CN116255289A - Temperature controller for heating diesel oil in winter and control method - Google Patents

Abstract

The invention provides a temperature controller and a control method for heating diesel oil in winter. The controller includes an input signal and an output signal, the input signal includes the vehicle ON gear signal, etc., and the output signal includes the PTC heating rod control signal, etc. The method includes: if the controller receives a heating signal, if the fuel temperature is lower than the preset temperature threshold, control the PTC heating rod to start heating; use PWM control to turn on the three PTC heating rods in sequence; condition, the controller controls the oil supply pump/exhaust pump to work according to the preset logic; if the engine starting condition is met, the controller sends a signal to the driver that the ignition can be started; if the coolant temperature is higher than the preset temperature threshold, the controller stops heating. The invention can make the engine using No. 0 diesel oil start directly after being heated at an ambient temperature of -30°C in cold winter, and improves the economy of the whole vehicle while meeting the engine starting requirements.

Description

A temperature controller and control method for diesel heating in winter

technical field

Embodiments of the present invention relate to the technical field of diesel commercial vehicle control, and in particular to a temperature controller and control method for heating diesel in winter.

Background technique

In winter in the cold regions of our country, after the commercial vehicle engine stops running for a long time, the No. 0 diesel oil in the fuel tank will hang wax and solidify due to the low temperature, making it difficult for the engine to suck oil from the fuel tank and start. At present, commercial vehicles are equipped with -35 diesel oil tanks to avoid the problem that the 0 diesel oil is waxy and difficult to start. When the engine is just started, the No.-35 diesel oil is sucked first. When the engine is running for a period of time, the No. 0 diesel oil in the fuel tank is heated by the waste heat of the engine, and then the No. 0 diesel oil in the fuel tank can be extracted for work. This kind of technical means is not only loaded down with trivial details but also increases vehicle gross weight and reduces vehicle economy and consumes time. Therefore, to develop a temperature controller and control method for heating diesel oil in winter, which can effectively overcome the defects in the above-mentioned related technologies, has become an urgent problem to be solved in the industry.

Contents of the invention

In view of the above-mentioned problems in the prior art, an embodiment of the present invention provides a temperature controller and a control method for heating diesel oil in winter.

In the first aspect, the embodiment of the present invention provides a temperature control method for diesel heating in winter, including: if the controller receives a heating signal, if the fuel temperature is lower than the preset temperature threshold, control the PTC heating rod to start heating; Use PWM control to turn on the 3-way PTC heating rods in turn. If the PWM control duration is greater than the preset PWM control duration threshold, the heating rods will be controlled to heat with a 100% duty cycle; if the working conditions of the fuel supply pump are met, the controller will control the fuel supply pump according to the preset Logical work; if the working condition of the exhaust pump is met, the controller controls the exhaust pump to work according to the preset logic; if the engine starting condition is met, the controller sends a signal to the driver that the ignition can be started; if the coolant temperature is higher than the preset temperature threshold , the controller stops heating;

On the basis of the content of the above-mentioned method embodiment, the temperature control method for winter diesel heating provided in the embodiment of the present invention, if the controller receives a heating signal, if the fuel temperature is lower than the preset temperature threshold, then control the PTC The heating rod starts heating, including: the heating signal comes from the vehicle heating button switch signal, and the fuel temperature signal comes from the analog-to-digital conversion module of the controller, and the analog-to-digital conversion module converts the analog value of the external temperature sensor into a digital value , and then processed by the controller to obtain the fuel temperature value, the 3-way PTC heating rod external to the controller is the main heating device, and the controller controls the switch of the heating rod.

On the basis of the content of the above-mentioned method embodiment, the temperature control method for winter diesel heating provided in the embodiment of the present invention, the use of PWM control to turn on three PTC heating rods in turn, includes: the use of PWM control refers to the use of Change the control mode of the heating rod power supply voltage duty cycle from small to large and then to full duty cycle. The main goal is to control the stability of the heating current. The sequential opening of 3 PTC heating rods refers to turning on a heating rod at regular intervals .

On the basis of the content of the above-mentioned method embodiments, the temperature control method for heating diesel oil in winter provided in the embodiments of the present invention, if the working conditions of the fuel supply pump are met, the controller controls the fuel supply pump to work according to the preset logic, including: The working condition of the fuel supply pump refers to turning on the fuel supply pump before the end of warm-up, that is, before the engine is started. The preset logic of the fuel supply pump refers to determining the exact opening time and working time of the fuel supply pump according to the difference in ambient temperature and oil temperature.

On the basis of the content of the above-mentioned method embodiments, the temperature control method for heating diesel oil in winter provided in the embodiments of the present invention, if the working conditions of the exhaust pump are reached, the controller controls the exhaust pump to work according to the preset logic, including: The working condition of the exhaust pump refers to controlling the exhaust pump to start working after the engine is successfully started and continues to work for a certain period of time. The preset logic of the exhaust pump means that the exhaust pump works in a reciprocating cycle after working for a period of time and stopping for a period of time.

On the basis of the content of the above-mentioned method embodiments, the temperature control method for heating diesel oil in winter provided in the embodiments of the present invention, if the engine starting condition is met, the controller sends a signal to the driver that the ignition can be started, including: The starting condition of the engine refers to reaching the starting condition when the preheating time corresponding to the fuel temperature is reached, and the corresponding preheating time is obtained through experiments. .

In the second aspect, the embodiment of the present invention provides a temperature controller for diesel heating in winter, including: an information collection module, used for the controller to collect and input various signals, specifically including the vehicle ON gear signal, the vehicle ACC Gear signal, vehicle CAN signal, heating switch signal, fuel temperature signal; control output module, used for controller output signal to control various external devices, specifically PTC heating rod control signal, fuel supply pump control signal, exhaust pump control signal, LED signal light control signal, CAN signal, etc.; fault diagnosis module, used for various fault diagnosis and troubleshooting of the controller, specifically checking the working status of external equipment such as heating rods, oil supply pumps, exhaust pumps, LED signal lights, and temperature sensors. If the work is abnormal, the fault code is sent through CAN communication and the fault light is turned on.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the flow chart of the temperature control method for winter diesel heating provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of input and output of a temperature controller for heating diesel oil in winter provided by an embodiment of the present invention;

Fig. 3 is the structural schematic diagram of the temperature controller that is used for heating diesel oil in winter provided by the embodiment of the present invention;

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. In addition, the technical features in each embodiment or a single embodiment provided by the present invention can be combined arbitrarily with each other to form a feasible technical solution. This combination is not restricted by the sequence of steps and/or structural composition mode, but it must be Based on the ability of those skilled in the art to realize, when the combination of technical solutions is contradictory or unrealizable, it should be considered that such combination of technical solutions does not exist and is not within the protection scope of the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

In the first aspect, the embodiment of the present invention provides a temperature control method for diesel heating in winter, as shown in Figure 1, if the controller receives a heating signal, if the fuel temperature is lower than the preset temperature threshold, the PTC will be controlled to heat The rod starts to heat up; use PWM control to turn on the 3 PTC heating rods in turn, if the PWM control duration is longer than the preset PWM control duration threshold, the heating rod will be controlled with a 100% duty cycle; if the working conditions of the oil supply pump are met, the controller will control the supply The oil pump works according to the preset logic; if the working condition of the exhaust pump is reached, the controller controls the exhaust pump to work according to the preset logic; if the engine starting condition is met, the controller sends a signal to the driver that the ignition can be started; preset temperature threshold, the controller stops heating;

On the basis of the content of the above method embodiment, as shown in Figure 1, the temperature control method for winter diesel heating provided in the embodiment of the present invention, if the controller receives a heating signal, if the fuel temperature is lower than the preset temperature threshold, then control the PTC heating rod to start heating, including: the heating signal comes from the vehicle heating button switch signal, the fuel temperature signal comes from the analog-to-digital conversion module of the controller, and the analog-to-digital conversion module converts the temperature of the external temperature sensor The analog quantity is converted into a digital quantity, and then processed by the controller to obtain the fuel temperature value. The 3-way PTC heating rod connected to the controller is the main heating device, and the controller controls the switch of the heating rod.

On the basis of the content of the above-mentioned method embodiment, as shown in Figure 1, the temperature control method for winter diesel heating provided in the embodiment of the present invention, the use of PWM control to open 3 PTC heating rods in sequence, including: The use of PWM control refers to the control method of changing the duty cycle of the heating rod power supply voltage from small to large and then to full duty cycle. The main goal is to control the stability of the heating current. Turn on a heating rod for a certain amount of time.

On the basis of the content of the above-mentioned method embodiment, as shown in Figure 1, the temperature control method for heating diesel oil in winter provided in the embodiment of the present invention, if the working conditions of the fuel supply pump are reached, the controller controls the fuel supply pump according to the preset Logic work, including: the working condition of the fuel supply pump refers to turning on the fuel supply pump before the end of warm-up, that is, before the engine starts, and the preset logic of the fuel supply pump refers to determining the exact opening of the fuel supply pump according to the difference in ambient temperature and oil temperature time and working hours.

On the basis of the content of the above method embodiment, as shown in Figure 1, the temperature control method for heating diesel oil in winter provided in the embodiment of the present invention, if the exhaust pump working condition is reached, the controller controls the exhaust pump to follow the preset Logical work, including: the working condition of the exhaust pump refers to controlling the exhaust pump to start working after the engine is successfully started and continues to work for a certain period of time. way to work.

On the basis of the content of the above-mentioned method embodiment, as shown in Figure 1, in the temperature control method for winter diesel heating provided in the embodiment of the present invention, if the engine starting condition is met, the controller sends a signal that the ignition can be activated to the driver The starting signal includes: the engine starting condition means that the starting condition is reached when the preheating time corresponding to the fuel temperature is reached, and the corresponding preheating time is obtained through experiments. The heat indicator light turns on and off.

In the second aspect, the embodiment of the present invention provides a temperature controller for diesel heating in winter, as shown in Figure 2-Figure 3, the information collection module is used for the controller to collect and input various signals, specifically the whole vehicle ON gear signal, vehicle ACC gear signal, vehicle CAN signal, heating switch signal, fuel temperature signal; control output module, used for controller output signal to control various external devices, specifically PTC heating rod control signal, oil supply pump control Signal, exhaust pump control signal, LED signal light control signal, CAN signal, etc.; fault diagnosis module, used for various fault diagnosis and troubleshooting of the controller, specifically including heating rod, oil supply pump, exhaust pump, LED signal light, temperature sensor and other external Check the working condition of the equipment, if the work is abnormal, send the fault code through CAN communication and light up the fault light.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (7)

1. A temperature controller control method for winter diesel heating, comprising: if the controller receives the heating signal, if the temperature of the fuel is lower than a preset temperature threshold value, the PTC heating rod is controlled to start heating; sequentially opening 3 paths of PTC heating rods by PWM control, and controlling the heating rods to heat by one hundred percent duty ratio if the PWM control time length is longer than a preset PWM control time length threshold; if the working condition of the oil supply pump is met, the controller controls the oil supply pump to work according to preset logic; if the working condition of the exhaust pump is met, the controller controls the exhaust pump to work according to preset logic; if the engine starting condition is met, the controller sends a signal capable of igniting and starting to a driver; and if the temperature of the cooling liquid is higher than the preset temperature threshold value, the controller stops heating.

2. A control method of a temperature controller for winter diesel heating as claimed in claim 1, wherein if the controller receives the heating signal, if the fuel temperature is lower than a preset temperature threshold, the control of the PTC rod to start heating includes: the heating signal is from a whole car heating key switch signal, the fuel temperature signal is from a controller analog-to-digital conversion module, the analog-to-digital conversion module converts the analog quantity of an external temperature sensor into a digital quantity, then the digital quantity is processed by the controller to obtain a fuel temperature value, and the 3 paths of PTC heating rods externally connected with the controller are main heating devices, and the controller controls the switching of the heating rods.

3. A control method of a temperature controller for winter diesel heating as claimed in claim 1, wherein the sequentially turning on the 3 PTC heating rods using PWM control comprises: the PWM control is a control mode of changing the duty ratio of the power supply voltage of the heating rod from small to large to full duty ratio, the main aim is to control the stability of heating current, and the sequential opening of 3 paths of PTC heating rods is to open one heating rod at certain intervals.

4. The method of claim 1, wherein the controller controls the fuel feed pump to operate according to a preset logic if the fuel feed pump operating condition is reached, comprising: the working condition of the oil supply pump refers to that the oil supply pump is opened before the end of preheating, namely before the engine is started, and the preset logic of the oil supply pump refers to that the exact opening time and the working time of the oil supply pump are determined according to the difference of the ambient temperature and the oil temperature.

5. A method of controlling a temperature controller for winter diesel heating as claimed in claim 1, wherein the controller controls the exhaust pump to operate according to a predetermined logic if the exhaust pump operating condition is reached, comprising: the working condition of the exhaust pump means that the engine is started successfully and is controlled to start working after the engine works continuously for a certain time, and the preset logic of the exhaust pump means that the exhaust pump works in a mode of stopping for a period of time and reciprocating the exhaust pump according to a period of working time.

6. A method of controlling a temperature controller for winter diesel heating as claimed in claim 1, wherein the controller sends a signal to the driver that a spark start is possible if an engine start condition is reached, comprising: the engine starting condition refers to the preheating time corresponding to the temperature of the fuel oil reaching the starting condition, the corresponding preheating time is obtained through experiments, and the signal of igniting and starting refers to the on-off of a preheating indicator lamp of a cab.

7. A temperature controller for winter diesel heating, comprising: the information acquisition module is used for acquiring and inputting various signals, specifically a whole vehicle ON gear signal, a whole vehicle ACC gear signal, a whole vehicle CAN signal, a heating switch signal and a fuel temperature signal, by the controller; the control output module is used for outputting signals by the controller to control various external devices, and specifically comprises PTC heating rod control signals, oil supply pump control signals, exhaust pump control signals, LED signal lamp control signals, CAN signals and the like; the fault diagnosis module is used for diagnosing and checking various faults of the controller, and particularly comprises working condition checking of external equipment such as a heating rod, an oil supply pump, an exhaust pump, an LED signal lamp, a temperature sensor and the like, and sending a fault code and lighting the fault lamp through CAN communication if the working is abnormal.

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