What is the ESP System?

[DiLeo]

esp system is a chassis braking technology developed on the basis of the Anti-lock Braking System (ABS). It mainly consists of a control unit, steering sensor, wheel speed sensor, sideslip sensor, lateral acceleration sensor, etc. The ESP system achieves automatic vehicle safety control, effectively improving the driving stability and safety of the vehicle under dynamic conditions such as braking, driving, and steering. By analyzing the vehicle driving state information transmitted from various sensors, the ESP system then sends correction commands to ABS, EBD, etc., to help the vehicle maintain dynamic balance, achieving automatic vehicle safety control.

[Mila]

After driving for so many years, I place the highest importance on the safety features in a car, and ESP is one of the most crucial among them. Simply put, it's like an invisible bodyguard that steps in immediately when the car starts to skid or lose control. Once, while taking a high-speed turn on a rainy day, I clearly felt the wheels drifting, but the ESP system instantly intervened, automatically applying slight braking to the outer wheels to slow down, and the car immediately stabilized its trajectory. The principle is that it uses the steering wheel angle sensor to determine the direction you intend to go, combines data from wheel speed sensors, yaw sensors, and more, and then uses a computer to analyze the car's actual movement in real time. If it detects that the car is about to oversteer or understeer, it will brake a specific tire to help correct the direction. Nowadays, almost all cars priced above 100,000 yuan come with this feature, making driving in rain or snow much more reassuring.

[SanWeston]

When repairing cars, we often encounter owners asking about the ESP warning light being on. In fact, ESP stands for Electronic Stability Program, and its core function is to prevent skidding and loss of control. When the system detects that the vehicle's direction of travel does not match the steering wheel's turning angle, it takes over control. For example, during a sharp turn if the rear of the car swings outward, it immediately brakes the inner rear wheel; if the front pushes outward, it brakes the outer front wheel. The key components are the steering wheel angle sensor and wheel speed sensors. Any issues with these sensors or their signal wires can cause the warning light to illuminate. For such faults, it's best not to attempt repairs yourself; using a diagnostic tool to read the fault codes is necessary to accurately locate the problem.

[StMadison]

I consider ESP a must-have feature when choosing a car. Its value becomes apparent in critical moments: like when swerving abruptly to avoid a pedestrian darting out suddenly, or slamming on the brakes on slippery roads—these emergency situations are when losing control is most likely. At such times, ESP instantly intervenes by automatically adjusting brake force and engine output to bring the vehicle back under control. Actual test data shows that vehicles equipped with ESP as standard can reduce the risk of single-vehicle accidents by 32%. While you might not feel its presence during normal driving, like airbags, it's better to have it and never need it than to need it and not have it.