utomotive suspension systems have seen significant advances in recent years, moving away from conventional
mechanical designs to more sophisticated, electronically controlled, systems. One example of this is Monroe’s Intelligent Suspension RideSense shocks, which are said to be a cutting-edge solution for vehicles with semi- active electronic suspension technology. Designed as a direct replacement for
original equipment shocks, the RideSense shocks offer performance improvements in ride comfort, handling precision, as well as durability and safety. Let’s take a look into the workings of this
advanced suspension systemto understand why it is revolutionising automotive damping.
Electronic shocks, such as the Monroe Intelligent Suspension RideSense, function through an intricate system of sensors and an Electronic Control Unit (ECU). Unlike traditional shocks that rely solely on mechanical components to control damping forces, electronic shocks adjust these forces in real-time by processing data from various sensors. Each Monroe Intelligent Suspension RideSense
shock connects to the vehicle’s ECU, which collects input from three acceleration sensors (two placed at the front of the car and one at
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rear), four suspension position sensors near each wheel, and other critical feedback points such as the rotational angle of steering wheel and the speed of the vehicle. These sensors continuously assess parameters such as wheel acceleration, body displacement and steering angle related to a certain speed. This data enables the system to calculate
optimal damping levels based on road conditions and driving behaviour within a reaction time as fast as 6-12 milliseconds. Through rapid, adaptive adjustments, Monroe Intelligent Suspension RideSense shocks therefore deliver a tailored response that ensures a smoother ride and improved handling.
The RideSense shock features a complex arrangement of tubes, valves and servo components. The system uses a low-pressure three-tube design – a hallmark of advanced shock technology – allowing for seamless oil flow between components. The shock absorber directs oil flow through the Monroe Intelligent Suspension RideSense valve, regulating pressure for both compression and rebound forces consistently – a design idea known as the ‘uniflow principle’. This design enables the shock to react
quickly to changing conditions by directly adjusting oil flow, which in turn modulates the damping force, the company explains.
The control system of Monroe Intelligent Suspension RideSense relies on an ECU that processes data at a rate of 500 checks per second. The ECU uses a range of values to determine the ideal damping level for each shock absorber: • Current levels: The ECU modulates the current between 0.3 A (for softer damping) and 1.6 A (for firmer damping) to the servo valve. This range adjusts the magnetic force applied to the valve, changing the internal pressure and therefore the damping force.
• Sensor inputs: Inputs from acceleration and position sensors provide real-time feedback on the vehicle’s behaviour, allowing the ECU to adjust shock settings for optimal performance.
• Road and driving conditions:The ECU interprets conditions such as road roughness, lane changes and obstacle avoidance manoeuvres, adjusting the damping levels accordingly. The servo valve responds to these signals
by altering oil flow, which adjusts the shock absorber’s internal pressure. This system provides real-time adaptability, ensuring that each wheel maintainsmaximum contact with the road for improved control, comfort and safety.
Monroe’s Intelligent Suspension RideSense
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