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Electronic Control Module Houston Truck Accident Lawyer

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

Attorney Reshard Alexander serving Houston and the Texas legal community since 2011.

An engine control unit (ECU), also commonly called an engine control module (ECM), is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. It does this by reading values from a multitude of sensors within the engine bay, interpreting the data using multidimensional performance maps (called lookup tables), and adjusting the engine actuators. Before ECUs, air-fuel mixture, ignition timing, and idle speed were mechanically set and dynamically controlled by mechanical and pneumatic means.

If the ECU has control over the fuel lines, then it is referred to as an electronic engine management system (EEMS). The fuel injection system has a major role to control the engine’s fuel supply. The whole mechanism of the EEMS is controlled by a stack of sensors and actuators.

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

Control of air-fuel ratio

Most modern engines use some type of fuel injection to deliver fuel to the cylinders. The ECU determines the amount of fuel to inject based on a number of sensor readings. Oxygen sensors tell the ECU whether the engine is running rich (too much fuel or too little oxygen) or running lean (too much oxygen or too little fuel) as compared to ideal conditions (known as stoichiometric). The throttle position sensor tells the ECU how far the throttle plate is opened when the accelerator (gas pedal) is pressed down. The mass airflow sensor measures the amount of air flowing into the engine through the throttle plate. The engine coolant temperature sensor measures whether the engine is warmed up or cool. If the engine is still cool, additional fuel will be injected.

Air–fuel mixture control of carburetors with computers is designed with a similar principle, but a mixture control solenoid or stepper motor is incorporated in the float bowl of the carburetor.

Control of idle speed

Most engine systems have idle speed control built into the ECU. The engine RPM is monitored by the crankshaft position sensor which plays a primary role in the engine timing functions for fuel injection, spark events, and valve timing. Idle speed is controlled by a programmable throttle stop or an idle air bypass control stepper motor. Early carburetor-based systems used a programmable throttle stop using a bidirectional DC motor. Early throttle body injection (TBI) systems used an idle air control stepper motor. Effective idle speed control must anticipate the engine load at idle.

A full authority throttle control system may be used to control idle speed, provide cruise control functions and top speed limitation. It also monitors the ECU section for reliability.

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

Control of variable valve timing

Some engines have variable valve timing. In such an engine, the ECU controls the time in the engine cycle at which the valves open. The valves are usually opened sooner at higher speeds than at lower speeds. This can increase the flow of air into the cylinder, increasing power and fuel economy.

Electronic valve control

Experimental engines have been made and tested that have no camshaft but have full electronic control of the intake and exhaust valve opening, valve closing and area of the valve opening.^[1] Such engines can be started and run without a starter motor for certain multi-cylinder engines equipped with precision timed electronic ignition and fuel injection. Such a static-start engine would provide the efficiency and pollution-reduction improvements of a mild hybrid-electric drive, but without the expense and complexity of an oversized starter motor.^[2]

The first production engine of this type was invented (in 2002) and introduced (in 2009) by Italian automaker Fiat in the Alfa Romeo MiTo. Their Multiair engines use electronic valve control which dramatically improves torque and horsepower while reducing fuel consumption as much as 15%. Basically, the valves are opened by hydraulic pumps, which are operated by the ECU. The valves can open several times per intake stroke, based on engine load. The ECU then decides how much fuel should be injected to optimize combustion.

At steady load conditions, the valve opens, fuel is injected, and the valve closes. Under a sudden increase in throttle, the valve opens in the same intake stroke and a greater amount of fuel is injected. This allows immediate acceleration. For the next stroke, the ECU calculates engine load at the new, higher RPM, and decides how to open the valve: early or late, wide-open or half-open. The optimal opening and timing are always reached and combustion is as precise as possible. This, of course, is impossible with a normal camshaft, which opens the valve for the whole intake period, and always to full lift.

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

The elimination of cams, lifters, rockers, and timing set reduces not only weight and bulk, but also friction. A significant portion of the power that an engine actually produces is used up just driving the valve train, compressing all those valve springs thousands of times a minute.

Once more fully developed, electronic valve operation will yield even more benefits. Cylinder deactivation, for instance, could be made much more fuel-efficient if the intake valve could be opened on every downstroke and the exhaust valve opened on every upstroke of the deactivated cylinder or “dead hole”. Another even more significant advancement will be the elimination of the conventional throttle. When a car is run at part throttle, this interruption in the airflow causes an excess vacuum, which causes the engine to use up valuable energy acting as a vacuum pump. BMW attempted to get around this on their V-10 powered M5, which had individual throttle butterflies for each cylinder, placed just before the intake valves. With electronic valve operation, it will be possible to control engine speed by regulating valve lift. At part throttle, when less air and gas are needed, the valve lift would not be as great. Full throttle is achieved when the gas pedal is depressed, sending an electronic signal to the ECU, which in turn regulates the lift of each valve event, and opens it all the way up.

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

Modern ECUs use a microprocessor that can process the inputs from the engine sensors in real-time. An electronic control unit contains the hardware and software (firmware). The hardware consists of electronic components on a printed circuit board (PCB), ceramic substrate or a thin laminate substrate. The main component on this circuit board is a microcontroller chip (MCU). The software is stored in the microcontroller or other chips on the PCB., typically in EPROMs or flash memory so the CPU can be re-programmed by uploading updated code or replacing chips. This is also referred to as an (electronic) Engine Management System (EMS).

Sophisticated engine management systems receive inputs from other sources, and control other parts of the engine; for instance, some variable valve timing systems are electronically controlled, and turbocharger waste gates can also be managed. They also may communicate with transmission control units or directly interface electronically controlled automatic transmissions, traction control systems, and the like. The Controller Area Network or CAN bus automotive network is often used to achieve communication between these devices.

Modern ECUs sometimes include features such as cruise control, transmission control, anti-skid brake control, and anti-theft control, etc.

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

General Motors‘ (GM) first ECUs had a small application of hybrid digital ECUs as a pilot program in 1979, but by 1980, all active programs were using microprocessor-based systems. Due to the large ramp-up of the volume of ECUs that were produced to meet the Clean Air Act requirements for 1981, only one ECU model could be built for the 1981 model year.^[6] The high volume ECU that was installed in GM vehicles from the first high volume year, 1981, onward was a modern microprocessor-based system. GM moved rapidly to replace carburation with fuel injection as the preferred method of fuel delivery for vehicles it manufactured. This process first saw fruition in 1980 with fuel-injected Cadillac engines, followed by the Pontiac 2.5L I4 “Iron Duke” and the Chevrolet 5.7L V8 L83 “Cross-Fire” engine powering the Chevrolet Corvette in 1982. The 1990 Cadillac Brougham powered by the Oldsmobile 5.0L V8 LV2 engine was the last carbureted passenger car manufactured for sale in the North American market (a 1992 Volkswagen Beetle model powered by a carbureted engine was available for purchase in Mexico but not offered for sale in the United States or Canada) and by 1991 GM was the last of the major US and Japanese automakers to abandon carburetion and manufacture all of its passenger cars exclusively with fuel-injected engines. In 1988 Delco (GM’s electronics division), had produced more than 28,000 ECUs per day, making it the world’s largest producer of on-board digital control computers at the time.^[7]

Electronic Control Module Houston Truck Accident Lawyer

Seeking a Free Consultation with one of Texas’ Houston Truck Accident Lawyers? Call the Big Rig Bull Texas Truck Accident Lawyer Reshard Alexander today at 713.766.3322.

It is advisable to consult a Houston truck accident attorney Reshard Alexander who will help determine liability and the right compensation amount that you should get for your injuries. The insurance company of the at-fault driver may not be willing to pay for damages and I can help you with the negotiation process. Call me today at (713) 766-3322 for a free consultation.

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