Device for regulating heating capacity of a heat exchanger

US4548355A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Albert Stolz
• Wolfgang Volz · Magstadt, DE
• Gunther Sigmund · Sindelfingen, DE

Key dates

• Filing date: Jul 28, 1980
• Grant date: Oct 22, 1985
• Expiry date: Jul 28, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D23/24
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A device for regulating the heat output or heat capacity of a heat exchanger in an automotive vehicle with an actuating member to control the flow of a heat exchange medium and with a control device operating the actuating member. To provide input to the control device, signals are received from a highly rated internal temperature sensor and a lower rated heating air temperature sensor disposed at the outlet of the heat exchanger as well as a manually adjustable set point generator. The control device includes a pulse generator producing a triangular voltage of a constant frequency, with a differential amplifier for the signals of the temperature sensors as well as the set point generator. A comparator is provided for producing rectangular pulses in correspondence with the triangular voltage frequency, with a pulse width corresponding to the temperature signal of the differential amplifier. The heat exchanger is tubular and has a large ratio of heat exchange medium volume to heat dissipating surface area. The actuating member is formed as a solenoid valve which is in an open position when the electromagnet of the valve is unenergized. The valve is arranged downstream of the heat ex…