A heavy-duty vehicle electromagnetic clutch steering assist control system and control method

Abstract

The invention discloses a control system and a control method for power-assisted steering for an electromagnetic clutch of a heavy vehicle. The control system comprises an electromagnetic slip clutch, a control unit, a wheel speed sensor, a torque sensor, a pressure sensor and a power supply circuit, wherein the wheel speed sensor, the torque sensor and the pressure sensor are all connected with the input end of the control unit, the output end of the control unit is connected with the power supply circuit, the power supply circuit is serially connected with the electromagnetic slip clutch, and the electromagnetic slip clutch is arranged between an engine and a steering pump; the control unit calculates a steering resistance moment Ta, a power-assisted slope coefficient k and a power-assisted current I1 according to the information provided by the wheel speed sensor, the torque sensor and the pressure sensor, and conveys the power-assisted current to the power supply circuit; the power supply circuit outputs an excitation current I to the electromagnetic slip clutch according to the power-assisted current I1; and the electromagnetic slip clutch outputs rotational speed information to the steering pump according to the excitation current I. The control system and the control method which are disclosed by the invention give consideration to both convenience of low-speed steering and road feeling during high-speed steering.

Description

technical field [0001] The invention relates to the field of heavy-duty vehicle chassis steering systems and electromagnetic circuits, in particular to a steering main force control system and control method technology applied to a new electromagnetic clutch type hydraulic power steering system (E-ECHPS) of heavy vehicles. Background technique [0002] In the traditional hydraulic power steering system (HPS), the steering pump is directly driven by the engine. It is a simple-designed and easy-to-implement steering assist system, which reduces the burden on the driver when steering to a certain extent. The engine speed is positively correlated, the steering assist is too small at low speeds, and the steering assist is too large at high speeds. At the same time, part of the energy consumption is wasted due to the generation of excess assist. Electro-hydraulic power assist system (EHPS), the steering pump is driven by an independent motor, and its input current is determined by...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the steering system assists too little at low speeds when the above-mentioned vehicles are running, it will cause the driver to struggle to turn, while at high speeds the steering system will have too much assist, which will cause the driver to lose the sense of the road, which is not conducive to steering at high speeds. To solve problems such as vehicle stability and driving safety, the present invention provides a steering assist control system and control method for the E-ECHPS power steering system excitation ESC at normal driving speeds, by changing the current of the excitation circuit, and then changing the power assist Size, so as to achieve both the driver's steering lightness at low speed and the driver's steering wheel road feeling at high speed

Images