the vehicle acceleration after a kick-down of the drive pedal. This paper analyzes a concept for a novel powertrain with an additional flywheel. The flywheel plays a part only in transient situations by (partly) compensating the engine inertia, making it possible to optimize fuel economy in stationary situations without loosing driveability in transients. Two control strategies are discussed. The first one focuses on the engine and combines feedback linearization with proportional control of the CVT ratio. The CVT controller has to be combined with an engine torque controller. Three possibilities for this controller are discussed. In the second strategy, focusing on control of the vehicle speed, a bifurcation occurs whenever a downshift of the CVT to the minimum ratio is demanded. Some methods to overcome this problem are introduced. All controllers are designed, using a simple model of the powertrain.

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Section: Bifurcation and Its Controlmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

Shen

Veldpaus

2004

IEEE Trans. Contr. Syst. Technol.

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“…All those achievements are contributing to efficiency improvement and jerk reduction. In addition to those studies, various investigations have been carried out to control this gearbox by using various controls, such as proportional-integralderivative (PID) [7], linear-quadratic regulator (LQR) [8], fuzzy control [9], backstepping control [10].…”

Section: Introductionmentioning

confidence: 99%

HIL Evaluation of a Novel Real-time Energy Management System for an HEV with a Continuously Variable Transmission

Taghavipour

Alipour

2021

SV-JME

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One of the most important challenges facing automotive engineers is reducing vehicle fuel consumption and improving the drivability index. Modern hybrid electric powertrains play an important role in reducing fuel consumption. Continuously variable transmission (CVT) is an automatic transmission that can change the gear ratio seamlessly using a belt and pulleys. CVT performs with infinite gear ratios. Controlling and determining the optimal gear ratio, especially in a complex hybrid powertrain, is a major challenge. Therefore, a multi-parametric model predictive controller with real-time implementation capability is proposed that can handle the energy management task concurrently with gear shifting strategy in a parallel pre-transmission hybrid electric vehicle. The proposed controller hardware-in-the-loop (HIL) validation procedure on the high-fidelity Autonomie model shows significant improvement in fuel economy while maintaining drivability in three different driving schedules. HIL evaluation guarantees the real-time capability and the proposed controller readiness to be implemented to real-world control hardware.

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“…An engine-CVT integrated control algorithm has been suggested (Takiyama and Morita, 1999) to compensate for the speed error between the desired speed and the actual speed. For the engine-CVT integrated control, an air-fuel ratio control (Takiyama, 2001), throttle opening compensation (Yasuoka et al, 1999) and engine torque compensation (Kim and Kim, 2001) have been investigated.…”

Section: Introductionmentioning

confidence: 99%

CVT ratio control with consideration of CVT system loss

Ryu

Kim

2008

Int.J Automot. Technol.

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A modified CVT ratio map is proposed to obtain the improved fuel economy for a metal belt CVT. Since the CVT system loss, which occupies most of the drivetrain loss, depends on the engine speed, input torque, primary and secondary actuator pressure, a modified CVT ratio map is produced to realize the highest engine-CVT overall efficiency through the consideration of CVT system loss. The modified CVT ratio map is constructed with respect to the demanded vehicle power and present vehicle speed based on the steady state CVT system loss. Using the modified CVT ratio map, performance simulations are carried out using the dynamic models of the CVT powertrain. The simulation results indicate that the modified CVT ratio control provides improved engine-CVT overall system efficiency, and improves the fuel economy of the federal urban driving schedule by 4.9 percent.

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Engine-CVT consolidated control using LQI control theory

Cited by 8 publications

References 0 publications

Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

HIL Evaluation of a Novel Real-time Energy Management System for an HEV with a Continuously Variable Transmission

CVT ratio control with consideration of CVT system loss

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