Control method and system for electric vehicle and ptc electric heater used for electric vehicle

A technology for electric heaters and electric vehicles, applied in air heaters, fluid heaters, ohmic resistance heating components, etc., can solve problems such as inability to adjust target power, heat instability, etc., to achieve equal heat and accurate heating power control , the effect of reducing electromagnetic interference

Active Publication Date: 2018-09-11
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this characteristic causes the heat output by the PTC electric heater to be unstable
Under the conditions of different heat dissipation conditions and different ambient temperatures, the output heat of the same PTC material after being energized is not the same, so there will be problems that the comfortable target power (heating capacity) cannot be adjusted.

Method used

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  • Control method and system for electric vehicle and ptc electric heater used for electric vehicle
  • Control method and system for electric vehicle and ptc electric heater used for electric vehicle
  • Control method and system for electric vehicle and ptc electric heater used for electric vehicle

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Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] A control method for a PTC electric heater for an electric vehicle, a control system for a PTC electric heater for an electric vehicle, and an electric vehicle according to embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] image 3 It is a flowchart of a control method for a PTC electric heater for an electric vehicle according to an embodiment of the present invention. Among them, the heating power of the PTC electric heater is controlled by the power switc...

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PUM

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Abstract

A control method for a PTC electric heater of an electric vehicle, comprising the following steps: detecting working currents of a PTC electric heater; sampling the working currents to obtain current sampling values, and performing integral calculation on the current sampling value of each sampling period to obtain calculated power of the PTC electric heater; determining, within each switching period of a power switching transistor, whether the calculated power reaches target power of the PTC electric heater; if the calculated power reaches the target power of the PTC electric heater, controlling the PTC electric heater to stop heating by controlling the power switching transistor so that the heating amount of the PTC electric heater within each switching period keeps consistent with the heating amount corresponding to the target power. Also disclosed are a control system for a PTC electric heater of an electric vehicle, and an electric vehicle.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method for a PTC electric heater for an electric vehicle, a control system for a PTC electric heater for an electric vehicle and an electric vehicle. Background technique [0002] In the related art, common PTC electric heater products mostly adopt two control driving modes. One of them is switch control, the power switch tube or relay is kept closed or disconnected for a long time, and the power classification is realized by combining multiple power switch tubes or relays, such as figure 1 shown. However, in this control method, although the switching loss is small, the power level distribution is not fine enough, and the system cost is high. The other is PWM (Pulse Width Modulation, pulse width modulation) control, such as figure 2 As shown, the current is controlled by controlling the switching frequency of the power switching tube (such as IGBT) to adj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60H1/22H05B3/02
CPCB60H1/22F24H3/04H05B3/14
Inventor 李奇肖胜然周罕华马学骞
Owner BEIJING ELECTRIC VEHICLE
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