汽车应用领域

此示例说明如何结合使用 Stateflow® 和 Simulink® 来高效地进行混合系统建模。这种类型的建模对于具有基于离散事件的多种可能运行模式的系统特别有用。传统的信号流在 Simulink 中处理，而控制配置的更改在 Stateflow 中实现。下面所述的模型表示汽油引擎的燃油控制系统。该系统具有很强的稳健性，因为它可以检测到单个传感器的故障，并且可以动态重新配置控制系统以实现不间断运行。

Use data dictionaries to manage the data for a fuel rate control system designed using Simulink® and Stateflow®.

Model a four-cylinder spark ignition internal combustion engine from the throttle to the crankshaft output using triggered subsystems. In this example, the sldemo_engine model is based on [1].

Enhance a version of the open-loop engine model described in Model Engine Timing Using Triggered Subsystems. This model, sldemo_enginewc, contains a closed-loop and shows the flexibility and extensibility of Simulink® models. In this enhanced model, the objective of the controller is to regulate engine speed with a fast throttle actuator, such that changes in load torque have minimal effect. This is easily accomplished in Simulink by adding a discrete-time PI controller to the engine model.

Use Simulink® to model and simulate a rotating clutch system. Although modeling a clutch system is difficult because of topological changes in the system dynamics during lockup, this example shows how enabled subsystem can easily handle such problems. We illustrate how to employ important Simulink modeling concepts in the creation of the clutch simulation. Designers can apply these concepts to many models with strong discontinuities and constraints that may change dynamically.

Use If/Else subsystems to build a clutch model. An 'If' subsystem models the clutch dynamics in the locked position while an 'Else' subsystem models the unlocked position. One or the other is enabled using the 'If' block. The dot-dashed lines from the 'If' block denote control signals, which are used to enable If/Else (or other conditional) subsystems. Checking any of the boxes on the GUI produces a plot of any of the selected variables (versus time).

此示例说明如何对一个简单的防抱死制动系统 (ABS) 进行建模。此模型对车辆在紧急制动情况下的动态行为进行仿真。该模型表示单个车轮，可以重复多次以创建多轮车辆的模型。

此示例说明如何对简化的半车模型建模，该模型包括独立的前后垂直悬架系统。该模型还包括车身俯仰和弹跳自由度。该示例提供模型描述，以说明如何使用仿真来研究行驶特征。您可以将此模型与动力总成系统仿真结合使用，以研究节气门设置变化导致的前后喘振。

此示例说明如何用 Simulink® 对汽车传动系统建模。Stateflow® 通过其变速器控制逻辑的表示增强 Simulink 模型。Simulink 为动态系统和过程的建模与仿真提供强大的环境。然而，在许多系统中，监督函数（如更改模式或调用新增益时间表）必须对可能发生的事件和随时间变化的条件作出响应。因此，环境需要一种能够管理这些涉及多种模式和开发条件的语言。在以下示例中，Stateflow 通过在自动变速器中执行挡位选择函数来显示它在这方面的优势。此函数通过在 Simulink 模块图中包含 Stateflow 模块，以自然直观的方式与传动系统动态相结合。

Simulate the electrical system of a vehicle using Simulink® and Simscape™ Electrical™.

此示例说明如何使用 Simulink® 和 Stateflow® 对汽车中自动气候控制系统进行仿真。

Model a vehicle climate control system with an electrical system. Use the model to examine the loading effects of the climate control system on the entire vehicle electrical system.

Use Model-Based Design to implement a power window system for an automobile.

Model a wireless tire pressure monitoring system with fault logging using message communication.