Diesel engine constant rotation speed analog signal output device

Abstract

The invention provides a diesel engine constant rotation speed analog signal output device. Comprising a central processing circuit, four Hall rotating speed analog signal generating circuits, four magnetoelectric rotating speed analog signal generating circuits, a control unit model selection switch group, a rotating speed signal type selection switch group, a power supply circuit, a power supply socket, a rotating speed signal output socket and an output device PCB. The device has the advantages that universality and expansibility are high, simulation and setting are carried out through rotating speed signal control output software, and a set rotating speed simulation signal is output according to the model of the control unit; meanwhile, four paths of independent rotating speed analog signals are output; the device is wide in application range, and meets the requirements of all diesel engine control unit fixed-speed analog signals at present.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine testing, and in particular relates to a constant speed analog signal output device for a diesel engine. Background Art

[0002] With the widespread application of different types of electronic control technologies (such as high-pressure common rail technology, single-unit pump electronic control technology, etc.) in diesel engines, more and more problems are exposed in the test process of diesel engine control units, as follows: different types of control units require different speed analog signals, some require Hall-type square waveform speed sensor signals, and some require magnetoelectric sinusoidal waveform speed sensor signals; different diesel engines have different mechanical structures such as crankshaft gears, cam gears, and number of cylinders, resulting in great differences in the phase and number of teeth of their crankshaft speed signals and cam speed signals, resulting in different phases of speed analog signals required by different diesel engine control units; currently on the market, the output device of the speed analog signal has a single function and can only output the crankshaft speed missing tooth signal or the cam speed multi-tooth signal separately, and cannot simultaneously output the crankshaft speed analog signal and the cam speed analog signal with the required phase relationship. Summary of the Invention

[0003] In view of this, the present invention aims to propose a diesel engine constant speed analog signal output device to solve the following problems in the prior art: different types of control units require different types of speed analog signals; different diesel engine control units require speed analog signals with different phases; and it is impossible to simultaneously output a crankshaft speed analog signal and a cam speed analog signal with the required phase relationship.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: A diesel engine constant speed analog signal output device, comprising a central processing circuit, a 4-channel Hall-type speed analog signal generating circuit, a 4-channel magnetoelectric speed analog signal generating circuit, a control unit model selection switch group, a speed signal type selection switch group, a power supply circuit, a power socket, a speed signal output socket and an output device PCB board; The control unit model selection switch group is connected to the central processing circuit, the central processing circuit is connected to the speed signal type selection switch group, the speed signal type selection switch group is respectively connected to the 4-way Hall-type speed analog signal generating circuit, the 4-way magnetoelectric speed analog signal generating circuit and the speed signal output socket, and the power supply circuit is connected to the power socket; The power supply circuit is respectively connected to the central processing circuit, the 4-way Hall-type speed analog signal generating circuit, the 4-way magnetoelectric speed analog signal generating circuit, the control unit model selection switch group and the speed signal type selection switch group; The central processing circuit, 4-channel Hall-type speed analog signal generating circuits, 4-channel magnetoelectric speed analog signal generating circuits, control unit model selection switch group, speed signal type selection switch group, power supply circuit, power socket and speed signal output socket are all installed and arranged on the output device PCB board.

[0005] Furthermore, the central processing circuit is an MCU minimum application system, including an MCU, a clock circuit, a reset circuit, an MCU power circuit and an LED indicator light circuit. The MCU is connected to the clock circuit, the reset circuit, the MCU power circuit and the LED indicator light circuit respectively. The MCU includes 4 PWM output pins, 4 optocoupler on / off control pins and 4 switch status detection pins.

[0006] Furthermore, the control unit model selection switch group includes four two-speed three-pin toggle switches, the middle pin of the two-speed three-pin toggle switch is connected to the switch status detection pin of the MCU, and the other two end pins of the two-speed three-pin toggle switch are respectively connected to the power supply +5V and ground.

[0007] Furthermore, the Hall-type speed analog signal generating circuit includes an operational amplifier U11A, a capacitor C41, a capacitor C42, a resistor R117, a resistor R118, a resistor R123, a resistor R125 and a button S4. The non-inverting input terminal of the operational amplifier U11A is connected to one end of the resistor R118 and one end of the capacitor C42 respectively, the other end of the resistor R118 is connected to the speed signal type selection switch group, the other end of the capacitor C42 is grounded, and the inverting input terminal of the operational amplifier U11A is connected to one end of the resistor R123 and one end of the capacitor C42 respectively. One end of the resistor R125 is connected, the other end of the resistor R123 is connected to the +5V power supply, the other end of the resistor R125 is grounded, the positive power input end of the operational amplifier U11A is connected to the +5V power supply, and the positive power input end of the operational amplifier U11A is grounded through the capacitor C41, the negative power input end of the operational amplifier U11A is grounded, and the output end of the operational amplifier U11A is respectively connected to one end of the resistor R117 and the speed signal type selection switch group, and the other end of the resistor R117 is connected to the power supply +5V through the button S4.

[0008] Furthermore, the magnetoelectric speed analog signal generating circuit includes an op amp U9A, an op amp U9B, a resistor R103, a resistor R104, a resistor R115, a resistor R116, a resistor R121, a capacitor C39, a capacitor C40, a capacitor C43, a capacitor C45 and an optocoupler U10, wherein the non-inverting input terminal of the op amp U9A is respectively connected to one end of the resistor R103 and one end of the resistor R104, the other end of the resistor R103 is grounded, and the other end of the resistor R104 is connected to a +12V power supply, the inverting input terminal of the op amp U9A is respectively connected to one end of the resistor R116 and one end of the capacitor C43, the other end of the resistor R116 is respectively connected to one end of the resistor R115 and the output pin 4 of the optocoupler U10, the other end of the capacitor C43 is grounded, and the resistor R1 15 The other end is connected to the power supply +12V, the output pin 3 of the optocoupler U10 is grounded, the input pin 1 of the optocoupler U10 is connected to the power supply +5V, the input pin 1 of the optocoupler U10 is grounded through the capacitor C40, the input pin 2 of the optocoupler U10 is connected to the speed signal type selection switch group through the resistor R121, the positive input terminal of the power supply of the operational amplifier U9A is connected to the power supply +12V, the positive input terminal of the power supply of the operational amplifier U9A is grounded through the capacitor C39, the negative input terminal of the power supply of the operational amplifier U9A is connected to the power supply -12V, the negative input terminal of the power supply of the operational amplifier U9A is grounded through the capacitor C45, the output terminal of the operational amplifier U9A is connected to the speed signal type selection switch group, the non-inverting input terminal of the operational amplifier U9B is grounded, and the inverting input terminal of the operational amplifier U9B is connected to its output terminal.

[0009] Furthermore, the speed signal type selection switch group includes a 4-way speed signal type selection switch circuit, and the speed signal type selection switch circuit includes an optocoupler U8, a relay K1, a two-speed three-pin switch K2, a resistor R105 and a capacitor C38. The input pin 1 of the optocoupler U8 is connected to the power supply +5V, and the input pin 1 of the optocoupler U8 is grounded through the capacitor C38. The input pin 2 of the optocoupler U8 is connected to the optocoupler on-off control pin of the MCU, the input pin 4 of the optocoupler U8 is connected to the power supply +5V, and the input pin 3 of the optocoupler U8 is grounded through the coil of the relay K1. The moving contact 8 of the relay K1 is connected to the PWM output pin of the MCU. The moving contact 3 of the electrical appliance K1 is connected to the speed signal output socket, the static contact 7 of the relay K1 is connected to the resistor R121 of the magnetoelectric speed analog signal generating circuit, the static contact 9 of the relay K1 is connected to the resistor R118 of the Hall type speed analog signal generating circuit, the static contact 4 of the relay K1 is connected to the output end of the operational amplifier U9A of the magnetoelectric speed analog signal generating circuit, the static contact 2 of the relay K1 is connected to the output end of the operational amplifier U11A of the Hall type speed analog signal generating circuit, the middle pin of the two-speed three-pin switch K2 is connected to the ground of the speed signal output socket, and the other two end pins of the two-speed three-pin switch K2 are respectively connected to the analog ground and the digital ground.

[0010] Furthermore, the power supply circuit includes an isolated power supply chip U5, an isolated power supply chip U6, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a resistor R42, a resistor R55, a resistor R69, a fuse F1, a diode D9 and a diode D10, the positive input end of the isolated power supply chip U5 is respectively connected to one end of the capacitor C19 and one end of the fuse F1, the negative input end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C19 and the ground, the positive output end VO+ of the isolated power supply chip U5 is respectively connected to one end of the capacitor C17, one end of the capacitor C18 and one end of the resistor R42, and the common end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C17, the other end of the capacitor C18, the other end of the resistor R42, one end of the capacitor C21, one end of the capacitor C22 and the ground. End and one end of the resistor R55, the negative output end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C21, the other end of the capacitor C22 and the other end of the resistor R55, the positive input end of the isolated power supply chip U6 is respectively connected to one end of the capacitor C31, one end of the capacitor C33, one end of the capacitor C34 and one end of the fuse F1, the negative input end of the isolated power supply chip U6 is connected to the other end of the capacitor C31, the other end of the capacitor C33, the other end of the capacitor C34 and the ground, the other end of the fuse F1 is respectively connected to the cathode of the diode D9 and the cathode of the diode D10, the anode of the diode D9 is connected to +24V, and the anode of the diode D10 is grounded, the positive output end of the isolated power supply chip U6 is connected to one end of the capacitor C32, one end of the capacitor C35 and one end of the resistor R69, and the negative output end of the isolated power supply chip U6 is connected to the other end of the capacitor C32, the other end of the capacitor C35 and the other end of the resistor R69.

[0011] Furthermore, the positive output end of the isolated power chip U5 is the power supply +12V, the negative output end of the isolated power chip U5 is the power supply -12V, the common end of the isolated power chip U5 is the analog ground, the positive output end of the isolated power chip U6 is the power supply +5V, and the negative output end of the isolated power chip U6 is the digital ground.

[0012] Furthermore, the power socket adopts a sealed curved needle seat-2EDGRC-5.08-2P terminal block, one end of which is connected to the power circuit and the other end is connected to the external power supply +24V.

[0013] Furthermore, the speed signal output socket adopts a double-row 8-core curved needle seat terminal, one end of which is connected to the diesel engine control unit and the other end is connected to the 4-way speed signal type selection switch circuit.

[0014] Compared with the prior art, the diesel engine constant speed analog signal output device described in the present invention has the following beneficial effects: (1) The output device of the diesel engine constant speed analog signal described in the present invention has strong versatility and extensibility. As long as the type and phase of the speed signal required by the control unit and the number of teeth and the number of missing teeth of the diesel engine speed signal gear are clearly defined, the speed signal control output software can be used to simulate and set the signal, thereby realizing the output of the crankshaft missing tooth speed analog signal, the cam multi-tooth speed analog signal, and the correct phase of the two. (2) The output device of the diesel engine speed analog signal of the present invention is easy to operate and can output the set speed analog signal by setting the switch group state according to the control unit model; (3) The output device of the diesel engine speed analog signal described in the present invention can output four speed analog signals separately and simultaneously; it has a wide range of applications and can meet the requirements of all current diesel engine control units for constant speed analog signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 A schematic diagram of the working principle of an embodiment of the present invention; Figure 2 A schematic diagram of a central processing circuit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a Hall-type speed simulation signal generating circuit according to an embodiment of the present invention; Figure 4 Schematic diagram of a magnetoelectric speed simulation signal generating circuit according to an embodiment of the present invention; Figure 5 Schematic diagram of output waveform according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a control unit model selection switch group according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a speed signal type selection switch group according to an embodiment of the present invention; Figure 8 A schematic diagram of a power supply circuit according to an embodiment of the present invention; Figure 9 This is a schematic diagram of a speed signal type selection switch circuit according to an embodiment of the present invention; Figure 10 It is a schematic diagram of the overall structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0020] like Figures 1 to 10 As shown, a diesel engine constant speed analog signal output device includes a central processing circuit, a 4-channel Hall-type speed analog signal generating circuit, a 4-channel magnetoelectric speed analog signal generating circuit, a control unit model selection switch group, a speed signal type selection switch group, a power supply circuit, a power socket, a speed signal output socket and an output device PCB board; The control unit model selection switch group is connected to the central processing circuit, the central processing circuit is connected to the speed signal type selection switch group, the speed signal type selection switch group is respectively connected to the 4-way Hall-type speed analog signal generating circuit, the 4-way magnetoelectric speed analog signal generating circuit and the speed signal output socket, and the power supply circuit is connected to the power socket; The power supply circuit is respectively connected to the central processing circuit, 4-way Hall-type speed analog signal generating circuits, 4-way magnetoelectric speed analog signal generating circuits, a control unit model selection switch group and a speed signal type selection switch group.

[0021] The specific implementation is as follows: In a preferred embodiment of the present invention, the central processing circuit is an MCU minimum application system, including an MCU, a clock circuit, a reset circuit, an MCU power circuit and an LED indicator circuit, the MCU is respectively connected to the clock circuit, the reset circuit, the MCU power circuit and the LED indicator circuit, the MCU includes 4 PWM output pins, 4 optocoupler on / off control pins and 4 switch status detection pins; the control unit model selection switch group includes 4 two-speed three-pin toggle switches, the middle pin of the two-speed three-pin toggle switch is connected to the switch status detection pin of the MCU, and the other two end pins of the two-speed three-pin toggle switch are respectively connected to the power supply +5V and the ground; the speed signal type selection switch group includes 4 speed signal type selection switch circuits, the speed signal type selection switch circuit includes an optocoupler U8, a relay K1, a two-speed three-pin switch K2, a resistor R105 and a capacitor C38, the input pin 1 of the optocoupler U8 is connected to the power supply +5V, and the optocoupler U8 The input pin 1 is grounded through the capacitor C38, the input pin 2 of the optocoupler U8 is connected to the optocoupler on-off control pin of the MCU, the input pin 4 of the optocoupler U8 is connected to the power supply +5V, the input pin 3 of the optocoupler U8 is grounded through the coil of the relay K1, the moving contact 8 of the relay K1 is connected to the PWM output pin of the MCU, the moving contact 3 of the relay K1 is connected to the speed signal output socket, the static contact 7 of the relay K1 is connected to the resistor R121 of the magnetoelectric speed analog signal generating circuit, the static contact 9 of the relay K1 is connected to the resistor R118 of the Hall-type speed analog signal generating circuit, the static contact 4 of the relay K1 is connected to the output end of the operational amplifier U9A of the magnetoelectric speed analog signal generating circuit, the static contact 2 of the relay K1 is connected to the output end of the operational amplifier U11A of the Hall-type speed analog signal generating circuit, the middle pin of the two-speed three-pin switch K2 is connected to the ground of the speed signal output socket, and the other two end pins of the two-speed three-pin switch K2 are respectively connected to the analog ground and the digital ground.In this embodiment, the central processing circuit is used to download, install, and run the speed signal control output software. The software control logic relies on the output comparison function of the ECT output comparison module of the MCU to calculate the duration of the high and low levels of the output square wave based on information such as the required output speed signal frequency, signal tooth profile tooth pitch, tooth width, and the number of missing teeth of special teeth. During the ECT timer interrupt, the I / O interface outputs the corresponding high and low levels, thereby outputting the required speed waveform. The ECT interrupt is responded to by the Xgate coprocessor of the MC9S12XEQ512, thereby reducing the burden on the CPU and ensuring the accuracy and stability of signal generation. The control unit model selection switch group sets the control unit model by the switch arrangement and switch state high and low levels. The speed signal type selection switch group sets the speed signal type by the switch arrangement, switch state, and relay on / off state, realizing the switching output of Hall and magnetoelectric speed signals. The central processing circuit collects the states of the speed signal type selection switch group and the control unit model selection switch group and selects different waveform parameters based on the different states of the switch groups, thereby outputting different speed control signals. The corresponding relationship between the control unit model and the control unit model selection switch group is shown in Table 1. Table 1 - Logical correspondence between speed analog signal and switch group status .

[0022] In a preferred embodiment of the present invention, the Hall-type speed analog signal generating circuit includes an op amp U11A, a capacitor C41, a capacitor C42, a resistor R117, a resistor R118, a resistor R123, a resistor R125 and a button S4, the non-inverting input end of the op amp U11A is respectively connected to one end of the resistor R118 and one end of the capacitor C42, the other end of the resistor R118 is connected to the speed signal type selection switch group, the other end of the capacitor C42 is grounded, and the inverting input end of the op amp U11A is respectively connected to the resistor R1 23 is connected to one end of resistor R125, the other end of resistor R123 is connected to a +5V power supply, the other end of resistor R125 is grounded, the positive power input of op amp U11A is connected to the +5V power supply, and the positive power input of op amp U11A is grounded via capacitor C41. The negative power input of op amp U11A is grounded. The output of op amp U11A is respectively connected to one end of resistor R117 and the speed signal type selection switch group, and the other end of resistor R117 is connected to the +5V power supply via button S4. In this embodiment, the 4-channel Hall-type speed analog signal generating circuit is used to receive the speed output control signal, i.e., the original PWM speed signal, from the central processing circuit, and amplify and shape the signal to ultimately output the required Hall-type speed analog signal, i.e., a square wave signal with missing or multiple teeth characteristics.

[0023] In a preferred embodiment of the present invention, the magnetoelectric speed analog signal generating circuit includes an op amp U9A, an op amp U9B, a resistor R103, a resistor R104, a resistor R115, a resistor R116, a resistor R121, a capacitor C39, a capacitor C40, a capacitor C43, a capacitor C45 and an optocoupler U10, the non-inverting input end of the op amp U9A is respectively connected to one end of the resistor R103 and one end of the resistor R104, the other end of the resistor R103 is grounded, and the other end of the resistor R104 is connected to a +12V power supply, the inverting input end of the op amp U9A is respectively connected to one end of the resistor R116 and one end of the capacitor C43, the other end of the resistor R116 is respectively connected to one end of the resistor R115 and the output pin 4 of the optocoupler U10, and the other end of the capacitor C43 is grounded. The other end of the resistor R115 is connected to the power supply +12V, the output pin 3 of the optocoupler U10 is grounded, the input pin 1 of the optocoupler U10 is connected to the power supply +5V, the input pin 1 of the optocoupler U10 is grounded through the capacitor C40, the input pin 2 of the optocoupler U10 is connected to the speed signal type selection switch group through the resistor R121, the positive power input terminal of the operational amplifier U9A is connected to the power supply +12V, the positive power input terminal of the operational amplifier U9A is grounded through the capacitor C39, the negative power input terminal of the operational amplifier U9A is connected to the power supply -12V, the negative power input terminal of the operational amplifier U9A is grounded through the capacitor C45, the output terminal of the operational amplifier U9A is connected to the speed signal type selection switch group, the non-inverting input terminal of the operational amplifier U9B is grounded, and the inverting input terminal of the operational amplifier U9B is connected to its output terminal. In this embodiment, the 4-channel magnetoelectric speed simulation signal generating circuit is used to receive the speed output control signal, i.e., the original sinusoidal speed signal, issued by the central processing circuit, and perform differential amplification on the signal, and finally output the required magnetoelectric speed simulation signal containing positive and negative voltage signals, i.e., a sinusoidal wave simulation signal with missing or multiple teeth characteristics.

[0024] In a preferred embodiment of the present invention, the power supply circuit includes an isolated power supply chip U5, an isolated power supply chip U6, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a resistor R42, a resistor R55, a resistor R69, a fuse F1, a diode D9 and a diode D10, the positive input end of the isolated power supply chip U5 is respectively connected to one end of the capacitor C19 and one end of the fuse F1, the negative input end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C19 and the ground, the isolated The positive output terminal VO+ of the isolated power chip U5 is respectively connected to one end of the capacitor C17, one end of the capacitor C18 and one end of the resistor R42. The common terminal of the isolated power chip U5 is respectively connected to the other end of the capacitor C17, the other end of the capacitor C18, the other end of the resistor R42, one end of the capacitor C21, one end of the capacitor C22 and one end of the resistor R55. The negative output terminal of the isolated power chip U5 is respectively connected to the other end of the capacitor C21, the other end of the capacitor C22 and the other end of the resistor R55. The positive input terminal of the isolated power chip U6 is respectively connected to one end of the capacitor C31, one end of the capacitor C33, one end of the capacitor C34 and one end of the fuse F1. The negative input terminal of the isolated power supply chip U6 is connected to the other end of the capacitor C31, the other end of the capacitor C33, the other end of the capacitor C34 and the ground, the other end of the fuse F1 is respectively connected to the cathode of the diode D9 and the cathode of the diode D10, the anode of the diode D9 is connected to +24V, and the anode of the diode D10 is grounded. The positive output terminal of the isolated power supply chip U6 is connected to one end of the capacitor C32, one end of the capacitor C35 and one end of the resistor R69, and the negative output terminal of the isolated power supply chip U6 is connected to the other end of the capacitor C32, the other end of the capacitor C35 and the other end of the resistor R69; the positive output terminal of the isolated power supply chip U5 is The power supply is +12V, the negative output terminal of the isolated power supply chip U5 is -12V, the common terminal of the isolated power supply chip U5 is analog ground, the positive output terminal of the isolated power supply chip U6 is +5V, and the negative output terminal of the isolated power supply chip U6 is digital ground. The power socket uses a sealed curved pin header -2EDGRC-5.08-2P terminal block, one end of which is connected to the power circuit and the other end is connected to the external +24V power supply. The speed signal output socket uses a double-row 8-pin curved pin header terminal block, one end of which is connected to the diesel engine control unit and the other end is connected to the 4-way speed signal type selection switch circuit. In this embodiment, the power socket serves as the physical interface between the external 24VDC power supply and the input of the power supply circuit. The power supply circuit is used to convert the external input 24VDC power voltage into +5VDC and ±12VDC voltages, and also provides the required power supply voltages for various circuits and chips (such as the Hall-effect speed analog signal generation circuit). The speed signal output socket is used to output a constant speed signal.

[0025] The advantages and beneficial effects of the present invention are as follows: (1) The output device of the diesel engine constant speed analog signal described in the present invention has strong versatility and extensibility. As long as the type and phase of the speed signal required by the control unit and the number of teeth and the number of missing teeth of the diesel engine speed signal gear are clearly defined, the speed signal control output software can be used to simulate and set the signal, thereby realizing the output of the crankshaft missing tooth speed analog signal, the cam multi-tooth speed analog signal, and the correct phase of the two. (2) The output device of the diesel engine speed analog signal of the present invention is easy to operate and can output the set speed analog signal by setting the switch group state according to the control unit model; (3) The output device of the diesel engine speed analog signal described in the present invention can output four speed analog signals separately and simultaneously; it has a wide range of applications and can meet the requirements of all current diesel engine control units for constant speed analog signals.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A diesel engine constant speed analog signal output device, characterized by: It includes a central processing circuit, a 4-channel Hall-type speed analog signal generating circuit, a 4-channel magnetoelectric speed analog signal generating circuit, a control unit model selection switch group, a speed signal type selection switch group, a power supply circuit, a power socket, a speed signal output socket and an output device PCB board; The control unit model selection switch group is connected to the central processing circuit, the central processing circuit is connected to the speed signal type selection switch group, the speed signal type selection switch group is respectively connected to the 4-way Hall-type speed analog signal generating circuit, the 4-way magnetoelectric speed analog signal generating circuit and the speed signal output socket, and the power supply circuit is connected to the power socket; The power supply circuit is respectively connected to the central processing circuit, the 4-way Hall-type speed analog signal generating circuit, the 4-way magnetoelectric speed analog signal generating circuit, the control unit model selection switch group and the speed signal type selection switch group; The central processing circuit, 4-channel Hall-type speed analog signal generating circuits, 4-channel magnetoelectric speed analog signal generating circuits, control unit model selection switch group, speed signal type selection switch group, power supply circuit, power socket and speed signal output socket are all installed and arranged on the output device PCB board.

2. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The central processing circuit is the MCU minimum application system, including an MCU, a clock circuit, a reset circuit, an MCU power circuit and an LED indicator circuit. The MCU is connected to the clock circuit, the reset circuit, the MCU power circuit and the LED indicator circuit respectively. The MCU includes 4 PWM output pins, 4 optocoupler on / off control pins and 4 switch status detection pins.

3. The diesel engine constant speed analog signal output device according to claim 2, characterized in that: The control unit model selection switch group includes four two-speed three-pin toggle switches, the middle pin of the two-speed three-pin toggle switch is connected to the switch status detection pin of the MCU, and the other two end pins of the two-speed three-pin toggle switch are respectively connected to the power supply +5V and ground.

4. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The Hall-type speed analog signal generating circuit includes an operational amplifier U11A, a capacitor C41, a capacitor C42, a resistor R117, a resistor R118, a resistor R123, a resistor R125 and a button S4. The non-inverting input end of the operational amplifier U11A is connected to one end of the resistor R118 and one end of the capacitor C42 respectively. The other end of the resistor R118 is connected to the speed signal type selection switch group. The other end of the capacitor C42 is grounded. The inverting input end of the operational amplifier U11A is connected to one end of the resistor R123 and one end of the resistor R125 respectively. 125, one end of the resistor R123 is connected to the +5V power supply, the other end of the resistor R125 is grounded, the positive power input terminal of the operational amplifier U11A is connected to the +5V power supply, and the positive power input terminal of the operational amplifier U11A is grounded through the capacitor C41, the negative power input terminal of the operational amplifier U11A is grounded, the output end of the operational amplifier U11A is respectively connected to one end of the resistor R117 and the speed signal type selection switch group, and the other end of the resistor R117 is connected to the power supply +5V through the button S4.

5. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The magnetoelectric speed analog signal generating circuit includes an operational amplifier U9A, an operational amplifier U9B, a resistor R103, a resistor R104, a resistor R115, a resistor R116, a resistor R121, a capacitor C39, a capacitor C40, a capacitor C43, a capacitor C45 and an optocoupler U10. The non-inverting input terminal of the operational amplifier U9A is respectively connected to one end of the resistor R103 and one end of the resistor R104, the other end of the resistor R103 is grounded, and the other end of the resistor R104 is connected to a +12V power supply. The inverting input terminal of the operational amplifier U9A is respectively connected to one end of the resistor R116 and one end of the capacitor C43, the other end of the resistor R116 is respectively connected to one end of the resistor R115 and the output pin 4 of the optocoupler U10, the other end of the capacitor C43 is grounded, and the The other end is connected to the power supply +12V, the output pin 3 of the optocoupler U10 is grounded, the input pin 1 of the optocoupler U10 is connected to the power supply +5V, the input pin 1 of the optocoupler U10 is grounded through the capacitor C40, the input pin 2 of the optocoupler U10 is connected to the speed signal type selection switch group through the resistor R121, the positive power input terminal of the op amp U9A is connected to the power supply +12V, the positive power input terminal of the op amp U9A is grounded through the capacitor C39, the negative power input terminal of the op amp U9A is connected to the power supply -12V, the negative power input terminal of the op amp U9A is grounded through the capacitor C45, the output terminal of the op amp U9A is connected to the speed signal type selection switch group, the non-inverting input terminal of the op amp U9B is grounded, and the inverting input terminal of the op amp U9B is connected to its output terminal.

6. A diesel engine constant speed analog signal output device according to claim 2, 4 or 5, characterized in that: The speed signal type selection switch group includes a 4-way speed signal type selection switch circuit, the speed signal type selection switch circuit includes an optocoupler U8, a relay K1, a two-speed three-pin switch K2, a resistor R105 and a capacitor C38, the input pin 1 of the optocoupler U8 is connected to the power supply +5V, and the input pin 1 of the optocoupler U8 is grounded through the capacitor C38, the input pin 2 of the optocoupler U8 is connected to the optocoupler on-off control pin of the MCU, the input pin 4 of the optocoupler U8 is connected to the power supply +5V, the input pin 3 of the optocoupler U8 is grounded through the coil of the relay K1, the moving contact 8 of the relay K1 is connected to the PWM output pin of the MCU, and the relay K 1 is connected to the speed signal output socket, the static contact 7 of the relay K1 is connected to the resistor R121 of the magnetoelectric speed analog signal generating circuit, the static contact 9 of the relay K1 is connected to the resistor R118 of the Hall type speed analog signal generating circuit, the static contact 4 of the relay K1 is connected to the output end of the operational amplifier U9A of the magnetoelectric speed analog signal generating circuit, the static contact 2 of the relay K1 is connected to the output end of the operational amplifier U11A of the Hall type speed analog signal generating circuit, the middle pin of the two-speed three-pin switch K2 is connected to the ground of the speed signal output socket, and the other two end pins of the two-speed three-pin switch K2 are respectively connected to the analog ground and the digital ground.

7. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The power supply circuit includes an isolated power supply chip U5, an isolated power supply chip U6, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a resistor R42, a resistor R55, a resistor R69, a fuse F1, a diode D9 and a diode D10. The positive input end of the isolated power supply chip U5 is respectively connected to one end of the capacitor C19 and one end of the fuse F1, the negative input end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C19 and the ground, the positive output end VO+ of the isolated power supply chip U5 is respectively connected to one end of the capacitor C17, one end of the capacitor C18 and one end of the resistor R42, and the common end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C17, the other end of the capacitor C18, the other end of the resistor R42, one end of the capacitor C21, one end of the capacitor C22 and One end of the resistor R55, the negative output end of the isolated power supply chip U5 is respectively connected to the other end of the capacitor C21, the other end of the capacitor C22 and the other end of the resistor R55, the positive input end of the isolated power supply chip U6 is respectively connected to one end of the capacitor C31, one end of the capacitor C33, one end of the capacitor C34 and one end of the fuse F1, the negative input end of the isolated power supply chip U6 is connected to the other end of the capacitor C31, the other end of the capacitor C33, the other end of the capacitor C34 and the ground, the other end of the fuse F1 is respectively connected to the cathode of the diode D9 and the cathode of the diode D10, the anode of the diode D9 is connected to +24V, and the anode of the diode D10 is grounded, the positive output end of the isolated power supply chip U6 is connected to one end of the capacitor C32, one end of the capacitor C35 and one end of the resistor R69, and the negative output end of the isolated power supply chip U6 is connected to the other end of the capacitor C32, the other end of the capacitor C35 and the other end of the resistor R69.

8. The diesel engine constant speed analog signal output device according to claim 7, characterized in that: The positive output end of the isolated power supply chip U5 is the power supply +12V, the negative output end of the isolated power supply chip U5 is the power supply -12V, the common end of the isolated power supply chip U5 is the analog ground, the positive output end of the isolated power supply chip U6 is the power supply +5V, and the negative output end of the isolated power supply chip U6 is the digital ground.

9. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The power socket adopts a sealed curved needle seat-2EDGRC-5.08-2P terminal block, one end of which is connected to the power circuit and the other end is connected to the external power supply +24V.

10. The diesel engine constant speed analog signal output device according to claim 1, characterized in that: The speed signal output socket adopts a double-row 8-core curved needle seat terminal, one end of which is connected to the diesel engine control unit and the other end is connected to the 4-way speed signal type selection switch circuit.

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