AU2014101538A4

AU2014101538A4 - Electric-controlled idle-running in-gear flameout system of an engine and control method thereof

Info

Publication number: AU2014101538A4
Application number: AU2014101538A
Authority: AU
Inventors: Liqiang AN; Junhong Chen; Jianju SHEN; Liyong SU; Yi Xiong; Wen Zhang
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2013-08-30
Filing date: 2014-08-01
Publication date: 2015-02-12
Anticipated expiration: 2022-08-01
Also published as: JP6096387B2; WO2015027791A1; CN103485903A; DE112014003468B4; CN103485903B; DE112014003468T5; JP2016529433A

Abstract

The present invention provides an idle-running in-gear flameout system of an electric-controlled engine and control method thereof. The idle-running in-gear flameout system comprises an engine controller; a temperature sensor having an input end connected 5 with an input end of the engine controller via a first temperature signal bundle and a second temperature signal input bundle, to form an engine thermal protection system; and an idle in-gear flameout control system, which comprises a first temperature control resistor, a second temperature control resistor, a selector switch and a relay. The electric-controlled idle-running in-gear flameout system according to the present invention is designed with 10 oil-injection restriction technique when the engine is forced to idle. By means of thermal protection oil-restriction of the electric-controlled system, an oil amount restriction is conducted for thermal protection according to oil-injection characteristics of the engine when a vehicle starts to move. Meanwhile, the vehicle air-conditioner device is configured in different ways to make sure that the engine does not generate any power for staring vehicle, 15 thereby achieving the goal of flameout of the engine during in-gear by mistake. The system has high precision and sensitivity and low control cost and can prevent the occurrence of dangerous accidents. Fig. 1 minimum oil oil amount line for amount vehicle starting thermal protection Normal Dil amount threshold idle-running oil line amount line -nithe vehicle starts by mistake so that the oil amount is restricted to cause Fig. 2

Description

- 1 ELECTRIC-CONTROLLED IDLE-RUNNING IN-GEAR FLAMEOUT SYSTEM OF AN ENGINE AND CONTROL METHOD THEREOF TECHNICAL FIELD 5 The invention relates to the engine field, and in particular, to an electric-controlled idle-running in-gear flameout system of an engine and control method thereof. BACKGROUND OF THE RELATED ART When the forced idle function is used, the conventional vehicle electric-controlled engine 10 does not have an error-proofing function for the vehicle operation, i.e., the electric-controlled engine can only make sure that the engine is in an idle state but cannot restrict the whole vehicle running state, so that when the driver makes forward shift by mistake, the vehicle will start moving forward. For instance, before all the passengers get on a bus, the driver shifts to start, and the vehicle will start moving forward and thus lead to dangerous accidents. 15 The conventional tool for restricting a vehicle from starting, e.g., a GPS positioning system for the feedback of traffic controls or a vehicle speed sensor for the feedback of vehicle speed signal restrictions, has low precision and cannot instantly perform a feedback process to the starting of a vehicle. Moreover, the conventional tool for restricting a vehicle from starting has a relatively high cost. 20 SUMMARY OF THE INVENTION In order to overcome the abovementioned shortages of the prior art, the invention provides an electric-controlled idle-running in-gear flameout system of an engine and control method thereof. The system has a simple and reasonable structure, high precision and sensitivity, and 25 low cost. The system can stop the engine when the engine is in an idle state and is engaged in gears by mistake, and avoid the vehicle from starting to move forward and causing dangerous accidents. To this end, according to an aspect of the invention, an electric-controlled idle-running in-gear flameout system of an engine is provided, which comprises an engine controller; a -2 temperature sensor having an input end connected with an input end of the engine controller via a first temperature signal bundle and a second temperature signal input bundle to form an engine thermal protection system; and an idle in-gear flameout control system. The idle in-gear flameout control system comprises a first temperature control resistor, a second 5 temperature control resistor, a selector switch and a relay. The selector switch is a relay-form switch. A vehicle forced idle signal port is connected with both a control input end of the relay and the engine controller; a stationary contact of the relay is connected to the second temperature signal input bundle; a movable contact of the relay is connected to a stationary contact of the selector switch; a movable contact of the selector switch is connected 10 with one end of the first temperature control resistor and one end of second temperature control resistor; the other ends of the first and second temperature control resistor are both connected with the first temperature signal input bundle; and in response to a signal from the vehicle forced idle signal port, the first temperature control resistor is selectively connected to the temperature sensor in parallel by the selector switch and the relay. 15 According to a preferred embodiment of the present invention, the temperature sensor is a water temperature sensor, a fuel oil temperature sensor, an air inflow temperature sensor or an engine oil temperature sensor. According to a preferred embodiment of the present invention, the vehicle forced idle signal is 24 V+. 20 According to a preferred embodiment of the present invention, a vehicle air conditioning signal port is connected to a control terminal contact of the selector switch. According to a preferred embodiment of the present invention, the vehicle air conditioning signal port is 24 V+. According to another aspect of the invention, a control method using the abovementioned 25 electric-controlled idle-running in-gear flameout system of an engine is provided, with the method comprising: controlling an engine to keep in a forced idle state by an engine controller in response to a vehicle forced idle signal from a vehicle idle signal port; after the relay is closed in response to the vehicle forced idle signal from the whole forced idle signal port, a selector switch is connected, so that a first temperature control resistor and a 30 temperature sensor are connected in parallel; and starting thermal protection oil-restricting by the engine controller.

- 3 According to a preferred embodiment of the present invention, the method further comprises: a step of selectively connecting the selector switch to a second temperature control resistor while disconnecting the first temperature control resistor when a control terminal contact of the selector switch receives a control signal from a vehicle air-conditioner signal port, so that 5 the second temperature and the temperature sensor are connected in parallel. As compared with the prior art, the present invention has the following beneficial effects that: The electric-controlled idle-running in-gear flameout system of an engine of the invention is designed with oil-injection restriction technique when the engine is forced to idle. By means of thermal protection oil-restriction of the electric-controlled system, an oil amount restriction 10 is conducted for thermal protection according to oil-injection characteristics of the engine when a vehicle starts to move. Meanwhile, the vehicle air-conditioner device is configured in different ways to make sure that the engine does not generate any power for staring vehicle, thereby achieving the goal of flameout of the engine during in-gear by mistake. The system has high precision and sensitivity and low control cost and can prevent the occurrence of 15 dangerous accidents. The present invention will be further described below in detail with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS 20 The accompanying drawings are provided for further understanding of the invention and constitute a part of the specification and serve to explain the invention together with the embodiments of the invention without any restriction to the invention, in which: Fig. 1 is a schematic diagram of an idle-running in-gear flameout system of an electric-controlled engine of the present invention; 25 Fig. 2 is an oil amount diagram of the idle-running in-gear flameout system of an electric-controlled engine of the present invention; Fig. 3 is a flow diagram of the idle-running in-gear flameout system of an electric-controlled engine of the present invention; The following reference numerals are marked with reference to the drawings: 30 1- temperature sensor; -4 11- first temperature signal input bundle; 12- second temperature signal input bundle; 2- engine controller; 3- idle in-gear flameout control system; 5 4- first temperature control resistor; 5- second temperature control resistor; 6- selector switch; 7- relay; 8- vehicle forced idle signal port; 10 9- vehicle air conditioning signal port. DETAILED DESCRIPTION OF THE PRESENT INVENTION The preferred embodiments of the invention are illustrated below in conjunction with the accompanying drawings. It is to be understood that the preferred embodiments described 15 herein are only for illustrating and explaining the invention and do not serve to limit it. The electric-controlled idle-running in-gear flameout system of an engine of the invention is designed with oil-injection restriction technique when the engine is forced to idle. By means of thermal protection oil-restriction of the electric-controlled system, an oil amount restriction is conducted for thermal protection according to oil-injection characteristics of the engine 20 when a vehicle starts to move. Meanwhile, the vehicle air-conditioner device is configured in different ways to make sure that the engine does not generate any power for staring vehicle, thereby achieving the goal of flameout of the engine during in-gear by mistake. The system has high precision and sensitivity and low control cost and can prevent the occurrence of dangerous accidents. 25 As shown in Fig. 1, the idle-running in-gear flameout system of an engine according to a preferred embodiment of the present invention restricts the oil amount of the engine by means of the electric-controlled system thermal protection technique to achieve the objective that the vehicle runs normally in an idle state but it immediately stops after in-gear (the gear is -5 engaged) by mistake. The idle-running in-gear flameout system comprises a thermal protection system consisting of a temperature sensor 1 and an engine controller (ECU) 2, and an idle-in-gear flameout control system 3 attached to the thermal protection system. If the idle-in-gear flameout control system 3 receives a vehicle forced idle signal, the temperature 5 control resistor is connected to the temperature sensor 1 in parallel to change the temperature collecting signal value of the engine controller 2, and the engine oil amount is restricted by means of the electric-controlled thermal protection policy to achieve the aim that the vehicle runs normally in an idle state but it immediately stops after in-gear by mistake. According to the resistance characteristic of the temperature sensor, the aim of artificially 10 changing the current temperature signal value is achieved by connecting in parallel the temperature signal pin of the temperature sensor 1 to a resistor having a corresponding resistance. For example, normal water temperature of 89 'C, but after connecting a resistor in parallel, the temperature signal actually collected by the engine controller 2 may reach 125 'C, and the engine immediately restricts 70 % of the oil, and only 30% is available. In a similar 15 way, when the parallel resistor enables the temperature signal actually collected by the engine controller 2 to reach 140 'C, the aim of restricting 85 % of the oil with 15 % left is achieved. The temperature sensor 1 is a water temperature sensor, a fuel oil temperature sensor, an air inflow temperature sensor or an engine oil temperature sensor, and the input end thereof is connected with the input ends of the engine controller 2 via the first and second temperature 20 signal input bundles 11, 12 to form an engine thermal protection system. The idle-running in-gear flameout control system 3 comprises: a first temperature control resistor 4, a second temperature control resistor 5, a selector switch 6 (which is a relay form) and a relay 7. The control input end of the relay 7 is connected with the vehicle forced idle signal port 8 for receiving a vehicle forced idle signal (24 V+). At the same time, the vehicle 25 forced idle signal port 8 is connected with the engine controller 2. A stationary contact of the relay 7 is connected to the second temperature signal input bundle 12. A movable contact of the relay 7 is connected to a stationary contact of the selector switch 6. A movable contact of the selector switch 6 is connected to respective ends of the first and second temperature control resistors 4, 5. The other ends of the first and second temperature control resistors 4, 5 30 are respectively connected with the first temperature signal input bundle 11. Additionally, the vehicle air-conditioner signal port 9 (24 V+) is connected to a control terminal contact of the selector switch 6.

-6 As shown in Fig. 3, the whole control process for idle-in-gear flameout is as follows. When the control input end of the relay 7 of the idle-in-gear flameout control system 3 does not receive a vehicle forced idle signal (24 V+) from the vehicle forced idle signal port 8, the relay 7 does not respond, i.e., the sensor 1 is not affected and directly inputs to the engine 5 controller 2 with an original signal, and the engine works normally. As shown in Fig. 2, when the control input end of the relay 7 of the idle-in-gear flameout control system 3 receives the vehicle forced idle signal (24 V+) from the vehicle forced idle signal port 8, the engine controller 2 controls the engine to be maintained in a forced idle state, and at this time the relay 7 is closed after receiving the control signal. The selector switch 6 is 10 connected so as to connect the first temperature control resistor 4. The current temperature signal value transmitted to the engine controller 2 by the temperature sensor is changed. The engine controller 2 starts the thermal protection to restrict oil. The thermal protection oil amount is lower than the minimum oil amount for vehicle starting. When the vehicle starts by mistake in the engine thermal protection oil-restriction condition, the vehicle will stall due to 15 the restricted oil amount, thus the vehicle runs normally in an idle state but it immediately stalls after in-gear by mistake. The resistance of the first or second temperature control resistor 4, 5 needs to be flexibly selected according to the temperature characteristic-resistance profile of the temperature sensor 1 so as to make sure that the connected resistor reaches the engine thermal protection 20 temperature zone, and the resistor thermal protection temperature zones do not overlap, so that the oil amount restriction value is flexibly and accurately set according to the specific requirements of the vehicle engine. The oil restriction value is shown in the following table: Temp. -40 0 98 99 100 101 102 103 104 105 110 130 133 134 140 150

(

0 C) Oilres. 0 0 0 2 5 11 20 38.4 60 70 70 70 70 85 85 85 (%) 25 The restricted oil amount can guarantee the normal idle-running of the engine but cannot meet -7 the need of the vehicle starting oil amount and thus realize the in-gear flameout function of a module. The air-conditioner control process is as follows. When the control terminal contact of the selector switch 6 does not receive the control signal 5 from the vehicle air-conditioner signal port 9, i.e., the air-conditioner is not switched on when the vehicle is forced to idle, the selector switch 6 is connected with the first temperature control resistor 4 in an original state so that the first temperature control resistor 4 is connected with the temperature sensor 1 in parallel. A new temperature characteristic signal is formed and inputted into the engine controller 2 (the temperature characteristic is adjusted to 10 guarantee that it is in the engine thermal protection temperature zone in the engine controller 2). By means of the software thermal protection function policy of the engine controller 2, when the engine is forced to idle, the oil amount restriction is achieved. When the control terminal contact of the selector switch 6 receives the control signal from the vehicle air-conditioner signal port 9, i.e., the air-conditioner is switched on when the vehicle 15 is forced to idle (considering the power influence of accessory like air-conditioner), the selector switch 6 is selectively connected with the second temperature control resistor 5 (at this time the first temperature control resistor 4 is disconnected) so that the second temperature control resistor 5 is connected with the temperature sensor 1 in parallel. A new temperature characteristic signal is formed and input to the engine control 2 (the temperature 20 characteristic is adjusted to guarantee that it is in the engine thermal protection temperature zone in the engine controller 2, while not overlapping with the temperature zone when the first temperature control resistor 4 is connected in parallel). In a similar way, by means of the software thermal protection function policy of the engine controller 2, the oil amount restriction when the engine is forced to idle is achieved, thereby achieving the in-gear 25 flameout function of the module. The electric-controlled idle-running in-gear flameout system of an engine of the invention is designed with oil-injection restriction technique when the engine is forced to idle. By means of thermal protection oil-restriction of the electric-controlled system, an oil amount restriction is conducted for thermal protection according to oil-injection characteristics of the engine 30 when a vehicle starts to move. Meanwhile, the vehicle air-conditioner device is configured in different ways to make sure that the engine does not generate any power for staring vehicle, thereby achieving the goal of flameout of the engine during in-gear by mistake. The system - 8 has high precision and sensitivity and low control cost and can prevent the occurrence of dangerous accidents. The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be 5 exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents. 10

Claims

1. An electric-controlled idle-running in-gear flameout system of an engine, which comprises: an engine controller; a temperature sensor having an input end connected with an input end of the engine controller 5 via a first temperature signal bundle and a second temperature signal input bundle, to form an engine thermal protection system; and an idle in-gear flameout control system, which comprises a first temperature control resistor, a second temperature control resistor, a selector switch and a relay, wherein the selector switch is a relay-form switch, a vehicle forced idle signal port being 10 connected with both a control input end of the relay and the engine controller, a stationary contact of the relay being connected to the second temperature signal input bundle, a movable contact of the relay being connected to a stationary contact of the selector switch; a movable contact of the selector switch being connected with one end of the first temperature control resistor and one end of second temperature control resistor, the other ends of the first and 15 second temperature control resistor being both connected with the first temperature signal input bundle; and wherein in response to a signal from the vehicle forced idle signal port, the first temperature control resistor is selectively connected to the temperature sensor in parallel by the selector switch and the relay. 20

2. The electric-controlled idle-running in-gear flameout system as claimed in claim 1, wherein the temperature sensor is a water temperature sensor, a fuel oil temperature sensor, an air inflow temperature sensor or an engine oil temperature sensor.

3. The electric-controlled idle-running in-gear flameout system as claimed in claim 1, wherein 25 the vehicle forced idle signal is 24 V+.

4. The electric-controlled idle-running in-gear flameout system as claimed in anyone of - 10 claims 1-3, wherein a vehicle air conditioning signal port is connected to a control terminal contact of the selector switch, and in response to a signal from the vehicle air conditioning signal port, the second temperature control resistor is selectively connected with the temperature sensor in parallel by the selector switch and by the relay. 5

5. The electric-controlled idle-running in-gear flameout system as claimed in claim 4, wherein the vehicle air conditioning signal port is 24 V+.

6. A control method using the electric-controlled idle-running in-gear flameout system as 10 claimed in anyone of claims 1-5 , the method comprising: controlling an engine to keep in a forced idle state by an engine controller in response to a vehicle forced idle signal from a vehicle idle signal port; after the relay is closed in response to the vehicle forced idle signal from the whole forced idle signal port, a selector switch is connected, so that a first temperature control resistor and a 15 temperature sensor are connected in parallel; and starting thermal protection oil-restricting by the engine controller.

7. The control method as claimed in claim 6, further comprising: selectively connecting the selector switch to a second temperature control resistor while 20 disconnecting the first temperature control resistor when a control terminal contact of the selector switch receives a control signal from a vehicle air-conditioner signal port, so that the second temperature and the temperature sensor are connected in parallel.