Name: cruise control controller designs
Uploaded: 2024-11-21T14:54:16.000Z
Duration: 1 min 22 s
Channel: JoVE

자동차의 크루즈 컨트롤 시스템에는 사고를 방지하기 위해 주변 환경과 운전자의 성능을 모니터링하면서 일관된 속도를 보장하는 필수 컨트롤러 구성이 있습니다.
기존 제어 시스템의 고정 구성 설계에는 보상으로 알려진 사전 결정된 컨트롤러 배치 및 시스템 성능 수정이 포함됩니다.
제어 시스템 보상은 다양한 구성, 일반적으로 캐스케이드 보상을 활용하며, 여기서 컨트롤러는 프로세스와 정렬됩니다.
피드백 보상은 컨트롤러를 사소한 피드백 경로에 배치합니다.
상태 피드백 제어는 제어 신호를 생성하기 위해 일정한 실제 이득을 통해 상태 변수를 피드백하지만 고차 시스템에서는 실용적이지 않을 수 있습니다.
다른 구성으로는 직렬 피드백 및 피드포워드 보상이 있으며, 여기서 피드포워드 컨트롤러는 폐쇄 루프 시스템과 직렬로 배치됩니다.
계열, 피드백 및 상태 피드백은 성능 기준에 제한이 있는 1자유도 컨트롤러 구성입니다. 그들은 매개 변수 변화에 대한 민감도가 좋지 않을 수 있습니다.
반면, 2자유도 구성은 원하는 성능을 달성하는 데 있어 유연성을 향상시킵니다.

컨트롤러 구성

컨트롤러 구성은 도로 상황에 관계없이 일관된 속도를 유지하기 위해 시간이 지남에 따라 속도를 관리하여 설계 목표를 충족하기 때문에 자동차의 크루즈 컨트롤 시스템에서 매우 중요합니다. 기존 제어 시스템에서 고정 구성 설계에는 미리 정해진 컨트롤러 배치가 포함됩니다. 시스템 성능 수정은 보상이라고 합니다.

제어 시스템 보상에는 다양한 구성이 포함되며, 가장 일반적으로는 컨트롤러가 과정과 일치하는 직렬 또는 계단식 보상이 있습니다. 직렬 보상에서 컨트롤러는 플랜트와 직렬로 배치되어 특정 성능 기준을 충족하도록 시스템의 역학을 수정합니다. 반면 피드백 보상은 컨트롤러를 부차 피드백 경로에 배치합니다. 이 방법을 사용하면 기본 피드백 루프에 직접 영향을 미치지 않고도 시스템 동작을 미세 조정할 수 있습니다.

상태 피드백 제어는 일정한 실제 이득을 통해 상태 변수를 피드백하여 제어 신호를 생성합니다. 이 방법은 특정 성능 요구 사항이 있는 제어 시스템을 설계하는 데 효과적입니다. 그러나 상태 변수 측정 또는 추정이 필요하기 때문에 고차 시스템의 경우 비용이 많이 들거나 비실용적일 수 있습니다. 상태 피드백 제어는 폐쇄 루프 극을 원하는 위치에 배치하여 과도 및 정상 상태 성능을 개선하는 것을 목표로 합니다.

다른 구성에는 시리즈 피드백 보상이 포함되며, 이는 시리즈 및 피드백 컨트롤러를 결합하여 두 가지의 이점을 활용합니다. 피드포워드 보상은 피드포워드 컨트롤러를 폐쇄 루프 시스템과 직렬로 배치하여 참조 입력을 직접 처리하여 성능을 향상시킵니다.

앞서 언급한 구성 외에도 컨트롤러 구성의 자유도는 시스템 성능에 상당한 영향을 미칩니다. 시리즈, 피드백 및 상태 피드백은 특정 성능 기준을 충족하는 데 한계가 있는 1자유도(1DOF) 컨트롤러 구성입니다. 이러한 구성은 매개변수 변화에 대한 민감도가 낮거나 계단 응답에서 과도한 오버슈트를 보일 수 있습니다. 반면, 2자유도(2DOF) 구성은 원하는 성능 기준을 달성하는 데 있어 향상된 유연성을 제공합니다. 2DOF 시스템은 피드백 및 참조 추적 경로를 독립적으로 조정할 수 있어 시스템 역학을 더 잘 제어하고 매개변수 변화에 대한 견고성을 제공합니다.

요약하자면, 1DOF 구성은 구현하기가 더 간단하고 쉽지만, 항상 최신 제어 시스템의 엄격한 성능 요구 사항을 충족하지는 못할 수 있습니다. 2DOF 구성의 유연성은 이를 고급 제어 시스템 설계, 특히 정밀한 성능과 견고성이 중요한 자동차 크루즈 컨트롤과 같은 애플리케이션에서 귀중한 도구로 만듭니다.

자동차의 크루즈 컨트롤 시스템에는 주변 환경과 운전자를 모니터링하면서 일관된 속도를 보장하는 필수 컨트롤러 구성이 있습니다.

Education

교육

JoVE Core

Electrical Engineering

전기공학

Unit 1

제1단원

Design of Control Systems

제어 시스템 설계

KEY TERMS AND CONCEPTS

주요 용어 및 개념

Controller Configurations

cruise control controller designs

Cruise control controller designs help a car keep a steady speed over time. They do this by adjusting the system to meet design goals, even when road conditions change. In traditional control systems, a fixed configuration uses a set controller placement.

Control-system compensation means changing the system’s performance. A common form is series, or cascade, compensation. In this setup, the controller is placed in series with the plant, which is the part of the system being controlled. This placement changes the system dynamics so the response better matches the required performance.

Feedback compensation places the controller in the minor feedback path. That lets engineers fine-tune how the system behaves without directly changing the main feedback loop. State-feedback control uses state variables and constant real gains to create the control signal. It can place the closed-loop poles in desired locations, which improves both transient and steady-state performance.

Some controller designs combine methods. Series-feedback compensation uses both a series controller and a feedback controller. Feedforward compensation places the feedforward controller in series with the closed-loop system and acts on the reference input to improve performance. These choices give designers more ways to shape how the system responds.

Controller configurations are also described by their degrees of freedom. Series, feedback, and state-feedback designs are one-degree-of-freedom, or 1DOF, configurations. They are simpler, but they can have limits such as poor sensitivity to parameter changes or too much overshoot in the step response. State-feedback control can also be costly or hard to use for high-order systems because it may require measuring or estimating many state variables.

Two-degree-of-freedom, or 2DOF, configurations give more flexibility. They allow separate tuning of the feedback path and the reference-tracking path. That makes it easier to meet performance goals and improve robustness to parameter variations. For this reason, 2DOF designs are valuable in advanced control systems such as automotive cruise control, where precise performance matters.

Cruise Control Controller Designs

controller configurations

Cruise control controller designs help a car keep a steady speed over time. They do this by adjusting the system to meet design goals, even when road conditions change. In traditional control systems, a fixed configuration uses a set controller placement. Control-system compensation means changing the system’s performance. A common form is series, or cascade, compensation. In this setup, the controller is placed in series with the plant, which is the part of the system being controlled. This...

pd controller: design

PD Controller Circuits for Car Suspension

PD controllers are used in car suspension systems to adjust damping force as road conditions change. A proportional derivative, or PD, controller combines proportional control and derivative control. In proportional control, the output follows the input with a constant gain. This kind of control is common in continuous-data systems that use parts such as adders and integrators, which also appear in proportional, integral, and derivative, or PID, controllers. A feedback control system often...

time-domain interpretation of pd control

PD Control Reduces Overshoot in Motor Torque

PD control helps reduce overshoot and oscillation in motor torque systems. Proportional control uses the size of the error signal to set the correction. When the response is too large or too small, the output can move away from the target and then swing back. With proportional control alone, the system often goes through three stages. First, a positive error signal creates a rapidly rising positive motor torque. That strong push can cause a large overshoot because the system has high force but...

frequency-domain interpretation of pd control

frequency-domain-interpretation-of-pd-control

PD Control Effects on Fan Stability

PD control changes how a fan responds to speed errors. A fan control system can be modeled with a Bode plot, which shows the transfer function across different frequencies. This makes it easier to see how the proportional-derivative controller acts in the frequency domain. The proportional gain, together with the system’s series gain, normalizes the controller gain at zero frequency. The Bode plot also shows that a PD controller works like a high-pass filter. It boosts the high-frequency parts...

pi controller: design

PI Controller Gains and Error Correction

A PI controller uses proportional and integral action to correct error in a control system. PI stands for proportional integral. It is used in modern control systems to improve performance and reduce steady-state error, which is the small error that remains after a system settles. PI controllers are useful in step-input situations such as automatic brightness adjustment on smartphones. They can handle residual steady-state error that the proportional part alone does not remove. Unlike PD...

time and frequency -domain interpretation of pi control

time-and-frequency-domain-interpretation-of-pi-control

PI Control: Zero Placement and Stability

PI control uses proportional and integral action to improve stability and reduce steady-state error in control systems. It is used in everyday devices such as thermostats, where better damping can improve performance. A well-placed zero in the controller transfer function can make the system more accurate and stable. A PI controller also behaves like a low-pass filter. That means it slows the response and can increase settling time. For that reason, the zero should be placed near the beginning...

pid controller

How PID Control Balances System Response

PID controllers are used to balance system response in control systems. They improve stability and performance by adjusting output as the measured value moves away from the desired value. In a thermostat, for example, the controller changes heating or cooling based on the temperature difference between the actual temperature and the set point. In automotive speed systems, it also helps manage sudden speed changes while keeping speed steady under changing conditions. PID control combines the...

phase-lead and phase-lag controllers

Phase Shift Control in Feedback Systems

Phase-lead and phase-lag controllers change how a feedback system responds to different frequencies. A simple stereo equalizer can help explain the idea. Turning up the bass is like using a phase-lead controller, which works like a high-pass filter. Turning up the treble is like using a phase-lag controller, which works like a low-pass filter. PD controllers respond more to high-frequency parts of a signal, so they act like high-pass filters. PI controllers focus more on low-frequency parts...

time and frequency -domain interpretation of phase-lead control

time-and-frequency-domain-interpretation-of-phase-lead-control

Phase-Lead Control for Faster System Response

Phase-lead control improves response speed and stability in control systems. It is often used when a system needs to react faster without losing control. A common example is television screen brightness adjustment. When contrast is enhanced, a phase-lead controller is being used. In a phase-lead system, the first parameter is smaller than the second. The design depends on placing poles and zeros in the right positions. The zero is often moved closer to the origin to speed up the response and...

time and frequency -domain interpretation of phase-lag control

time-and-frequency-domain-interpretation-of-phase-lag-control

Phase-Lag Control for Smoother System Response

Phase-lag control helps a system respond more smoothly and stay stable. It is also used to reduce steady-state error, which is the small difference that can remain after a system settles. A dimmer switch for a light bulb is a simple real-world example. It changes brightness gradually instead of all at once. In control systems, phase-lag control is often described with low-pass filtering. This form is represented when the factor a is less than 1. The controller does not place a pole at zero.

key terms and concepts

Explore cruise control controller designs, including series, feedback, state-feedback, and 2DOF setups that help systems hold speed and improve performance.

Cruise Control Controller Designs | JoVE K12

JoVE Core Electrical Engineering offers easy-to-understand animated videos that cover fundamental concepts of electric circuits along with circuit analysis techniques. It incorporates first-order and second-order circuits using operational amplifiers and circuit transformation concepts. The inclusion of practical design examples and real-world applications through scientist-in-action videos adds significant educational value, making complex concepts accessible.

electrical engineering

Cruise Control Controller Designs

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