ABS Modulator Block Temperature Control for Hydraulic Braking
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Solution Overview
Problem
Hydraulic power brake systems for larger and heavier vehicles, such as construction machines and agricultural tractors, face challenges with slow switching times and low ABS control frequency due to the need for large magnetic switching valves, which are inefficient and consume high current, and are further hindered by temperature-dependent viscosity of hydraulic oil affecting valve switching speed.
Innovation Solution
Locally arranging temperature sensors and heating elements within ABS modulator blocks near the pilot valves, combined with heat insulation to maintain optimal hydraulic oil viscosity and reduce heat loss, allowing for precise temperature control and improved ABS control frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If large magnetic switching valves are used in hydraulic power brake systems for heavier vehicles, then the braking force capability is improved, but the switching time increases and ABS control frequency decreases
Solution Approach 1:
The patent replaces electromagnetic actuation with hydraulic actuation for the main inlet and outlet valves. The hydraulic pilot valves are controlled by small electromagnetic pilot valves, creating a two-stage control system where electrical signals control hydraulic pressure, which then actuates the main valves. This substitution allows large valves to switch quickly without requiring large electromagnetic actuators.
Solution Approach 2:
The patent uses hydraulic pressure from the vehicle's existing hydraulic system to actuate the inlet and outlet valves. The hydraulic pilot valves receive control pressure from a control pressure main line connected to the hydraulic pressure supply system, enabling fast valve switching through hydraulic pressure rather than direct electromagnetic force.
2Loss of energy
If hydraulic oil temperature decreases, then energy loss is reduced, but hydraulic oil viscosity increases and valve switching speed decreases
Solution Approach 1:
The patent incorporates heating elements that can preheat the hydraulic oil in the ABS modulator block before valve operations. The temperature sensor detects low oil temperature and activates the heating element to maintain optimal viscosity, ensuring fast valve switching is possible even in cold conditions before braking operations begin.
Solution Approach 2:
The patent changes the temperature parameter of the hydraulic oil through heating elements when detected by temperature sensors. By maintaining the oil temperature within an optimal range, the viscosity parameter is kept suitable for fast valve switching, resolving the contradiction between energy conservation and switching speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy and effectiveness of ABS control by maintaining optimal hydraulic oil viscosity, reducing heating power requirements, and ensuring consistent high switching speeds of inlet and outlet valves, thereby improving braking and steering capabilities.
Implementation Method 1
at least one temperature sensor for detecting the oil temperature and at least one heating element for heating hydraulic oil is provided
Implementation Method 2
a hydraulically pressure-controlled inlet valve arranged between the main brake line and the respective axle or wheel brake line and a hydraulically pressure-controlled outlet valve arranged between the respective axle or wheel brake line and a pressureless return line
Implementation Method 3
at least one each inlet and Outlet valve has upstream, electromagnetically actuated pilot valve
Data Source
Figure 1
Figure 2~3a
Figure 3b
AI summary
The invention relates to a hydraulically assisted braking system (1) of a wheeled vehicle, comprising at least one main brake line (20, 21) into which a target brake pressure can be applied by means of a brake valve (4) actuated via a brake pedal (7), and from which at least one axle or wheel brake line (46, 49, 50) leads to an actuating unit (13, 15, 17, 19) of at least one wheel brake (12, 14, 16, 18), as well as a valve arrangement (8) of an ABS control unit, comprising a hydraulically pressure-controlled inlet valve (28, 34, 40) arranged between the main brake line (20, 21) and the respective axle or wheel brake line (46, 49, 50), and a pressureless return line. (51, 52, 53) arranged hydraulically pressure-controlled outlet valve (30, 36, 42) and at least one electromagnetically actuated pilot valve (32, 33, 38, 39, 44) upstream of each inlet and outlet valve,45) comprising at least one temperature sensor for detecting the oil temperature (T) and at least one heating element for heating hydraulic oil, and wherein the inlet and outlet valves as well as the pilot valves of the ABS control unit are each grouped in an ABS modulator block (69) per vehicle unit or per vehicle axle. To improve the operating characteristics of the ABS control unit, according to the invention, at least one temperature sensor (70, 71, 72) for detecting the oil temperature (T) and at least one heating element (73, 74, 75) for heating the hydraulic oil used locally for control are arranged in each ABS modulator block (69).